Information About iSCSI
Cisco MDS 9000 Family IP Storage (IPS) services extend the reach of Fibre Channel SANs by using open-standard, IP-based technology. The iSCSI feature consists of routing iSCSI requests and responses between iSCSI hosts in an IP network and Fibre Channel storage devices in the Fibre Channel SAN that are accessible from any Fibre Channel interface of the Cisco MDS 9000 Family switch. Using the iSCSI protocol, the iSCSI driver allows an iSCSI host to transport SCSI requests and responses over an IP network. To use the iSCSI feature, you must explicitly enable iSCSI on the required switches in the fabric.
Note The iSCSI feature is not supported on the Cisco Fabric Switch for HP c-Class Bladesystem and Cisco Fabric Switch for IBM BladeCenter.
The iSCSI feature consists of routing iSCSI requests and responses between iSCSI hosts in an IP network and Fibre Channel storage devices in the Fibre Channel SAN that are accessible from any Fibre Channel interface of the Cisco MDS 9000 Family switch (see Figure 40-1).
Figure 40-1 Transporting iSCSI Requests and Responses for Transparent iSCSI Routing
Each iSCSI host that requires access to storage through the IPS module or MPS-14/2 module needs to have a compatible iSCSI driver installed. Using the iSCSI protocol, the iSCSI driver allows an iSCSI host to transport SCSI requests and responses over an IP network. From the host operating system perspective, the iSCSI driver appears to be an SCSI transport driver similar to a Fibre Channel driver in the host.
The IPS module or MPS-14/2 module provides transparent SCSI routing. IP hosts using the iSCSI protocol can transparently access targets on the Fibre Channel network. It (see Figure 40-1) provides an example of a typical configuration of iSCSI hosts connected to an IPS module or MPS-14/2 module through the IP network access Fibre Channel storage on the Fibre Channel SAN.
The IPS module or MPS-14/2 module create a separate iSCSI SAN view and Fibre Channel SAN view. For the iSCSI SAN view, the IPS module or MPS-14/2 module creates iSCSI virtual targets and then maps them to physical Fibre Channel targets available in the Fibre Channel SAN. They present the Fibre Channel targets to IP hosts as if the physical iSCSI targets were attached to the IP network (see Figure 40-2).
Figure 40-2 iSCSI SAN View—iSCSI Virtual Targets
For the Fibre Channel SAN view, the IPS module or MPS-14/2 module presents iSCSI hosts as a virtual Fibre Channel host. The storage devices communicate with the virtual Fibre Channel host similar to communications performed with real Fibre Channel hosts (see Figure 40-3).
Figure 40-3 Fibre Channel SAN View—iSCSHI Host as an HBA
The IPS modules or MPS-14/2 modules transparently map the command between the iSCSI virtual target and the virtual Fibre Channel host (see Figure 40-4).
Figure 40-4 iSCSI to FCP (Fibre Channel) Routing
Routing SCSI from the IP host to the Fibre Channel storage device consists of the following main actions:
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The iSCSI requests and responses are transported over an IP network between the hosts and the IPS module or MPS-14/2 module.
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The SCSI requests and responses are routed between the hosts on an IP network and the Fibre Channel storage device (converting iSCSI to FCP and vice versa). The IPS module or MPS-14/2 module performs this conversion and routing.
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The FCP requests or responses are transported between the IPS module or MPS-14/2 module and the Fibre Channel storage devices.
Note FCP (the Fibre Channel equivalent of iSCSI) carries SCSI commands over a Fibre Channel SAN.
Refer to the IETF standards for IP storage at http://www.ietf.org for information on the iSCSI protocol.
About iSCSI Configuration Limits
iSCSI configuration has the following limits:
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The maximum number of iSCSI and iSLB initiators supported in a fabric is 2000.
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The maximum number of iSCSI and iSLB initiators supported is 200 per port.
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The maximum number of iSCSI and iSLB sessions supported by an IPS port in either transparent or proxy initiator mode is 500.
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The maximum number of iSCSI and iSLB session support by switch is 5000.
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The maximum number of iSCSI and iSLB targets supported in a fabric is 6000.
Presenting Fibre Channel Targets as iSCSI Targets
The IPS module or MPS-14/2 module presents physical Fibre Channel targets as iSCSI virtual targets, allowing them to be accessed by iSCSI hosts. The module presents these targets in one of the two ways:
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Dynamic mapping—Automatically maps all the Fibre Channel target devices/ports as iSCSI devices. Use this mapping to create automatic iSCSI target names.
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Static mapping—Manually creates iSCSI target devices and maps them to the whole Fibre Channel target port or a subset of Fibre Channel LUNs. With this mapping, you must specify unique iSCSI target names.
Static mapping should be used when iSCSI hosts should be restricted to subsets of LUs in the Fibre Channel targets and/or iSCSI access control is needed (see the “iSCSI Access Control” section). Also, static mapping allows the configuration of transparent failover if the LUs of the Fibre Channel targets are reachable by redundant Fibre Channel ports (see the “Transparent Target Failover” section).
Note The IPS module or MPS-14/2 module does not import Fibre Channel targets to iSCSI by default. Either dynamic or static mapping must be configured before the IPS module or MPS-14/2 module makes Fibre Channel targets available to iSCSI initiators.
Dynamic Mapping
When you configure dynamic mapping the IPS module or MPS-14/2 module imports all Fibre Channel targets to the iSCSI domain and maps each physical Fibre Channel target port as one iSCSI target. That is, all LUs accessible through the physical storage target port are available as iSCSI LUs with the same LU number (LUN) as in the physical Fibre Channel target port.
The iSCSI target node name is created automatically using the iSCSI qualified name (IQN) format. The iSCSI qualified name is restricted to a maximum name length of 223 alphanumeric characters and a minimum length of 16 characters.
The IPS module or MPS-14/2 module creates an IQN formatted iSCSI target node name using the following conventions because the name must be unique in the SAN:
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IPS Gigabit Ethernet ports that are not part of a Virtual Router Redundancy Protocol (VRRP) group or PortChannel use this format:
iqn.1987-05.com.cisco:05.<mgmt-ip-address>.<slot#>-<port#>-<sub-intf#>.<Target-pWWN>
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IPS ports that are part of a VRRP group use this format:
iqn.1987-05.com.cisco:05.vrrp-<vrrp-ID#>-<vrrp-IP-addr>.<Target-pWWN>
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Ports that are part of a PortChannel use this format:
iqn.1987-02.com.cisco:02.<mgmt-ip-address>.pc-<port-ch-sub-intf#>.<Target-pWWN>
Note If you have configured a switch name, then the switch name is used instead of the management IP address. If you have not configured a switch name, the management IP address is used.
With this convention, each IPS port in a Cisco MDS 9000 Family switch creates a unique iSCSI target node name for the same Fibre Channel target port in the SAN.
For example, if an iSCSI target was created for a Fibre Channel target port with pWWN 31:00:11:22:33:44:55:66 and that pWWN contains LUN 0, LUN 1, and LUN 2, those LUNs would become available to an IP host through the iSCSI target node name iqn.1987-05.com.cisco:05.
MDS_switch_management_IP_address
.01-01.3100112233445566 (see Figure 40-5).
Figure 40-5 Dynamic Target Mapping
Note Each iSCSI initiator may not have access to all targets depending on the configured access control mechanisms (see the “iSCSI Access Control” section).
Static Mapping
You can manually (statically) create an iSCSI target by assigning a user-defined unique iSCSI node name to it. The iSCSI qualified name is restricted to a minimum length of 16 characters and a maximum of 223 characters. A statically mapped iSCSI target can either map the whole Fibre Channel target port (all LUNs in the target port mapped to the iSCSI target), or it can contain one or more LUs from a Fibre Channel target port (see Figure 40-6).
Figure 40-6 Statically Mapped iSCSI Targets
Presenting iSCSI Hosts as Virtual Fibre Channel Hosts
The IPS module or MPS-14/2 module connects to the Fibre Channel storage devices on behalf of the iSCSI host to send commands and transfer data to and from the storage devices. These modules use a virtual Fibre Channel N port to access the Fibre Channel storage devices on behalf of the iSCSI host. iSCSI hosts are identified by either iSCSI qualified name (IQN) or IP address.
Initiator Identification
iSCSI hosts can be identified by the IPS module or MPS-14/2 module using the following:
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iSCSI qualified name (IQN)
An iSCSI initiator is identified based on the iSCSI node name it provides in the iSCSI login. This mode can be useful if an iSCSI host has multiple IP addresses and you want to provide the same service independent of the IP address used by the host. An initiator with multiple IP addresses (multiple network interface cards—NICs) has one virtual N port on each IPS port to which it logs in.
An iSCSI initiator is identified based on the IP address of the iSCSI host. This mode is useful if an iSCSI host has multiple IP addresses and you want to provide different service-based on the IP address used by the host. It is also easier to get the IP address of a host compared to getting the iSCSI node name. A virtual N port is created for each IP address it uses to log in to iSCSI targets. If the host using one IP address logs in to multiple IPS ports, each IPS port will create one virtual N port for that IP address.
Initiator Presentation Modes
Two modes are available to present iSCSI hosts in the Fibre Channel fabric: transparent initiator mode and proxy initiator mode.
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In transparent initiator mode, each iSCSI host is presented as one virtual Fibre Channel host. The benefit of transparent mode is it allows a finer level of Fibre Channel access control configuration (similar to managing a “real” Fibre Channel host). Because of the one-to-one mapping from iSCSI to Fibre Channel, each host can have different zoning or LUN access control on the Fibre Channel storage device.
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In proxy initiator mode, there is only one virtual Fibre Channel host per one IPS port and all iSCSI hosts use that to access Fibre Channel targets. In a scenario where the Fibre Channel storage device requires explicit LUN access control for every host, the static configuration for each iSCSI initiator can be overwhelming. In this case, using the proxy initiator mode simplifies the configuration.
The Cisco MDS switches support the following iSCSI session limits:
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The maximum number of iSCSI sessions on a switch is 5000.
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The maximum number of iSCSI sessions per IPS port in transparent initiator mode is 500.
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The maximum number of iSCSI sessions per IPS port in proxy initiator mode is 500.
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The maximum number of concurrent sessions an IPS port can create is five (but the total number of sessions that can be supported is 500).
Note If more than five iSCSI sessions try to come up simultaneously on a port, the initiator receives a temporary error and later retries to create a session.
Transparent Initiator Mode
Each iSCSI host is presented as one virtual Fibre Channel host (that is, one Fibre Channel N port). The benefit of transparent mode is it allows a finer-level of Fibre Channel access control configuration. Because of the one-to-one mapping from iSCSI to Fibre Channel, each host can have different zoning or LUN access control on the Fibre Channel storage device.
When an iSCSI host connects to the IPS module or MPS-14/2 module, a virtual host N port (HBA port) is created for the host (see Figure 40-7). Every Fibre Channel N port requires a unique Node WWN and Port WWN.
Figure 40-7 Virtual Host HBA Port
After the virtual N port is created with the WWNs, a fabric login (FLOGI) is done through the virtual iSCSI interface of the IPS port. After the FLOGI is completed, the virtual N port is online in the Fibre Channel SAN and virtual N port is registered in the Fibre Channel name server. The IPS module or MPS-14/2 module registers the following entries in the Fibre Channel name server:
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IP address of the iSCSI host in the IP-address field on the name server
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IQN of the iSCSI host in the symbolic-node-name field of the name server
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SCSI_FCP in the FC-4 type field of the name server
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Initiator flag in the FC-4 feature of the name server
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Vendor-specific iSCSI GW flag in the FC-4 type field to identify the N-port device as an iSCSI gateway device in the name server.
When all the iSCSI sessions from the iSCSI host are terminated, the IPS modules or MPS-14/2 modules perform an explicit Fabric logout (FLOGO) to remove the virtual N-port device from the Fibre Channel SAN (this indirectly de-registers the device from the Fibre Channel name server).
For every iSCSI session from the host to the iSCSI virtual target there is a corresponding Fibre Channel session to the real Fibre Channel target. There are three iSCSI hosts (see Figure 40-7), and all three of them connect to the same Fibre Channel target. There is one Fibre Channel session from each of the three virtual Fibre Channel hosts to the target.
WWN Assignment for iSCSI Initiators
An iSCSI host is mapped to an N port’s WWNs by one of the following mechanisms:
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Dynamic mapping (default)
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Static mapping
Dynamic Mapping
With dynamic mapping, an iSCSI host is mapped to a dynamically generated port WWN (pWWN) and node WWN (nWWN). Each time the iSCSI host connects it might be mapped to a different WWN. Use this option if no access control is required on the Fibre Channel target device (because the target device access control is usually configured using the host WWN).
The WWNs are allocated from the MDS switch's WWN pool. The WWN mapping to the iSCSI host is maintained as long as the iSCSI host has at least one iSCSI session to the IPS port. When all iSCSI sessions from the host are terminated and the IPS module or MPS-14/2 module performs an FLOGO for the virtual N port of the host, the WWNs are released back to the switch's Fibre Channel WWN pool. These addresses are then available for assignment to other iSCSI hosts requiring access to the Fibre Channel Fabric.
The following are three dynamic initiator modes are supported:
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iSCSI—Dynamic initiators are treated as iSCSI initiators and can access dynamic virtual targets and configured iSCSI virtual targets.
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iSLB—Dynamic initiators are treated as iSLB initiators.
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Deny—Dynamic initiators are not allowed to log in to the MDS switch.
iSCSI dynamic mapping is the default mode of operation. This configuration is distributed using CFS.
Note Configuring dynamic initiator modes is supported only through the CLI, not through Device Manager or Cisco DCNM for SAN.
Static Mapping
With static mapping, an iSCSI host is mapped to a specific pWWN and nWWN. This mapping is maintained in persistent storage and each time the iSCSI host connects, the same WWN mapping is used. This mode is required if you use access control on the target device.
You can implement static mapping in one of two ways:
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User assignment—You can specify your own unique WWN by providing them during the configuration process.
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System assignment—You can request that the switch provide a WWN from the switch’s Fibre Channel WWN pool and keep the mapping in its configuration.
Tip We recommend using the system-assign option. If you manually assign a WWN, you must ensure its uniqueness (see the Fabric Configuration Guide, Cisco DCNM for SANCisco MDS 9000 Family NX-OS Fabric Configuration Guide for more information). You should not use any previously assigned WWNs.
Proxy Initiator Mode
In the event that the Fibre Channel storage device requires explicit LUN access control for every host use the transparent initiator mode (presenting one iSCSI host as one Fibre Channel host). Every iSCSI host has to be configured statically. This can mean several configuration tasks for each iSCSI host. If you do not need explicit LUN access control, using the proxy initiator mode simplifies the configuration.
In this mode, only one virtual host N port (HBA port) is created per IPS port. All the iSCSI hosts connecting to that IPS port will be multiplexed using the same virtual host N port (see Figure 40-8). This mode simplifies the task of statically binding WWNs. LUN mapping and assignment on the Fibre Channel storage array must be configured to allow access from the proxy virtual N port’s pWWN for all LUNs used by each iSCSI initiator that connects through this IPS port. The LUN is then assigned to each iSCSI initiator by configuring iSCSI virtual targets (see the “Static Mapping” section) with LUN mapping and iSCSI access control (see the “iSCSI Access Control” section).
Figure 40-8 Multiplexing IPS Ports
Proxy initiator mode can be configured on a per IPS port basis, in which case only iSCSI initiators terminating on that IPS port will be in this mode.
When an IPS port is configured in proxy-initiator mode, fabric login (FLOGI) is done through the virtual iSCSI interface of the IPS port. After the FLOGI is completed, the proxy-initiator virtual N port is online in the Fibre Channel fabric and virtual N port is registered in the Fibre Channel name server. The IPS module or MPS-14/2 module registers the following entries in the Fibre Channel name server:
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iSCSI interface name iSCSI slot /port is registered in the symbolic-node-name field of the name server
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SCSI_FCP in the FC-4 type field of the name server
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Initiator flag in the FC-4 feature of the name server
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Vendor specific flag (iscsi-gw) in the FC-4 type field to identify the N-port device as an iSCSI gateway device in the name server
Similar to transparent initiator mode, the user can provide a pWWN and nWWN or request a system assigned WWN for the proxy initiator N port.
VSAN Membership for iSCSI
VSAN membership can be configured for an iSCSI interface, called the port
VSAN. All the iSCSI devices that connect to this interface automatically become members of this VSAN, if it is not explicitly configured in a VSAN. The default port VSAN of an iSCSI interface is VSAN 1. Similar to Fibre Channel devices, iSCSI devices have two mechanisms by which VSAN membership can be defined.
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iSCSI host—VSAN membership to iSCSI host. (This method takes precedent over the iSCSI interface).
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iSCSI interface—VSAN membership to iSCSI interface. (All iSCSI hosts connecting to this iSCSI interface inherit the interface VSAN membership if the host is not configured in any VSAN by the iSCSI host method).
Advanced VSAN Membership for iSCSI Hosts
An iSCSI host can be a member of multiple VSANs. In this case, multiple virtual Fibre Channel hosts are created, one in each VSAN in which the iSCSI host is a member. This configuration is useful when certain resources such as Fibre Channel tape devices need to be shared among different VSANs.
iSCSI Access Control
Two methods of access control are available for iSCSI devices. Depending on the initiator mode used to present the iSCSI hosts in the Fibre Channel fabric, either or both of the access control methods can be used.
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Fiber Channel zoning-based access control—Fibre Channel zoning has been extended to support iSCSI devices, and this extension has the advantage of having a uniform, flexible access control mechanism across the whole SAN. In the case of iSCSI, multiple iSCSI devices may be connected behind an iSCSI interface. Interface-based zoning may not be useful because all iSCSI devices behind the interface will automatically be within the same zone.
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iSCSI ACL-based access control—iSCSI-based access control is applicable only if static iSCSI virtual targets are created. For a static iSCSI target, you can configure a list of iSCSI initiators that are allowed to access the targets. By default, static iSCSI virtual targets are not accessible to any iSCSI host.
Depending on the initiator mode used to present the iSCSI hosts in the Fibre Channel fabric, either or both the access control mechanisms can be used.
The following topics are included in this section:
Fibre Channel Zoning-Based Access Control
Cisco SAN-OS Release 3.x and NX-OS Release 4.1(1b) VSAN and zoning concepts have been extended to cover both Fibre Channel devices and iSCSI devices. Zoning is the standard access control mechanism for Fibre Channel devices, which is applied within the context of a VSAN. Fibre Channel zoning has been extended to support iSCSI devices, and this extension has the advantage of having a uniform, flexible access control mechanism across the whole SAN.
Common mechanisms for identifying members of a Fibre Channel zone are the following:
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Fibre Channel device pWWN.
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Interface and switch WWN. Device connecting via that interface is within the zone.
See the Fabric Configuration Guide,Cisco DCNM for SANCisco MDS 9000 Family NX-OS Fabric Configuration Guide for details on Fibre Channel zoning.
In the case of iSCSI, multiple iSCSI devices may be connected behind an iSCSI interface. Interface-based zoning may not be useful because all the iSCSI devices behind the interface will automatically be within the same zone.
In transparent initiator mode (where one Fibre Channel virtual N port is created for each iSCSI host as described in the “Transparent Initiator Mode” section), if an iSCSI host has static WWN mapping then the standard Fibre Channel device pWWN-based zoning membership mechanism can be used.
Zoning membership mechanism has been enhanced to add iSCSI devices to zones based on the following:
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IPv4 address/subnet mask
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IPv6 address/prefix length
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iSCSI qualified name (IQN)
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Symbolic-node-name (IQN)
For iSCSI hosts that do not have a static WWN mapping, the feature allows the IP address or iSCSI node name to be specified as zone members. Note that iSCSI hosts that have static WWN mapping can also use these features. IP address based zone membership allows multiple devices to be specified in one command by providing the subnet mask.
Note In proxy initiator mode, all iSCSI devices connecting to an IPS port gain access to the Fibre Channel fabric through a single virtual Fibre Channel N port. Zoning based on the iSCSI node name or IP address will not have any effect. If zoning based on pWWN is used, then all iSCSI devices connecting to that IPS port will be put in the same zone. To implement individual initiator access control in proxy initiator mode, configure an iSCSI ACL on the virtual target (see the “iSCSI-Based Access Control” section).
iSCSI-Based Access Control
iSCSI-based access control is applicable only if static iSCSI virtual targets are created (see the “Static Mapping” section). For a static iSCSI target, you can configure a list of iSCSI initiators that are allowed to access the targets.
By default, static iSCSI virtual targets are not accessible to any iSCSI host. You must explicitly configure accessibility to allow an iSCSI virtual target to be accessed by all hosts. The initiator access list can contain one or more initiators. The iSCSI initiator can be identified by one of the following mechanisms:
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iSCSI node name
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IPv4 address and subnet
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IPv6 address
Note For a transparent mode iSCSI initiator, if both Fibre Channel zoning and iSCSI ACLs are used, then for every static iSCSI target that is accessible to the iSCSI host, the initiator’s virtual N port should be in the same Fibre Channel zone as the Fibre Channel target.
Enforcing Access Control
IPS modules and MPS-14/2 modules use both iSCSI and Fibre Channel zoning-based access control lists to enforce access control. Access control is enforced both during the iSCSI discovery phase and the iSCSI session creation phase. Access control enforcement is not required during the I/O phase because the IPS module or MPS-14/2 module is responsible for the routing of iSCSI traffic to Fibre Channel.
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iSCSI discovery phase—When an iSCSI host creates an iSCSI discovery session and queries for all iSCSI targets, the IPS module or MPS-14/2 module returns only the list of iSCSI targets this iSCSI host is allowed to access based on the access control policies discussed in the previous section. The IPS module or MPS-14/2 module does this by querying the Fibre Channel name server for all the devices in the same zone as the initiator in all VSANs. It then filters out the devices that are initiators by looking at the FC4-feature field of the FCNS entry. (If a device does not register as either initiator or target in the FC4-feature field, the IPS module or MPS-14/2 module will advertise it). It then responds to the iSCSI host with the list of targets. Each will have either a static iSCSI target name that you configure or a dynamic iSCSI target name that the IPS module or MPS-14/2 module creates for it (see the “Dynamic Mapping” section).
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iSCSI session creation—When an IP host initiates an iSCSI session, the IPS module or MPS-14/2 module verifies if the specified iSCSI target (in the session login request) is allowed by both the access control mechanisms described in the “iSCSI-Based Access Control” section.
If the iSCSI target is a static mapped target, the IPS module or MPS-14/2 module verifies if the iSCSI host is allowed within the access list of the iSCSI target. If the IP host does not have access, its login is rejected. If the iSCSI host is allowed, it validates if the virtual Fibre Channel N port used by the iSCSI host and the Fibre Channel target mapped to the static iSCSI virtual target are in the same Fibre Channel zone.
If the iSCSI target is an autogenerated iSCSI target, then the IPS module or MPS-14/2 module extracts the WWN of the Fibre Channel target from the iSCSI target name and verifies if the initiator and the Fibre Channel target is in the same Fibre Channel zone or not. If they are, then access is allowed.
The IPS module or MPS-14/2 module uses the Fibre Channel virtual N port of the iSCSI host and does a zone-enforced name server query for the Fibre Channel target WWN. If the FC ID is returned by the name server, then the iSCSI session is accepted. Otherwise, the login request is rejected.
iSCSI Session Authentication
The IPS module or MPS-14/2 module supports the iSCSI authentication mechanism to authenticate the iSCSI hosts that request access to the storage devices. By default, the IPS modules or MPS-14/2 modules allow CHAP or None authentication of iSCSI initiators. If authentication is always used, you must configure the switch to allow only CHAP authentication.
For CHAP user name or secret validation, you can use any method supported and allowed by the Cisco MDS AAA infrastructure. AAA authentication supports a RADIUS, TACACS+, or local authentication device. See the Security Configuration Guide, Cisco DCNM for SAN.
The
aaa authentication iscsi
command enables AAA authentication for the iSCSI host and specifies the method to use. See Cisco MDS 9000 Family NX-OS Security Configuration Guide.
iSCSI Immediate Data and Unsolicited Data Features
Cisco MDS switches support the iSCSI immediate data and unsolicited data features if requested by the initiator during the login negotiation phase. Immediate data is iSCSI write data contained in the data segment of an iSCSI command protocol data unit (PDU), such as combining the write command and write data together in one PDU. Unsolicited data is iSCSI write data that an initiator sends to the iSCSI target, such as an MDS switch, in an iSCSI data-out PDU without having to receive an explicit ready to transfer (R2T) PDU from the target.
These two features help reduce I/O time for small write commands because it removes one round-trip between the initiator and the target for the R2T PDU. As an iSCSI target, the MDS switch allows up to 64 KB of unsolicited data per command. This is controlled by the FirstBurstLength parameter during iSCSI login negotiation phase.
If an iSCSI initiator supports immediate data and unsolicited data features, these features are automatically enabled on the MDS switch with no configuration required.
Cisco MDS switches support the following advanced features for iSCSI interfaces:
iSCSI Listener Port
You can configure the TCP port number for the iSCSI interface that listens for new TCP connections. The default port number is 3260. Once you change the TCP port number, the iSCSI port only accepts TCP connections on the newly configured port.
TCP Tuning Parameters
You can configure the following TCP parameters:
iSCSI Routing Modes
Cisco MDS 9000 Family switches support multiple iSCSI routing modes. Each mode negotiates different operational parameters, has different advantages and disadvantages, and is suitable for different usages.
In pass-thru mode, the port on the IPS module or MPS 14/2 module converts and forwards read data frames from the Fibre Channel target to the iSCSI host frame-by-frame without buffering. This means that one data-in frame received is immediately sent out as one iSCSI data-in PDU.
In the opposite direction, the port on the IPS module or MPS 14/2 module limits the maximum size of iSCSI write data-out PDU that the iSCSI host can send to the maximum data size that the Fibre Channel target specifies that it can receive. The result is one iSCSI data-out PDU received sent out as one Fibre Channel data frame to the Fibre Channel target.
The absence of buffering in both directions leads to an advantage of lower forwarding latency. However, a small maximum data segment length usually results in lower data transfer performance from the host because of a higher processing overhead by the host system. Another benefit of this mode is iSCSI data digest can be enabled. This helps protect the integrity of iSCSI data carried in the PDU over what TCP checksum offers.
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Store-and-forward mode (default)
In store-and-forward mode, the port on the IPS module or MPS 14/2 module assembles all the Fibre Channel data frames of an exchange to build one large iSCSI data-in PDU before forwarding it to the iSCSI client.
In the opposite direction, the port on the IPS module or MPS 14/2 module does not impose a small data segment size on the host so the iSCSI host can send an iSCSI data-out PDU of any size (up to 256 KB). The port then waits until the whole iSCSI data-out PDU is received before it converts, or splits, the PDU, and forwards Fibre Channel frames to the Fibre Channel target.
The advantage of this mode is higher data transfer performance from the host. The disadvantages are higher transfer latency and that the iSCSI data digest (CRC) cannot be used.
Note The store-and-forward mode is the default forwarding mode.
Cut-through mode improves the read operation performance over store-and-forward mode. The port on the IPS module or MPS 14/2 module achieves this by forwarding each Fibre Channel data-in frame to the iSCSI host as it is received without waiting for the whole exchange complete. There is no difference for write data-out operations from store-and-forward mode.
Figure 40-9 compares the messages exchanged by the iSCSI routing modes.
Figure 40-9 iSCSI Routing Modes
Table 40-1
compares the advantages and disadvantages of the different iSCSI routing modes.
Table 40-1 Comparison of iSCSI Routing Modes
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|
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Pass-thru
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Low-latency
Data digest can be used
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Lower data transfer performance.
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Store-and-forward
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Higher data transfer performance
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Data digest cannot be used.
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Cut-thru
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Improved read performance over store-and-forward
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If the Fibre Channel target sent read data for different commands interchangeably, data of the first command is forwarded in cut-thru mode but the data of subsequent commands is buffered and the behavior is the same as store-and-forward mode.
Data digest cannot be used.
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About iSLB
The iSCSI server load balancing (iSLB) feature provides a means to easily configure large scale iSCSI deployments containing hundreds or even thousands of initiators. iSLB provides the following features:
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The iSLB initiator configuration is simplified with support for initiator targets and auto-zones.
-
Cisco Fabric Services (CFS) eliminates the need for manual configuration by distributing the iSLB initiator configuration among all MDS switches in the fabric.
-
Dynamic load balancing of iSLB initiators is available using iSCSI login redirect and VRRP.
When not using iSLB, configuring iSCSI requires the following:
-
You need to perform multiple configuration steps on the MDS switch, including the following:
– Initiator configuration using static pWWN and VSAN.
– Zoning configuration for initiators and targets.
– Optional create virtual target and give access to the initiator.
– Configuration of target LUN mapping and masking on the storage system for the initiator based on the static pWWN created for the initiator on the MDS switch.
-
You need to duplicate the configuration manually on multiple MDS switches.
-
There is no load balancing for IPS ports. For example:
– The Virtual Router Redundancy Protocol (VRRP) only supports active and backup, not load balancing.
– You must use multiple VRRP groups and configure hosts in different groups.
iSLB provides the following features:
-
The iSLB initiator configuration is simplified with support for initiator targets and auto-zones.
-
Cisco Fabric Services (CFS) eliminates the need for manual configuration by distributing the iSLB initiator configuration among all MDS switches in the fabric.
Note Only statically mapped iSLB initiator configuration is distributed throughout the fabric using CFS. Dynamically and statically mapped iSCSI initiator configurations are not distributed.
-
Dynamic load balancing of iSLB initiators is available using iSCSI login redirect and VRRP.
About iSLB Initiators
iSLB initiators provide the following features in addition to those supported by iSCSI initiators:
-
An iSLB initiator also supports iSLB virtual targets.
-
Initiator targets—These targets are configured for a particular initiator.
-
Load balancing using iSCSI login redirect and VRRP—If iSCSI login redirect is enabled, the IPS Manager redirects incoming sessions to the best interface based on the calculated load for each interface.
-
Configuration distribution to other switches using CFS.
iSLB initiators provide the following features in addition to those supported by iSCSI initiators:
-
An iSLB initiator also supports iSLB virtual targets. These targets are very similar to iSCSI virtual targets with the exception that they do not include the advertise interface option and as a result are distributable using CFS.
-
Initiator targets—These targets are configured for a particular initiator.
-
Load balancing using iSCSI login redirect and VRRP—If load balancing is enabled, the IPS Manager redirects incoming sessions to the best interface based on the calculated load for each interface.
-
Configuration distribution to other switches using CFS.
Assigning WWNs to iSLB Initiators
An iSLB host is mapped to an N port’s WWNs by one of the following mechanisms:
-
Dynamic mapping (default)
-
Static mapping
Note Assigning WWNs for iSLB initiators is the same as for iSCSI initiators. For information on dynamic and static mapping, see the “WWN Assignment for iSCSI Initiators” section.
Tip We recommend using the SystemAssign system-assign option. If you manually assign a WWN, you must ensure its uniqueness (see the Fabric Configuration Guide, Cisco DCNM for SANCisco MDS 9000 Family NX-OS Fabric Configuration Guide for more information). You should not use any previously assigned WWNs.
See the Configuring iSLB Using Device Manager.
iSLB Initiator Targets
You can configure initiator targets using the device alias or the pWWN. You can also optionally specify one or more of the following optional parameters:
-
Secondary pWWN
-
Secondary device alias
-
LUN mapping
-
IQN
-
VSAN identifier
Note The VSAN identifier is optional if the target is online. If the target is not online, the VSAN identifier is required.
In addition, you can disable auto-zoning.
If you configure an IQN for an initiator target, then that name is used to identify the initiator target. Otherwise, a unique IQN is generated for the initiator target.
iSLB Session Authentication
The IPS module and MPS-14/2 module support the iSLB authentication mechanism to authenticate iSLB hosts that request access to storage. By default, the IPS module and MPS-14/2 module allow CHAP or None authentication of iSCSI initiators. If authentication is always used, you must configure the switch to allow only CHAP authentication.
For CHAP user name or secret validation you can use any method supported and allowed by the Cisco MDS AAA infrastructure (see the Security Configuration Guide, Cisco DCNM for SANCisco MDS 9000 Family NX-OS Security Configuration Guide for more information). AAA authentication supports RADIUS, TACACS+, or a local authentication device.
Note Specifying the iSLB session authentication is the same as for iSCSI. See the “iSCSI Session Authentication” section.
About Load Balancing Using VRRP
You can configure Virtual Router Redundancy Protocol (VRRP) load balancing for iSLB. The host is configured with a VRRP address as the portal address. When the VRRP master port receives the first iSCSI session from an initiator, it assigns a backup port to serve that particular host. The information is synchronized to all switches through CFS if recovery is needed when a master port fails. The initiator gets a temporary redirect iSCSI login response. The host then logs in to the backup port at its physical IP address. All iSCSI interfaces in a VRRP group that has load balancing enabled must have the same interface VSAN, authentication, proxy initiator mode, and forwarding mode.
You can configure Virtual Router Redundancy Protocol (VRRP) load balancing for iSLB.
Figure 40-10 shows an example of load balancing using iSLB.
Figure 40-10 iSLB Initiator Load Balancing Example
The host is configured with a VRRP address as the portal address. When the VRRP master port receives the first iSCSI session from an initiator, it assigns a backup port to serve that particular host. This information is synchronized to all switches through CFS if recovery is needed when a master port fails. The initiator gets a temporary redirect iSCSI login response. The host then logs in to the backup port at its physical IP address. If the backup port goes down, the host will revert to the master port. The master port knows through CFS that the backup port has gone down and redirects the host to another backup port.
Note If an Ethernet PortChannel is configured between the IPS module and an Ethernet switch, the load balancing policy on the Ethernet switch must be based on source/destination IP address only, not port numbers, for load balancing with VRRP to operate correctly.
Note An initiator can also be redirected to the physical IP address of the master interface.
Tip iSLB VRRP load balancing is based on the number of iSLB initiators and not number of sessions. Any iSLB initiator that has more targets configured than the other iSLB initiators (resulting in more sessions) should be configured with a higher load metric. For example, you can increase the load metric of the iSLB initiator with more targets to 3000 from the default value of 1000.
Caution A Gigabit Ethernet interface configured for iSLB can only be in one VRRP group because redirected sessions do not carry information about the VRRP IP address or group. This restriction allows the slave backup port to uniquely identify the VRRP group to which it belongs.
Changing iSCSI Interface Parameters and the Impact on Load Balancing
All iSCSI interfaces in a VRRP group that has load balancing enabled must have the same interface VSAN, authentication, proxy initiator mode, and forwarding mode. When you need to change any of these parameters for the iSCSI interfaces in a VRRP group, you must do so one interface at a time. During the transition time when the parameter is changed on some interfaces in the VRRP group and not the others, the master port does not redirect new initiators and instead handles them locally.
Caution Changing the VSAN, proxy initiator, authentication, and forwarding mode for iSCSI interfaces in a VRRP group can cause sessions to go down multiple times.
VRRP Load Balancing Algorithm For Selecting Gigabit Ethernet Interfaces
When the VRRP master receives an iSCSI session request from an initiator, it first checks for an existing mapping to one of the interfaces in that VRRP group. If such a mapping exists, the VRRP master redirects the initiator to that interface. If no such mapping exists, the VRRP master selects the least loaded interface and updates the selected interface’s load with the initiator’s iSLB metric (weight).
Note The VRRP master interface is treated specially and it needs to take a lower load compared to the other interfaces. This is to account for the redirection work performed by the master interface for every session. A new initiator is assigned to the master interface only if the following is true for every other interface:
VRRP backup interface load > [2 * VRRP master interface load + 1]
About iSLB Configuration Distribution Using CFS
You can distribute the configuration for iSLB initiators and initiator targets on an MDS switch. This feature lets you synchronize the iSLB configuration across the fabric from the console of a single MDS switch. The iSCSI initiator idle timeout, global authentication, and iSCSI dynamic initiator mode parameters are also distributed. CFS distribution is disabled by default.
Configuration for iSLB initiators and initiator targets on an MDS switch can be distributed using the Cisco Fabric Services (CFS). This feature allows you to synchronize the iSLB configuration across the fabric from the console of a single MDS switch. The iSCSI initiator idle timeout, iSCSI dynamic initiator mode, and global authentication parameters are also distributed. CFS distribution is disabled by default (see the System Management Configuration Guide, Cisco DCNM for SANCisco MDS 9000 Family NX-OS System Management Configuration Guide for more information).
After enabling the distribution, the first configuration starts an implicit session. All server configuration changes entered thereafter are stored in a temporary database and applied to all switches in the fabric (including the originating one) when you explicitly commit the database.
When CFS is enabled for iSLB, the first iSLB configuration operation starts a CFS session and locks the iSLB configuration in the fabric. The configuration changes are applied to the pending configuration database. When you make the changes to the fabric, the pending configuration is distributed to all the switches in the fabric. Each switch then validates the configuration. This check ensures the following:
-
The VSANs assigned to the iSLB initiators are configured on all the switches.
-
The static WWNs configured for the iSLB initiators are unique and available on all the switches.
-
The iSLB initiator node names do not conflict with the iSCSI initiators on all the switches.
After the check completes successfully, all the switches commit the pending configuration to the running configuration. If any check fails, the entire commit fails.
Note iSLB is only fully supported when CFS is enabled. Using iSLB auto-zoning without enabling CFS mode may cause traffic disruption when any zone set is activated.
Note CFS does not distribute non-iSLB initiator configurations or import Fibre Channel target settings.
Non-iSLB virtual targets will continue to support advertised interfaces option.
Tip The pending changes are only available in the volatile directory and are discarded if the switch is restarted.
Locking the Fabric
The first action that modifies the existing configuration creates the pending configuration and locks the feature in the fabric. Once you lock the fabric, the following conditions apply:
-
No other user can make any configuration changes to this feature.
-
A pending configuration is created by copying the active configuration. Modifications from this point on are made to the pending configuration and remain there until you commit the changes to the active configuration (and other switches in the fabric) or discard them.
Note iSCSI configuration changes are not allowed when an iSLB CFS session is active.
CFS Merge Process
When two fabrics merge, CFS attempts to merge the iSLB configuration from both the fabrics. A designated switch (called the
dominant switch
) in one fabric sends its iSLB configuration to a designated switch (called the
subordinate switch
) in the other fabric. The subordinate switch compares its running configuration to the received configuration for any conflicts. If no conflicts are detected, it merges the two configurations and sends it to all the switches in both the fabrics. Each switch then validates the configuration. This check ensures the following:
-
VSANs assigned to the iSLB initiators are configured on all the switches.
-
The static WWNs configured for the iSLB initiators are unique and available on all the switches.
-
The iSLB initiator node names have no conflicts with iSCSI initiators on all the switches.
If this check completes successfully, the subordinate switch directs all the switches to commit the merged configuration to running configuration. If any check fails, the merge fails.
The
show islb merge status
command displays the exact reason for the failure. The first successful commit request after a merge failure takes the fabric out of the merge failure state.
iSLB CFS Merge Status Conflicts
Merge conflicts may occur. User intervention is required for the following merge conflicts:
-
The iSCSI global authentication or iSCSI initiator idle timeout parameters are not configured the same in the two fabrics.
-
The same iSLB initiator is configured differently in the two fabrics.
-
An iSLB initiator in one fabric has the same name as an iSCSI initiator in the other fabric.
-
Duplicate pWWN/nWWN configuration is detected in the two fabric. For example, a pWWN/nWWN configured for an iSLB initiator on one fabric is configured for an iSCSI initiator or a different iSLB initiator in the other fabric.
-
A VSAN configured for an iSLB initiator in one fabric does not exist in the other fabric.
Tip Check the syslog for details on merge conflicts.
User intervention is not required when the same iSLB initiator has a different set of non-conflicting initiator targets. The merged configuration is the union of all the initiator targets.
iSCSI High Availability
The following high availability features are available for iSCSI configurations:
Transparent Target Failover
The following high availability features are available for iSCSI configurations:
-
iSCSI high availability with host running multi-path software—In this topology, you have recovery from failure of any of the components. The host multi-path software takes care of load balancing or failover across the different paths to access the storage.
-
iSCSI high availability with host not having multi-path software—Without multi-path software, the host does not have knowledge of the multiple paths to the same storage.
iSCSI High Availability with Host Running Multi-Path Software
Figure 40-11 shows the physical and logical topology for an iSCSI HA solution for hosts running multi-path software. In this scenario, the host has four iSCSI sessions. There are two iSCSI sessions from each host NIC to the two IPS ports.
Figure 40-11 Host Running Multi-Path Software
Each IPS ports is exporting the same two Fibre Channel target ports of the storage but as different iSCSI target names if you use dynamic iSCSI targets). So the two IPS ports are exporting a total of four iSCSI target devices. These four iSCSI targets map the same two ports of the Fibre Channel target.
The iSCSI host uses NIC-1 to connect to IPS port 1 and NIC-2 to connect to IPS port 2. Each IPS port exports two iSCSI targets, so the iSCSI host creates four iSCSI sessions.
If the iSCSI host NIC-1 fails (see Figure 40-11 for the physical view), then sessions 1 and 2 fail but we still have sessions 3 and 4.
If the IPS port 1 fails, the iSCSI host cannot connect to the IPS port, and sessions 1 and 2 fail. But sessions 3 and 4 are still available.
If the storage port 1 fails, then the IPS ports will terminate sessions 1 and 3 (put iSCSI virtual target iqn.com.cisco.mds-5.1-2.p1 and iqn-com.cisco.mds-5.1-1.p1 in offline state). But sessions 2 and 4 are still available.
In this topology, you have recovery from failure of any of the components. The host multi-path software takes care of load-balancing or failover across the different paths to access the storage.
iSCSI HA with Host Not Having Any Multi-Path Software
The above topology will not work if the host does not have multi-path software because the host has multiple sessions to the same storage. Without multi-path software the host does not have knowledge of the multiple paths to the same storage.
IP storage has two additional features that provide an HA solution in this scenario.
-
IPS ports support the VRRP feature
-
IPS has transparent Fibre Channel target failover for iSCSI static virtual targets.
Statically imported iSCSI targets have an additional option to provide a secondary pWWN for the Fibre Channel target. This can be used when the physical Fibre Channel target is configured to have an LU visible across redundant ports. When the active port fails, the secondary port becomes active and the iSCSI session switches to use the new active port (see Figure 40-12).
Figure 40-12 Static Target Importing Through Two Fibre Channel Ports
In Figure 40-12, you can create an iSCSI virtual target that is mapped to both pWWN1 and pWWN2 to provide redundant access to the Fibre Channel targets.
The failover to a secondary port is done transparently by the IPS port without impacting the iSCSI session from the host. All outstanding I/Os are terminated with a check condition status when the primary port fails. New I/Os received during the failover are not completed and receive a busy status.
Tip If you use LUN mapping, you can define a different secondary Fibre Channel LUN if the LU number is different.
Enable the optional
revert-primary-port
option to direct the IPS port to switch back to the primary port when the primary port is up again. If this option is disabled (default) and the primary port is up again after a switchover, the old sessions will remain with the secondary port and do not switch back to the primary port. However, any new session will use the primary port. This is the only situation when both the primary and secondary ports are used at the same time.
LUN Trespass for Storage Port Failover
In addition to the high availability of statically imported iSCSI targets, the trespass feature is available to enable the move of LUs, on an active port failure, from the active to the passive port of a statically imported iSCSI target.
In physical Fibre Channel targets, which are configured to have LUs visible over two Fibre Channel N ports, when the active port fails, the passive port takes over. Some physical Fibre Channel targets require that the trespass feature be used to move the LUs from the active port to the passive port. A statically imported iSCSI target's secondary pWWN option and an additional option of enabling the trespass feature is available for a physical Fibre Channel target with redundant ports. When the active port fails, the passive port becomes active, and if the trespass feature is enabled, the Cisco MDS switch sends a request to the target to move the LUs on the new active port. The iSCSI session switches to use the new active port and the moved LUs are accessed over the new active port (see Figure 40-13).
Figure 40-13 Virtual Target with an Active Primary Port
Multiple IPS Ports Connected to the Same IP Network
Figure 40-14 provides an example of a configuration with multiple Gigabit Ethernet interfaces in the same IP network.
Figure 40-14 Multiple Gigabit Ethernet Interfaces in the Same IP Network
In Figure 40-14, each iSCSI host discovers two iSCSI targets for every physical Fibre Channel target (with different names). The multi-pathing software on the host provides load-balancing over both paths. If one Gigabit Ethernet interface fails, the host multi-pathing software is not affected because it can use the second path.
VRRP-Based High Availability
Figure 40-15 provides an example of a VRRP-based high availability iSCSI configuration.
Figure 40-15 VRRP-Based iSCSI High Availability
In Figure 40-15, each iSCSI host discovers one iSCSI target for every physical Fibre Channel target. When the Gigabit Ethernet interface of the VRRP master fails, the iSCSI session is terminated. The host then reconnects to the target and the session comes up because the second Gigabit Ethernet interface has taken over the virtual IP address as the new master.
Ethernet PortChannel-Based High Availability
All iSCSI data traffic for one iSCSI link is carried on one TCP connection. Consequently, the aggregated bandwidth is 1 Gbps for that iSCSI link.
Figure 40-16 provides a sample Ethernet PortChannel-based high availability iSCSI configuration.
Figure 40-16 Ethernet PortChannel-Based iSCSI High Availability
In Figure 40-16, each iSCSI host discovers one iSCSI target for every physical Fibre Channel target. The iSCSI session from the iSCSI host to the iSCSI virtual target (on the IPS port) uses one of the two physical interfaces (because an iSCSI session uses one TCP connection). When the Gigabit Ethernet interface fails, the IPS module and the Ethernet switch transparently forwards all the frames on to the second Gigabit Ethernet interface.
Note If an Ethernet PortChannel is configured between the IPS module and an Ethernet switch, the load balancing policy on the Ethernet switch must be based on source/destination IP address only, not port numbers, for load balancing with VRRP to operate correctly.
iSNS
Internet Storage Name Service (iSNS) allows your existing TCP/IP network to function more effectively as a SAN by automating the discovery, management, and configuration of iSCSI devices. To facilitate these functions, the iSNS server and client function as follows:
-
The iSNS client registers iSCSI portals and all iSCSI devices accessible through them with an iSNS server.
-
The iSNS server provides the following services for the iSNS client:
– Device registration
– State change notification
– Remote domain discovery services
All iSCSI devices (both initiator and target) acting as iSNS clients, can register with an iSNS server. iSCSI initiators can then query the iSNS server for a list of targets. The iSNS server will respond with a list of targets that the querying client can access based on configured access control parameters.
A Cisco MDS 9000 Family switch can act as an iSNS client and register all available iSCSI targets with an external iSNS server. All switches in the Cisco MDS 9000 Family with IPS modules or MPS-14/2 modules installed support iSNS server functionality. This allows external iSNS clients, such as an iSCSI initiator, to register with the switch and discover all available iSCSI targets in the SAN.
About iSNS Client Functionality
Internet Storage Name Service (iSNS) allows your existing TCP/IP network to function more effectively as a SAN by automating the discovery, management, and configuration of iSCSI devices. The iSNS client registers iSCSI portals and all iSCSI devices accessible through them with an iSNS server. All iSCSI devices (both initiator and target) acting as iSNS clients can register with an iSNS server. When the iSNS client is unable to register or deregister objects with the iSNS server (for example, the client is unable to make a TCP connection to the iSNS server), it retries every minute to reregister all iSNS objects for the affected interfaces with the iSNS server.
The iSNS client functionality on each IPS interface (Gigabit Ethernet interface or subinterface or PortChannel) registers information with an iSNS server.
Once a profile is tagged to an interface, the switch opens a TCP connection to the iSNS server IP address (using the well-known iSNS port number 3205) in the profile and registers network entity and portal objects; a unique entity is associated with each IPS interface. The switch then searches the Fibre Channel name server (FCNS) database and switch configuration to find storage nodes to register with the iSNS server.
Statically mapped virtual targets are registered if the associated Fibre Channel pWWN is present in the FCNS database and no access control configuration prevents it. A dynamically mapped target is registered if dynamic target importing is enabled. See the “Presenting Fibre Channel Targets as iSCSI Targets” section for more details on how iSCSI imports Fibre Channel targets.
A storage node is deregistered from the iSNS server when it becomes unavailable when a configuration changes (such as access control change or dynamic import disabling) or the Fibre Channel storage port goes offline. It is registered again when the node comes back online.
When the iSNS client is unable to register or deregister objects with the iSNS server (for example, the client is unable to make a TCP connection to the iSNS server), it retries every minute to reregister all iSNS objects for the affected interfaces with the iSNS server. The iSNS client uses a registration interval value of 15 minutes. If the client fails to refresh the registration during this interval, the server will deregister the entries.
Untagging a profile also causes the network entity and portal to be deregistered from that interface.
Note The iSNS client is not supported on a VRRP interface.
About iSNS Server Functionality
When enabled, the iSNS server on the Cisco 9000 Family MDS switch tracks all registered iSCSI devices. As a result, iSNS clients can locate other iSNS clients by querying the iSNS server. The iSNS server also provides the following functionalities:
-
Allows iSNS clients to register, deregister, and query other iSNS clients registered with the iSNS server.
-
Provides centralized management for enforcing access control to provide or deny access to targets from specific initiators.
-
Provides a notification mechanism for registered iSNS clients to receive change notifications on the status change of other iSNS clients.
-
Provides a single access control configuration for both Fibre Channel and iSCSI devices.
-
Discovers iSCSI targets that do not have direct IP connectivity to the iSCSI initiators.
iSNS Client Registration and Deregistration
You can use the
show isns database
command to display all registered iSNS clients and their associated configuration.
An iSNS client cannot query the iSNS server until it has registered. iSNS client deregistration can occur either explicitly or when the iSNS server detects that it can no longer reach the client (through ESI monitoring).
iSNS client registration and deregistration result in status change notifications (SCNs) being generated to all interested iSNS clients.
Target Discovery
iSCSI initiators discover targets by issuing queries to the iSNS server. The server supports DevGetNext requests to search the list of targets and DevAttrQuery to determine target and portal details, such as the IP address or port number to which to connect.
On receiving a query request from the iSCSI client, the iSNS server queries the Fibre Channel Name Server (FCNS) to obtain a list of Fibre Channel targets that are accessible by the querying initiator. The result of this query depends on zoning configuration currently active and current configuration(s) of the initiator. The iSNS server will subsequently use the iSCSI target configuration(s) (virtual target and dynamic import configuration) to translate the Fibre Channel target to an equivalent iSCSI target. At this stage it also applies any access control configured for the virtual target. A response message with the target details is then sent back to the query initiator.
The iSNS server sends a consolidated response containing all possible targets and portals to the querying initiator. For example, if a Fibre Channel target is exported as different iSCSI targets on different IPS interfaces, the iSNS server will respond with a list of all possible iSCSI targets and portals.
In order to keep the list of targets updated, the iSNS server sends state change notifications (SCN) to the client whenever an iSCSI target becomes reachable or unreachable. The client is then expected to rediscover its list of accessible targets by initiating another iSNS query. Reachability of iSCSI targets changes when any one of the following occurs:
-
Target goes up or down.
-
Dynamic import of FC target configuration changes.
-
Zone set changes.
-
Default zone access control changes.
-
IPS interface state changes.
-
Initiator configuration change makes the target accessible or inaccessible.
About Cloud Discovery
When an iSNS server receives a query request, it responds with a list of available targets and the portals through which the initiator can reach the target. The IP network configuration outside the MDS switch may result in only a subset of Gigabit Ethernet interfaces being reachable from the initiator. To ensure that the set of portals returned to the initiator is reachable, the iSNS server needs to know the set of Gigabit Ethernet interfaces that are reachable from a given initiator.
Note iSNS Cloud Discovery is not supported on the Cisco Fabric Switch for IBM BladeCenter and Cisco Fabric Switch for HP c-Class BladeSystem.
The iSNS cloud discovery feature provides information to the iSNS server on the various interfaces reachable from an initiator by partitioning the interfaces on a switch into disjointed IP clouds. This discovery is achieved by sending messages to all other known IPS ports that are currently up and, depending on the response (or the lack of it), determines if the remote IPS port is in the same IP network or in a different IP network.
Cloud discovery is initiated when the following events occur:
-
Manual requests from the CLI initiate cloud discovery from the CLI. This action causes the destruction of existing memberships and makes new ones.
-
Auto-discovery of the interface results in an interface being assigned to its correct cloud. All other cloud members are not affected. The membership of each cloud is built incrementally and is initiated by the following events:
– A Gigabit Ethernet interface comes up. This can be a local or remote Gigabit Ethernet interface.
– The IP address of a Gigabit Ethernet interface changes.
– The VRRP configuration on a port changes.
The iSNS server distributes cloud and membership information across all the switches using CFS. Therefore, the cloud membership view is the same on all the switches in the fabric.
Note For CFS distribution to operate correctly for iSNS cloud discovery, all switches in the fabric must be running Cisco SAN-OS Release 3.0(1) or NX-OS 4.1(1b) and later.
Configuring iSCSI
This section describes how to configure iSCSI on the Cisco MDS 9000 Family switches.
This section includes the following sections:
Enabling iSCSI
To use the iSCSI feature, you must explicitly enable iSCSI on the required switches in the fabric. Alternatively, you can enable or disable the iSCSI feature directly on the required modules using Cisco DCNM for SAN or Device Manager. By default, this feature is disabled in all switches in the Cisco MDS 9000 Family.
Caution When you disable this feature, all related configurations are automatically discarded.
To enable iSCSI on any participating switch, follow these steps:
|
|
|
Step 1
|
switch#
config t
|
Enters the configuration commands, one per line. End with CNTL/Z.
|
Step 2
|
switch(config)#
feature iscsi
|
Enables iSCSI on that switch.
|
switch(config)#
iscsi enable module <x>
|
Enables iSCSI modules on the switch.
Note New command added so that SME and iSCSI are available on the same switch.
|
switch(config)#
no iscsi enable module <x>
|
Disables the iSCSI module on the switch.
|
switch(config)#
no
feature iscsi
|
Disables (default) iSCSI on that switch.
|
To enable iSCSI on any switch, follow these steps:
Step 1 Choose FC Services
>
iSCSI
in the Physical Attributes pane.
You see the iSCSI tables in the Information pane.
The
Control
tab is the default tab. You see the iSCSI enable status for all switches in the fabric that contain IPS ports.
Step 2 Choose
enable
from the Command column for each switch that you want to enable iSCSI on.
Step 3 Click the
Apply Changes
icon to save these changes.
To enable iSCSI on a module, follow these steps:
Step 1 Choose FC Services
>
iSCSI
in the Physical Attributes pane.
You see the iSCSI tables in the Information pane.
Step 2 Click the Module Control tab.
You see the Module Control dialog box in the information pane.
Step 3 Check the Mode Admin check box to enable iSCSI for a specified port on the selected module.
Step 4 Click the
Apply Changes
icon to save these changes.
To enable iSCSI on a module using Device Manager, follow these steps:
Step 1 Choose
IP
>
iSCSI
You see the iSCSI table.
Step 2 Check the Mode Admin check box to enable iSCSI for the specified port on the selected module.
Step 3 Click Apply to save these changes.
Creating iSCSI Interfaces
Each physical Gigabit Ethernet interface on an IPS module or MPS-14/2 module can be used to translate and route iSCSI requests to Fibre Channel targets and responses in the opposite direction. To enable this capability, the corresponding iSCSI interface must be in an enabled state.
To enable iSCSI interfaces, follow these steps:
Step 1 Enable the required Gigabit Ethernet interface.
switch(config)# interface gigabitethernet 2/1 switch(config-if)# no shutdown
Step 2 Create the required iSCSI interface and enable the interface.
switch(config)# interface iscsi 2/1 switch(config-if)# no shutdown
Using the iSCSI Wizard
To use the iSCSI wizard in Cisco DCNM-SAN, follow these steps:
Step 1 Click the
iSCSI Setup Wizard
icon.
You see the iSCSI Wizard Configure Initiator dialog box.
Step 2 Select an existing iSCSI initiator or add the iSCSI node name or IP address for a new iSCSI initiator.
Step 3 Select the switch for this iSCSI initiator if you are adding a new iSCSI initiator and click
Next
.
You see the iSCSI Wizard Select Targets dialog box.
Step 4 Select the VSAN and targets to associate with this iSCSI initiator and click
Next
.
Note The iSCSI wizard turns on the Dynamic Import FC Targets feature.
You see the iSCSI Wizard Select Zone dialog box.
Step 5 Set the zone name for this new iSCSI zone and check the
ReadOnly
check box if needed.
Step 6 Click
Finish
to create this iSCSI initiator.
If created, the target VSAN is added to the iSCSI host VSAN list.
Note iSCSI wizard automatically turns on the Dynamic FC target import.
Enabling Dynamic Mapping
To enable dynamic mapping of Fibre Channel targets into iSCSI, follow these steps:
|
|
|
Step 1
|
switch#
config terminal
switch(config)#
|
Enters configuration mode.
|
Step 2
|
switch(config)#
iscsi import target fc
|
IPS modules and MPS-14/2 modules dynamically import all Fibre Channel targets in the Fibre Channel SAN into the IP network.
|
To enable dynamic mapping of Fibre Channel targets into iSCSI using Device Manager, follow these steps:
Step 1 Choose
IP
>
iSCSI
.
-
You see the iSCSI configuration.
Step 2 Click the Target tab to display a list of existing iSCSI targets.
Step 3 Check the Dynamically Import FC Targets check box.
Step 4 Click Apply to save this change.
Creating Static Mapping
To create a static iSCSI virtual target for the entire Fibre Channel target port using Device Manager, follow these steps:
Step 1 Click
IP
>
iSCSI
.
You see the iSCSI configuration.
Step 2 Click the Targets tab to display a list of existing iSCSI targets .
Step 3 Click Create to create an iSCSI target.
You see the Create iSCSI Targets dialog box.
Step 4 Set the iSCSI target node name in the iSCSI Name field, in IQN format.
Step 5 Set the Port WWN field for the Fibre Channel target port you are mapping.
Step 6 Click the
Select from List
radio button and set the iSCSI initiator node names or IP addresses that you want this virtual iSCSI target to access, or click the
All
radio button to let the iSCSI target access all iSCSI initiators. Also see the “iSCSI Access Control” section.
Step 7 Click the
Select from List
radio button and check each interface you want to advertise the iSCSI targets on or click the
All
radio button to advertise all interfaces.
Step 8 Click
Apply
to save this change.
Tip An iSCSI target cannot contain more than one Fibre Channel target port. If you have already mapped the whole Fibre Channel target port, you cannot use the LUN mapping option.
Note See the “iSCSI-Based Access Control” section for more information on controlling access to statically mapped targets.
Advertising Static iSCSI Targets
You can limit the Gigabit Ethernet interfaces through which static iSCSI targets are advertised. By default iSCSI targets are advertised on all Gigabit Ethernet interfaces, subinterfaces, PortChannel interfaces, and PortChannel subinterfaces.
To configure a specific interface that should advertise the iSCSI virtual target using Device Manager, follow these steps:
Step 1 Select
IP
>
iSCSI
.
You see the iSCSI configuration.
Step 2 Click the Targets tab to display a list of existing iSCSI targets.
Step 3 Right-click the iSCSI target that you want to modify and click
Edit Advertised
.
You see the Advertised Interfaces dialog box.
Step 4 (Optional) Right-click an interface that you want to delete and click
Delete
.
Step 5 (Optional) Click Create to advertise on more interfaces.
You see the Create Advertised Interfaces dialog box.
To configure a specific interface that should advertise the iSCSI virtual target, follow these steps:
|
|
|
Step 1
|
switch(config-iscsi-tgt)#
advertise interface GigabitEthernet 2/5
|
Advertises the virtual target only on the specified interface. By default, it is advertised on all interfaces in all IPS modules or MPS-14/2 modules.
Note To advertise the virtual target on multiple interfaces, issue the command for each interface.
|
switch(config-iscsi-tgt)#
no
advertise interface GigabitEthernet 2/5
|
Removes this interface from the list of interfaces from which this target is advertised.
|
Specifying the Initiator Identification
You can configure the iSCSI initiator identification mode on each IPS port and all the iSCSI hosts terminating on the IPS port will be identified according to that configuration. The default mode is to identify the initiator by name.
To specify the initiator identification mode, follow these steps:
|
|
|
Step 1
|
switch#
config t
switch(config)#
|
Enters the configuration mode.
|
Step 2
|
switch(config)#
interface iscsi 4/1
switch(config-if)#
|
Selects the iSCSI interface on the switch that identifies all the initiators.
|
Step 3
|
switch(config-if)#
switchport initiator id ip-address
|
Identifies the iSCSI initiator based on the IP address.
|
switch(config-if)#
switchport initiator id name
|
Identifies the iSCSI initiator based on the initiator node name. This is the default behavior.
|
To specify the initiator identification mode, follow these steps:
Step 1 Choose
Interfaces
>
FC Logical
from the Physical Attributes pane.
You see the interfaces configuration in the Information pane.
Step 2 Click the
iSCSI
tab.
You see the iSCSI interfaces configuration.
Step 3 Right-click the Initiator ID Mode field for the iSCSI interface that you want to modify and select
name
or
ipaddress
from the drop-down menu.
Step 4 Click
Apply Changes
to save this change.
Configuring the iSCSI Initiator Idle Timeout
iSCSI initiator idle timeout specifies the time for which the virtual Fibre Channel N port is kept idle after the initiator logs out from its last iSCSI session. The default value for this timer is 300 seconds. This is useful to avoid N ports logging in to and logging off of the Fibre Channel SAN as transient failure occurs in the IP network. This helps reduce unnecessary RSCNs being generated in the Fibre Channel SAN.
To configure the initiator idle timeout, follow these steps:
|
|
|
Step 1
|
switch#
config t
switch(config)#
|
Enters the configuration mode.
|
Step 2
|
switch(config)#
iscsi initiator idle-timeout 10
|
Configures the iSCSI initiators to have an idle timeout value of 10 seconds.
|
To configure the initiator idle timeout, follow these steps:
Step 1 Choose
End Devices
>
iSCSI
in the Physical Attributes pane.
You see the iSCSI tables in the Information pane.
Step 2 Click the
Globals
tab.
You see the iSCSI global configuration.
Step 3 Right-click on the InitiatorIdle Timeout field that you want to modify and enter the new timeout value.
Step 4 Click the
Apply Changes
icon to save these changes.
Configuring Dynamic Mapping
To configure dynamic mapping (using the
name
option) for an iSCSI initiator, follow these steps:
|
|
|
Step 1
|
switch#
config t
switch(config)#
|
Enters configuration mode.
|
Step 2
|
switch(config)#
iscsi dynamic initiator islb
|
Specifies iSLB dynamic initiator mode.
|
switch(config)#
iscsi dynamic initiator deny
|
Disallows dynamic initiators from logging on to the MDS switch.
|
switch(config)#
no iscsi dynamic initiator islb
|
Reverts to iSCSI mode (default).
|
Configuring Static Mapping
To configure static mapping (using the
name
option) for an iSCSI initiator, follow these steps:
|
|
|
Step 1
|
switch#
config t
switch(config)#
|
Enters configuration mode.
|
Step 2
|
switch(config)#
iscsi initiator name iqn.1987-02.com.cisco.initiator
switch(config-iscsi-init)#
|
Configures an iSCSI initiator using the iSCSI name of the initiator node. The maximum name length is restricted to 223 alphanumeric characters. The minimum length is 16.
|
switch(config)#
no iscsi initiator name iqn.1987-02.com.cisco.initiator
|
Deletes the configured iSCSI initiator.
|
To configure static mapping for an iSCSI initiator using Device Manager, follow these steps:
Step 1 Select
IP
>
iSCSI
.
You see the iSCSI configuration. The Initiators tab is the default.
Step 2 Click Create to create an iSCSI initiator.
You see the Create iSCSI Initiators dialog box.
Step 3 Set the iSCSI node name or IP address and VSAN membership.
Step 4 In the Node WWN section, check the
Persistent
check box.
Step 5 Check the
System Assigned
check box if you want the switch to assign the nWWN or leave this unchecked and set the Static WWN field.
Step 6 In the Port WWN section, check the
Persistent
check box if you want to statically map pWWNs to the iSCSI initiator.
Step 7 If persistent, check the
System Assigned
check box and set the number of pWWNs to reserve for this iSCSI initiator if you want the switch to assign pWWNs. Alternately, you can leave this unchecked and set one or more pWWNs for this iSCSI initiator.
Step 8 (Optional) Set the AuthUser field if authentication is enabled. Also see the “iSCSI Session Authentication” section.
Step 9 Click
Create
to create this iSCSI initiator.
To configure static mapping (using the
ip-address
option) for an iSCSI initiator, follow these steps:
|
|
|
Step 1
|
switch#
config terminal
switch(config)#
|
Enters configuration mode.
|
Step 2
|
switch(config)#
iscsi initiator ip-address 10.50.0.0
switch(config-iscsi-init)#
|
Configures an iSCSI initiator using the IPv4 address of the initiator node.
|
switch(config)#
iscsi initiator ip-address 2001:0DB8:800:200C::417A
switch(config-iscsi-init)#
|
Configures an iSCSI initiator using the IPv6 unicast address of the initiator node.
|
switch(config)#
no iscsi initiator ip-address 2001:0DB8:800:200C::417A
|
Deletes the configured iSCSI initiator.
|
To assign the WWN for an iSCSI initiator, follow these steps:
|
|
|
Step 1
|
switch(config-iscsi-init)#
static nWWN system-assign
|
Uses the switch’s WWN pool to allocate the nWWN for this iSCSI initiator and keeps it persistent.
|
switch(config-iscsi-init)#
static
nWWN 20:00:00:05:30:00:59:11
|
Assigns the user provided WWN as the nWWN for the iSCSI initiator. You can only specify one nWWN for each iSCSI node.
|
Step 2
|
switch(config-iscsi-init)#
static pWWN system-assign 2
|
Uses the switch’s WWN pool to allocate two pWWNs for this iSCSI initiator and keeps them persistent. The range is from 1 to 64.
|
switch(config-iscsi-init)#
static pWWN 21:00:00:20:37:73:3b:20
|
Assigns the user provided WWN as the pWWN for the iSCSI initiator.
|
Note If the system-assign option is used to configure WWNs for an iSCSI initiator, when the configuration is saved to an ASCII file the system-assigned WWNs are also saved. Subsequently if you perform a write erase, you must manually delete the WWN configuration from the ASCII file. Failing to do so can cause duplicate WWN assignments if the ASCII configuration file is reapplied on the switch.
Making the Dynamic iSCSI Initiator WWN Mapping Static
After a dynamic iSCSI initiator has already logged in, you may decide to permanently keep the automatically assigned nWWN/pWWN mapping so this initiator uses the same mapping the next time it logs in.
You can convert a dynamic iSCSI initiator to static iSCSI initiator and make its WWNs persistent (see the “Dynamic Mapping” section).
Note You cannot convert a dynamic iSCSI initiator to a static iSLB initiator or a dynamic iSLB initiator to a static iSCSI initiator.
Note Making the dynamic pWWNs static after the initiator is created is supported only through the CLI, not through Device Manager or Cisco DCNM- SAN. In Cisco DCNM-SAN or Device Manager, you must delete and then recreate this initiator to have the pWWNs static.
To permanently keep the automatically assigned nWWN/pWWN mapping, follow these steps:
|
|
|
Step 1
|
switch#
config terminal
switch(config)#
|
Enters configuration mode.
|
Step 2
|
switch(config)#
iscsi save-initiator name iqn.1987-02.com.cisco.initiator
|
Saves the nWWN and pWWNs that have automatically been assigned to the iSCSI initiator whose name is specified.
|
switch(config)#
iscsi save-initiator ip-address 10.10.100.11
|
Saves the nWWN and pWWNs that have automatically been assigned to the iSCSI initiator whose IPv4 address is specified.
|
switch(config)#
iscsi save-initiator ip-address 2001:0DB8:800:200C::417A
|
Saves the nWWN and pWWNs that have automatically been assigned to the iSCSI initiator whose IPv6 unicast address is specified.
|
switch(config)#
iscsi save-initiator
|
Saves the nWWN and pWWNs that have automatically been assigned to all the initiators.
|
Step 3
|
switch(config)#
exit
switch#
|
Returns to EXEC mode.
|
Step 4
|
switch#
copy running-config startup-config
|
Saves the nWWN/pWWN mapping configuration across system reboots.
|
Checking for WWN Conflicts
WWNs assigned to static iSCSI initiators by the system can be inadvertently returned to the system when an upgrade fails or you downgrade the system software (manually booting up an older Cisco MDS SAN-OS release without using the
install all
command). In these instances, the system can later assign those WWNs to other iSCSI initiators (dynamic or static) and cause conflicts.
You can address this problem by checking for and removing any configured WWNs that belong to the system whenever such scenarios occur.
To check for and remove WWN conflicts, follow these steps:
|
|
|
Step 1
|
switch#
config t
switch(config)#
|
Enters configuration mode.
|
Step 2
|
switch(config)#
iscsi duplicate-wwn-check
List of Potential WWN Conflicts:
--------------------------------
Node : iqn.test-local-nwwn:1-local-pwwn:1
nWWN : 22:03:00:0d:ec:02:cb:02
pWWN : 22:04:00:0d:ec:02:cb:02
|
Checks for WWN conflicts.
|
Step 3
|
switch(config)#
iscsi initiator name iqn.test-local-nwwn:1-local-pwwn:1
|
Enters iSCSI initiator configuration mode for the initiator named iqn.test-local-nwwn:1-local-pwwn:1.
|
Step 4
|
switch(config-iscsi-init)#
no static nWWN 22:03:00:0d:ec:02:cb:02
|
Removes a conflicting nWWN.
|
Step 5
|
switch(config-iscsi-init)#
no static pWWN 22:04:00:0d:ec:02:cb:02
|
Removes a conflicting pWWN.
|
To permanently keep the automatically assigned nWWN mapping, follow these steps:
Step 1 Choose
End Devices
>
iSCSI
in the Physical Attributes pane.
You see the iSCSI tables in the Information pane.
Step 2 Click the
Initiators
tab.
You see the iSCSI initiators configured.
Step 3 Check the
Persistent Node WWN
check box for the iSCSI initiators that you want to make static.
Step 4 Click the
Apply Changes
icon to save these changes.
Configuring the Proxy Initiator
To configure the proxy initiator, follow these steps:
|
|
|
Step 1
|
switch#
config terminal
switch(config)#
|
Enters configuration mode.
|
Step 2
|
switch(config)#
interface iscsi 4/1
switch(config-if)#
|
Selects the iSCSI interface on the switch that initiators will connect to.
|
Step 3
|
switch(config-if)#
switchport proxy-initiator
|
Configures the proxy initiator mode with system-assignment nWWN and pWWN.
|
switch(config-if)#
no
switchport proxy-initiator
|
Disables the proxy initiator mode.
|
Step 4
|
switch(config-if)#
switchport proxy-initiator nWWN 11:11:11:11:11:11:11:11 pwwn 22:22:22:22:22:22:22:22
|
(Optional) Configures the proxy initiator mode using the specified WWNs.
|
switch(config-if)#
no switchport proxy-initiator nWWN 11:11:11:11:11:11:11:11 pwwn 22:22:22:22:22:22:22:22
|
Disables the proxy initiator mode.
|
To configure the proxy initiator, follow these steps:
Step 1 Expand
Switches
, expand FC
Interfaces,
and then select
Logical
in the Physical Attributes pane.
You see the Interface tables in the Information pane.
Step 2 In Device Manager, select Interface >
Ethernet and iSCSI
.
You see the Ethernet Interfaces and iSCSI dialog box.
Step 3 Click the
iSCSI
tab in either FM or DM.
You see the iSCSI interface configuration table.
Step 4 Check the
Proxy Mode Enable
check box.
Step 5 Click the
Apply Changes
icon in Cisco DCNM-SAN or click Apply in Device Manager to save these changes.
Note When an interface is in proxy initiator mode, you can only configure Fibre Channel access control (zoning) based on the iSCSI interface’s proxy N port attributes—the WWN pairs or the FC ID. You cannot configure zoning using iSCSI attributes such as IP address or IQN of the iSCSI initiator. To enforce initiator-based access control, use iSCSI based access control (see the “iSCSI Access Control” section).
Configuring VSAN Membership for iSCSI Hosts
Individual iSCSI hosts can be configured to be in a specific VSAN. The specified VSAN overrides the iSCSI interface VSAN membership.
To assign VSAN membership for iSCSI hosts, follow these steps:
|
|
|
Step 1
|
switch#
config terminal
switch(config)#
|
Enters configuration mode.
|
Step 2
|
switch(config)#
iscsi initiator name iqn.1987-02.com.cisco.initiator
switch(config-iscsi-init)#
|
Configures an iSCSI initiator.
|
Step 3
|
switch(config-iscsi-init)#
vsan 3
|
Assigns the iSCSI initiator node to a specified VSAN.
Note You can assign this host to one or more VSANs.
|
switch(config-iscsi-init)#
no vsan 5
|
Removes the iSCSI node from the specified VSAN.
|
To assign VSAN membership for iSCSI hosts, follow these steps:
Step 1 Choose
End Devices
>
iSCSI
in the Physical Attributes pane.
You see the iSCSI tables in the Information pane.
Step 2 Click the
Initiators
tab.
You see the iSCSI initiators configured.
Step 3 Fill in the VSAN Membership field to assign a VSAN to the iSCSI hosts.
Step 4 Click the
Apply Changes
icon to save these changes.
Note When an initiator is configured in any other VSAN (other than VSAN 1), for example VSAN 2, the initiator is automatically removed from VSAN 1. If you also want it to be present in VSAN 1, you must explicitly configure the initiator in VSAN 1.
Configuring Default Port VSAN for iSCSI Interfaces
VSAN membership can be configured for an iSCSI interface, called the
port VSAN
. All the iSCSI devices that connect to this interface automatically become members of this VSAN, if it is not explicitly configured in a VSAN. In other words, the port VSAN of an iSCSI interface is the default VSAN for all dynamic iSCSI initiators. The default port VSAN of an iSCSI interface is VSAN 1.
To change the default port VSAN for an iSCSI interface, follow these steps:
|
|
|
Step 1
|
switch#
config t
switch(config)#
|
Enters configuration mode.
|
Step 2
|
switch(config)#
iscsi interface vsan-membership
|
Enables you to configure VSAN membership for iSCSI interfaces.
|
Step 3
|
switch(config)#
vsan database
switch(config-vsan-db)#
|
Configures the database for a VSAN. Application specific VSAN parameters cannot be configured from this prompt.
|
Step 4
|
switch(config
-
vsan-db)#
vsan 2 interface iscsi 2/1
|
Assigns the membership of the iscsi 2/1 interface to the specified VSAN (VSAN 2).
|
switch(config
-
vsan-db)#
no
vsan 2 interface iscsi 2/1
|
Reverts to using the default VSAN as the port VSAN of the iSCSI interface.
|
To change the default port VSAN for an iSCSI interface using Device Manager, follow these steps:
Step 1 Choose
Interface
>
Ethernet and iSCSI
.
You see the Ethernet Interfaces and iSCSI dialog box.
Step 2 Click the iSCSI tab.
You see the iSCSI interface configuration table.
Step 3 Double-click the PortVSAN column and modify the default port VSAN.
Step 4 Click
Apply
to save these changes.
Adding iSCSI Initiator to the Zone Database
To add an iSCSI initiator to the zone database, follow these steps:
|
|
|
Step 1
|
switch#
config terminal
switch(config)#
|
Enters configuration mode.
|
Step 2
|
switch(config)#
zone name iSCSIzone vsan 1
switch(config-zone)
|
Creates a zone name for the iSCSI devices in the IPS module or MPS-14/2 module to be included.
|
Step 3
|
switch(config-zone)#
member symbolic-nodename iqn.1987-02.com.cisco.initiator1
|
Assigns an iSCSI node name-based membership into a zone.
|
switch(config-zone)#
no member symbolic-nodename iqn.1987-02.com.cisco.init1
|
Deletes the specified device from a zone.
|
switch(config-zone)#
member ip-address 10.50.1.1
|
Assigns an iSCSI IPv4 address-based membership into a zone.
|
switch(config-zone)#
no member ip-address 10.50.1.1
|
Deletes the specified device from a zone.
|
switch(config-zone)#
member ipv6-address 2001:0DB8:800:200C::417A
|
Assigns an iSCSI IPv6 address-based membership into a zone.
|
switch(config-zone)#
no member ipv6-address 2001:0DB8:800:200C::417A
|
Deletes the specified device from a zone.
|
switch(config-zone)#
member pwwn 20:00:00:05:30:00:59:11
|
Assigns an iSCSI port WWN-based membership into a zone.
|
switch(config-zone)#
no member pwwn 20:00:00:05:30:00:59:11
|
Deletes the device identified by the port WWN from a zone.
|
To add an iSCSI initiator to the zone database, follow these steps:
Step 1 Choose
Zone
>
Edit Local Full Zone Database
.
You see the Edit Local Zone Database dialog box.
Step 2 Select the VSAN you want to add the iSCSI host initiator to and click
OK
.
You see the available zones and zone sets for that VSAN.
Step 3 From the list of available devices with iSCSI host initiators, drag the initiators to add into the zone.
Step 4 Click
Distribute
to distribute the change.
Configuring Access Control in iSCSI
To configure access control in iSCSIfollow these steps:
|
|
|
Step 1
|
switch#
config terminal
switch(config)#
|
Enters configuration mode.
|
Step 2
|
switch(config)#
iscsi virtual-target name iqn.1987-02.com.cisco.initiator
switch(config-iscsi-tgt)#
|
Creates the iSCSI target name iqn.1987-02.com.cisco.initiator.
|
Step 3
|
switch(config-iscsi-tgt)#
pWWN 26:00:01:02:03:04:05:06
switch(config-iscsi-tgt)#
|
Maps a virtual target node to a Fibre Channel target.
|
Step 4
|
switch(config-iscsi-tgt)#
initiator iqn.1987-02.com.cisco.initiator1 permit
|
Allows the specified iSCSI initiator node to access this virtual target. You can issue this command multiple times to allow multiple initiators.
|
switch(config-iscsi-tgt)#
no initiator iqn.1987-02.com.cisco.initiator1 permit
|
Prevents the specified initiator node from accessing virtual targets.
|
switch(config-iscsi-tgt)#
initiator ip address 10.50.1.1 permit
|
Allows the specified IPv4 address to access this virtual target. You can issue this command multiple times to allow multiple initiators.
|
switch(config-iscsi-tgt)#
no initiator ip address 10.50.1.1 permit
|
Prevents the specified IPv4 address from accessing virtual targets.
|
switch(config-iscsi-tgt)#
initiator ip address 10.50.1.0 255.255.255.0 permit
|
Allows all initiators in this IPv4 subnetwork (10.50.1/24) to access this virtual target.
|
switch(config-iscsi-tgt)#
no initiator ip address 10.50.1.0 255.255.255.0 permit
|
Prevents all initiators in this IPv4 subnetwork from accessing virtual targets.
|
switch(config-iscsi-tgt)#
initiator ip address 2001:0DB8:800:200C::417A permit
|
Allows the specified IPv6 unicast address to access this virtual target. You can issue this command multiple times to allow multiple initiators.
|
switch(config-iscsi-tgt)#
no initiator ip address 2001:0DB8:800:200C::417A permit
|
Prevents the specified IPv6 address from accessing virtual targets.
|
switch(config-iscsi-tgt)#
initiator ip address 2001:0DB8:800:200C::/64 permit
|
Allows all initiators in this IPv6 subnetwork (2001:0DB8:800:200C::/64) to access this virtual target.
|
switch(config-iscsi-tgt)#
no initiator ip address 2001:0DB8:800:200C::/64 permit
|
Prevents all initiators in this IPv6 subnetwork from accessing virtual targets.
|
switch(config-iscsi-tgt)#
all-initiator-permit
|
Allows all initiator nodes to access this virtual target.
|
switch(config-iscsi-tgt)#
no all-initiator-permit
|
Prevents any initiator from accessing virtual targets (default).
|
To configure access control in iSCSI using Device Manager, follow these steps:
Step 1 Select
IP
>
iSCSI
.
You see the iSCSI configuration.
Step 2 Click the
Targets
tab.
You see the iSCSI virtual targets.
Step 3 Uncheck the
Initiators Access All
check box if checked.
Step 4 Click
Edit Access
.
You see the Initiators Access dialog box.
Step 5 Click
Create
to add more initiators to the Initiator Access list.
You see the Create Initiators Access dialog box.
Step 6 Add the name or IP address for the initiator that you want to permit for this virtual target.
Step 7 Click
Create
to add this initiator to the Initiator Access List.
Configuring AAA Authentication for an iSCSI User
To configure AAA authentication for an iSCSI user, follow these steps:
|
|
|
Step 1
|
switch#
config t
switch(config)#
|
Enters configuration mode.
|
Step 2
|
switch(config)#
aaa authentication iscsi default group RadServerGrp
|
Uses RADIUS servers that are added in the group called RadServerGrp for the iSCSI CHAP authentication.
|
switch(config)#
aaa authentication iscsi default group TacServerGrp
|
Uses TACACS+ servers that are added in the group called TacServerGrp for the iSCSI CHAP authentication.
|
switch(config)#
aaa authentication iscsi default local
|
Uses the local password database for iSCSI CHAP authentication.
|
To configure AAA authentication for an iSCSI user, follow these steps:
Step 1 Choose
Switches
>
Security
>
AAA
in the Physical Attributes pane.
You see the AAA configuration in the Information pane.
Step 2 Click the
Applications
tab.
You see the AAA configuration per application.
Step 3 Right-click the ServerGroup Id List field for the iSCSI application and enter the server group that you want iSCSI to use.
Note You should use an existing server group or create a new server group before configuring it for iSCSI session authentication.
Step 4 Click the
Apply Changes
icon to save these changes.
Configuring Authentication Mechanism
You can configure iSCSI CHAP or None authentication at both the global level and at each interface level.
The authentication for a Gigabit Ethernet interface or subinterface overrides the authentication method configured at the global level.
If CHAP authentication is used, issue the
iscsi authentication chap
command at either the global level or at a per-interface level. If authentication should not be used at all, issue the
iscsi authentication none
command.
Detailed Steps
To configure the authentication mechanism for iSCSI, follow these steps:
|
|
|
Step 1
|
switch#
config t
switch(config)#
|
Enters configuration mode.
|
Step 2
|
switch(config)#
iscsi authentication chap
|
Configures CHAP as the default authentication mechanism globally for the Cisco MDS switch. CHAP authentication is required for all iSCSI sessions.
|
To configure AAA authentication for an iSCSI user, follow these steps:
Step 1 Choose
End Devices
>
iSCSI
in the Physical Attributes pane.
You see the iSCSI tables in the Information pane.
Step 2 Click the
Globals
tab.
You see the iSCSI authentication configuration table.
Step 3 Select
chap
or
none
from the authMethod column.
Step 4 Click the
Apply Changes
icon in Cisco DCNM-SAN to save these changes.
To configure the authentication mechanism for iSCSI sessions to a particular interface, follow these steps:
|
|
|
Step 1
|
switch#
config t
switch(config)#
|
Enters configuration mode.
|
Step 2
|
switch(config)#
interface GigabitEthernet 2/1.100
switch(config-if)#
|
Selects the Gigabit Ethernet interface.
|
Step 3
|
switch(config-if)#
iscsi authentication none
|
Specifies that no authentication is required for iSCSI sessions to the selected interface.
|
To configure the authentication mechanism for iSCSI sessions to a particular interface, follow these steps:
Step 1 Choose
Switches
>
Interfaces
>
Gigabit Ethernet
in the Physical Attributes pane.
You see the Gigabit Ethernet configuration in the Information pane.
Step 2 Click the iSNS tab.
You see the iSCSI and iSNS configuration.
Step 3 Right-click on the
IscsiAuthMethod
field and select none or chap.
Step 4 Click the
Apply Changes
icon to save these changes.
Configuring Local Authentication
See the Security Configuration Guide, Cisco DCNM for SANCisco MDS 9000 Family NX-OS Security Guide to create the local password database. To create users in the local password database for the iSCSI initiator, the iSCSI keyword is mandatory.
To configure iSCSI users for local authentication, follow these steps:
|
|
|
Step 1
|
switch#
config t
switch(config)#
|
Enters configuration mode.
|
Step 2
|
switch(config)#
username iscsiuser password ffsffsfsffs345353554535 iscsi
|
Configures a user name (iscsiuser) and password (ffsffsfsffs345353554535) in the local database for iSCSI login authentication.
|
To configure iSCSI users for local authentication using Device Manager, follow these steps:
Step 1 Choose
Security
>
iSCSI
.
You see the iSCSI Security dialog box.
Step 2 Complete the iSCSI User, Password, and Password Confirmation fields.
Step 3 Click
Create
to save this new user.
Restricting iSCSI Initiator Authentication
By default, the iSCSI initiator can use any user name in the RADIUS server or in the local database in authenticating itself to the IPS module or MPS-14/2 module (the CHAP user name is independent of the iSCSI initiator name). The IPS module or MPS-14/2 module allows the initiator to log in as long as it provides a correct response to the CHAP challenge sent by the switch. This can be a problem if one CHAP user name and password has been compromised.
To restrict an initiator to use a specific user name for CHAP authentication, follow these steps:
|
|
|
Step 1
|
switch#
config t
|
Enters configuration mode.
|
Step 2
|
switch(config)#
iscsi initiator name iqn.1987-02.com.cisco.init
switch(config-iscsi-init)#
|
Enters the configuration submode for the initiator iqn.1987-02.com.cisco.init.
|
Step 3
|
switch(config-iscsi-init)#
username user1
|
Restricts the initiator iqn.1987-02.com.cisco.init
to only authenticate using user1 as its CHAP user name.
Tip Be sure to define user1 as an iSCSI user in the local AAA database or the RADIUS server.
|
To restrict an initiator to use a specific user name for CHAP authentication, follow these steps:
Step 1 Choose
End Devices
>
iSCSI
in the Physical Attributes pane.
You see the iSCSI tables in the Information pane.
Step 2 Right-click the AuthUser field and enter the user name to which you want to restrict the iSCSI initiator.
Step 3 Click the
Apply Changes
icon to save these changes.
Configuring Mutual CHAP Authentication
The IPS module or MPS-14/2 module supports a mechanism by which the iSCSI initiator can authenticate the Cisco MDS switch’s iSCSI target during the iSCSI login phase. This authentication is available in addition to the IPS module or MPS-14/2 module authentication of the iSCSI initiator.
In addition to the IPS module or MPS-14/2 module authentication of the iSCSI initiator, the IPS module or MPS-14/2 module also supports a mechanism for the iSCSI initiator to authenticate the Cisco MDS switch’s iSCSI target during the iSCSI login phase. This authentication requires the user to configure a user name and password for the switch to present to the iSCSI initiator. The provided password is used to calculate a CHAP response to a CHAP challenge sent to the IPS port by the initiator.
To configure a global iSCSI target user name and password to be used by the switch to authenticate itself to an initiator, follow these steps:
|
|
|
Step 1
|
switch#
config t
switch(config)#
|
Enters configuration mode.
|
Step 2
|
switch(config)#
iscsi authentication username testuser password abc123
|
Configures the switch user account (testuser) along with a password (abc123) specified in clear text (default) for all initiators. The password is limited to 128 characters.
|
switch(config)#
iscsi authentication username user1 password 7 !@*asdsfsdfjh!@df
|
Configures the switch user account (user1) along with the encrypted password specified by 7 (!@*asdsfsdfjh!@df) for all initiators.
|
switch(config)#
iscsi authentication username user1 password 0 abcd12AAA
|
Configures the switch user account (user1) along with a password (abcd12AAA) specified in clear text (indicated by 0—default) for all initiators. The password is limited to 128 characters.
|
switch(config)#
no iscsi authentication username testuser
|
Removes the global configuration for all initiators.
|
To configure a global iSCSI target user name and password to be used by the switch to authenticate itself to an initiator, follow these steps:
Step 1 Choose FC Interfaces > Logical >
iSCSI
in the Physical Attributes pane.
You see the iSCSI tables in the Information pane.
Step 2 Select the
Globals
tab.
You see the global iSCSI configuration.
Step 3 Fill in the Target UserName and Target Password fields.
Step 4 Click the
Apply Changes
icon to save these changes.
To configure a per-initiator iSCSI target’s user name and password used by the switch to authenticate itself to an initiator, follow these steps:
|
|
|
Step 1
|
switch#
config t
switch(config)#
|
Enters configuration mode.
|
Step 2
|
switch(config)#
iscsi initiator name iqn.1987-02.com.cisco.initiator
switch(config-iscsi-init)#
|
Configures an iSCSI initiator using the iSCSI name of the initiator node.
|
Step 3
|
switch(config-iscsi-init)#
mutual-chap username testuser password abcd12AAA
|
Configures the switch user account (testuser) along with a password (abcd12AAA) specified in clear text (default). The password is limited to 128 characters.
|
switch(config-iscsi-init)#
mutual-chap username user1 password 7 !@*asdsfsdfjh!@df
|
Configures the switch user account (user1) along with the encrypted password specified by 7 (!@*asdsfsdfjh!@df).
|
switch(config-iscsi-init)#
no mutual-chap username testuser
|
Removes the switch authentication configuration.
|
Use the
show running-config
and the
show iscsi global
commands to display the global configuration. Use the
show running-config
and the
show iscsi initiator configured
commands to display the initiator specific configuration.(See the “Displaying iSCSI User Information” section for command output examples).
To configure a per-initiator iSCSI target’s user name and password used by the switch to authenticate itself to an initiator using Device Manager, follow these steps:
Step 1 Choose IP > iSCSI.
You see the iSCSI configuration.
Step 2 Complete the Target UserName and Target Password fields for the initiator that you want to configure.
Step 3 Click
Create
to add this initiator to the Initiator Access List.
Configuring an iSCSI RADIUS Server
To configure an iSCSI RADIUS server, follow these steps:
Step 1 Configure the RADIUS server to allow access from the Cisco MDS switch's management Ethernet IP address.
Step 2 Configure the shared secret for the RADIUS server to authenticate the Cisco MDS switch.
Step 3 Configure the iSCSI users and passwords on the RADIUS server.
Setting QoS Values
To set the QoS values, follow these steps:
|
|
|
Step 1
|
switch(config-if)#
qos 3
|
Configures the differentiated services code point (DSCP) value of 3 to be applied to all outgoing IP packets in this iSCSI interface. The valid range for the iSCSI DSCP value is from 0 to 63.
|
Step 2
|
switch(config-if)#
no qos 5
|
Reverts the switch to its factory default (marks all packets with DSCP value 0).
|
To set the QoS values, follow these steps:
Step 1 Expand
Switches
, expand
FC Interfaces
, and then select
Logical
in the Physical Attributes pane.
You see the Interface tables in the Information pane.
Step 2 In Device Manager, choose
Interface
>
Ethernet and iSCSI
.
You see the Ethernet Interfaces and iSCSI dialog box.
Step 3 Click the
iSCSI TCP
tab in either Cisco DCNM-SAN or Device Manager.
You see the iSCSI TCP configuration table.
Step 4 Set the QoS field from 1 to 6.
Step 5 Click the
Apply Changes
icon in Cisco DCNM-SAN or click
Apply
in Device Manager to save these changes.
Changing the iSCSI Routing Mode
To set the iSCSI routing mode, follow this step:
|
|
|
Step 1
|
switch(config-if)#
mode cut-thru
|
Configures cut-thru mode on the iSCSI interface.
Caution Changing the iSCSI routing mode disrupts the iSCSI sessions on the interface.
|
switch(config-if)#
no mode cut-thru
|
Reverts store-and-forward mode (default).
|
Configuring iSLB
Note For iSLB, all switches in the fabric must be running Cisco MDS SAN-OS Release 2.1(1a) or later.
This section covers the following topics:
Configuring iSLB Using Device Manager
Prerequisites
Perform the following actions prior to configuring iSLB:
To configure iSLB using Device Manager, follow these steps:
Step 1 Choose
IP
>
iSCSI iSLB
.
You see the iSCSI iSLB dialog box.
Step 2 Click
Create
to create a new iSCSI iSLB initiator.
You see the Create iSCSI iSLB Initiators dialog box.
Step 3 Set the Name or IP Address field to the iSLB name or IP address.
Step 4 Set the VSAN Membership field to the VSAN that you want the iSLB initiator in.
Also see the “Assigning VSAN Membership for iSLB Initiators” section.
Step 5 Check the Persistent check box to convert a dynamic nWWN to static for the iSLB initiator.
Also see the “Making the Dynamic iSCSI Initiator WWN Mapping Static” section.
Step 6 (Optional) Check the
SystemAssigned
check box to have the switch assign the nWWN.
Step 7 (Optional) Set the Static WWN field to manually assign the static nWWN. You must ensure uniqueness for this nWWN.
Step 8 (Optional) Check the Port WWN Mapping
Persistent
check box to convert dynamic pWWNs to static for the iSLB initiator.
See the “Making the Dynamic iSCSI Initiator WWN Mapping Static” section.
Step 9 (Optional) Check the
SystemAssigned
check box and set the number of pWWNs you want to have the switch assign the PWWN.
Step 10 (Optional) Set the Static WWN(s) field to manually assign the static pWWNs.
You must ensure uniqueness for these pWWN.
Step 11 (Optional) Set the AuthUser field to the username that you want to restrict the iSLB initiator to for iSLB authentication.
Also see the “Restricting iSLB Initiator Authentication” section.
Step 12 Fill in the Username and Password fields to configure iSLB initiator target CHAP authentication.
Also see the “iSLB Session Authentication” section.
Step 13 In the Initiator Specific Target section, set the pWWN to configure an iSLB initiator target.
Step 14 (Optional) Set the Name field to a globally unique identifier (IQN).
Step 15 (Optional) Check the
NoAutoZoneCreation
check box to disable auto-zoning.
Step 16 (Optional) Check the
TresspassMode
check box.
Also see the “LUN Trespass for Storage Port Failover” section.
Step 17 (Optional) Check the
RevertToPrimary
check box to revert back to the primary port after an HA failover when the primary port comes back up.
Step 18 Set the PrimaryVsan to the VSAN for the iSLB initiator target.
Step 19 Click
Create
to create this iSLB initiator.
Step 20 If CFS is enabled, select
commit
from the CFS drop-down menu.
Configuring iSLB Initiator Names or IP Addresses
You must specify the iSLB initiator name or IP address before configuring it.
Note Specifying the iSLB initiator name or IP address is the same as for an iSCSI initiator. See the “Static Mapping” section.
To enter iSLB initiator configuration submode using the
name
option for an iSLB initiator, follow these steps:
|
|
|
Step 1
|
switch#
config t
switch(config)#
|
Enters configuration mode.
|
Step 2
|
switch(config)#
islb initiator name iqn.1987-02.com.cisco.initiator
switch(config-islb-init)#
|
Configures an iSLB initiator using the iSCSI name of the initiator node (iqn.1987-02.com.cisco.initiator) and enters iSLB initiator configuration submode. The maximum name length is 223 alphanumeric characters. The minimum length is 16.
|
switch(config)#
no lslb initiator name iqn.1987-02.com.cisco.initiator
|
Deletes the configured iSLB initiator.
|
To enter iSLB initiator configuration submode using the
ip-address
option for an iSLB initiator, follow these steps:
|
|
|
Step 1
|
switch#
config terminal
switch(config)#
|
Enters configuration mode.
|
Step 2
|
switch(config)#
islb initiator ip-address 10.1.1.3
switch(config-islb-init)#
|
Configures an iSLB initiator using the IPv4 address of the initiator node and enters iSLB initiator configuration submode.
|
switch(config)#
no islb initiator ip-address 10.1.1.3
|
Deletes the configured iSLB initiator.
|
switch(config)#
islb initiator ip-address 2001:0DB8:800:200C::417A
switch(config-islb-init)#
|
Configures an iSLB initiator using the IPv6 unicast address of the initiator node and enters iSLB initiator configuration submode.
|
switch(config)#
no islb initiator ip-address 2001:0DB8:800:200C::417A
|
Deletes the configured iSLB initiator.
|
Examples
To verify the iSLB initiator configuration, use the
show islb initiator configured
command.
switch# show islb initiator configured iSCSI Node name is 10.1.1.2 Node WWN is 23:02:00:0c:85:90:3e:82 Number of Initiator Targets: 1 Initiator Target: test-targt Port WWN 01:01:01:01:02:02:02:02 Zoning support is enabled Trespass support is disabled Revert to primary support is disabled
Making the Dynamic iSLB Initiator WWN Mapping Static
After a dynamic iSLB initiator has logged in, you may decide to permanently keep the automatically assigned nWWN/pWWN mapping to allow this initiator to use the same mapping the next time it logs in (see the “Dynamic Mapping” section).
You can convert a dynamic iSLB initiator to a static iSLB initiator and make its WWNs persistent.
Restrictions
-
You cannot convert a dynamic iSCSI initiator to a static iSLB initiator or a dynamic iSLB initiator to a static iSCSI initiator (see the “Dynamic Mapping” section on page 4-20) .
-
Making the dynamic mapping for iSLB initiators static is the same as for iSCSI. See the “Making the Dynamic iSCSI Initiator WWN Mapping Static” section.
-
Only statically mapped iSLB initiator configuration is distributed throughout the fabric using CFS. Dynamically and statically configured iSCSI initiator configurations are not distributed.
See the Configuring iSLB Using Device Manager.
To permanently keep the automatically assigned nWWN/pWWN mapping, follow these steps:
|
|
|
Step 1
|
switch#
config terminal
switch(config)#
|
Enters configuration mode.
|
Step 2
|
switch(config)#
islb save-initiator name iqn.1987-02.com.cisco.initiator
|
Saves the nWWNs and pWWNs that have automatically been assigned to the iSLB initiator whose name is specified.
|
switch(config)#
islb save-initiator
10.10.100.11
|
Saves the nWWNs and pWWNs that have automatically been assigned to the iSLB initiator whose IPv4 address is specified.
|
switch(config)#
iscsi save-initiator ip-address 2001:0DB8:800:200C::417A
|
Saves the nWWNs and pWWNs that have automatically been assigned to the iSCSI initiator whose IPv6 unicast address is specified.
|
switch(config)#
islb save-initiator
|
Saves the nWWNs and pWWNs that have automatically been assigned to all the iSLB initiators.
|
Step 3
|
switch(config)#
exit
switch#
|
Returns to EXEC mode.
|
Step 4
|
switch#
copy running-config startup-config
|
Saves the nWWN/pWWN mapping configuration across system reboots.
|
Assigning VSAN Membership for iSLB Initiators
Individual iSLB hosts can be configured to be in a specific VSAN (similar to the DPVM feature for Fibre Channel). The specified VSAN overrides the iSCSI interface VSAN membership.
For more information, see the Fabric Configuration Guide, Cisco DCNM for SAN.
Note Specifying the iSLB initiator VSAN is the same as for an iSCSI initiator. See the VSAN Membership for iSCSI.
To assign VSAN membership for iSLB initiators, follow these steps:
|
|
|
Step 1
|
switch#
config terminal
switch(config)#
|
Enters configuration mode.
|
Step 2
|
switch(config)#
islb initiator ip-address 10.1.1.3
switch(config-islb-init)#
|
Configures an iSLB initiator using its IPv4 address and enters iSLB initiator configuration submode.
|
Step 3
|
switch(config-islb-init)#
vsan 3
|
Assigns the iSLB initiator node to a specified VSAN.
Note You can assign this host to one or more VSANs.
|
switch(config-islb-init)#
no vsan 3
|
Removes the iSLB initiator from the specified VSAN.
|
Note When an iSLB initiator is configured in any other VSAN (other than VSAN 1, the default VSAN), for example VSAN 2, the initiator is automatically removed from VSAN 1. If you also want it to be present in VSAN 1, you must explicitly configure the initiator in VSAN 1.
See the Configuring iSLB Using Device Manager.
Configuring Metric for Load Balancing
You can assign a load metric to each initiator for weighted load balancing. The load calculated is based on the number of initiators on a given iSCSI interface. This feature accommodates initiators with different bandwidth requirements. For example, you could assign a higher load metric to a database server than to a web server. Weighted load balancing also accommodates initiators with different link speeds.
Also, you can configure initiator targets using the device alias or the pWWN. If you configure an IQN for an initiator target, then that name is used to identify the initiator target. Otherwise, a unique IQN is generated for the initiator target.
For more information on load balancing, see the “About Load Balancing Using VRRP” section.
Choose
IP
>
iSCSI iSLB
in Device Manager and set the LoadMetric field to change the load balancing metric for an iSLB initiator.
See the Configuring iSLB Using Device Manager.
To configure a weight for load balancing, follow these steps:
|
|
|
Step 1
|
switch#
config t
switch(config)#
|
Enters configuration mode.
|
Step 2
|
switch(config)#
islb initiator name iqn.1987-02.com.cisco.initiator
switch(config-iscsi-init)#
|
Configures an iSLB initiator using the name of the initiator node and enters iSLB initiator configuration mode.
|
Step 3
|
switch(config-iscsi-init)#
metric 100
|
Assigns 100 as the weight metric for this iSLB initiator.
|
Step 4
|
switch(config-iscsi-init)#
no metric 100
|
Reverts to the default value (1000).
|
Configuring iSLB Initiator Targets
You can configure initiator targets using the device alias or the pWWN. You can also optionally specify one or more of the following optional parameters:
-
Secondary pWWN
-
Secondary device alias
-
LUN mapping
-
IQN
-
VSAN identifier
Note The VSAN identifier is optional if the target is online. If the target is not online, the VSAN identifier is required.
In addition, you can disable auto-zoning.
If you configure an IQN for an initiator target, then that name is used to identify the initiator target. Otherwise, a unique IQN is generated for the initiator target.
To configure iSLB initiator targets, follow these steps:
|
|
|
Step 1
|
switch#
config terminal
switch(config)#
|
Enters configuration mode.
|
Step 2
|
switch(config)#
islb initiator ip-address 10.1.1.3
switch(config-islb-init)#
|
Configures an iSLB initiator using its IPv4 address and enters iSLB initiator configuration submode.
|
Step 3
|
switch(config-iscsi-islb-init)#
target pwwn 26:00:01:02:03:04:05:06
|
Configures the iSLB initiator target using a pWWN with auto-zoning enabled (default).
|
switch(config-iscsi-islb-init)#
target pwwn 26:00:01:02:03:04:05:06 no-zone
|
Configures the iSLB initiator target using a pWWN with auto-zoning disabled.
|
switch(config-iscsi-islb-init)#
target device-alias SampleAlias
|
Configures the iSLB initiator target using a device alias with auto-zoning enabled (default).
|
switch(config-iscsi-islb-init)#
target device-alias SampleAlias fc-lun 0x1234 iscsi-lun 0x2345
|
Configures the iSLB initiator target using a device alias and optional LUN mapping.
Note The CLI interprets the LUN identifier value as a hexadecimal value whether or not the 0x prefix is included.
|
switch(config-iscsi-islb-init)#
target device-alias SampleAlias iqn-name iqn.1987-01.com.cisco.initiator
|
Configures the iSLB initiator target using a device alias and an optional IQN.
|
switch(config-iscsi-islb-init)#
target device-alias SampleAlias sec-device-alias SecondaryAlias
|
Configures the iSLB initiator target using a device alias and an optional secondary device alias.
|
switch(config-iscsi-islb-init)#
target device-alias SampleAlias sec-pwwn 26:01:02:03:04:05:06:07
|
Configures the iSLB initiator target using a device alias and an optional secondary pWWN.
|
switch(config-iscsi-islb-init)#
target device-alias SampleAlias vsan 10
|
Configures the iSLB initiator target using a device alias and the VSAN identifier.
Note The VSAN identifier is optional is if the target is online. If the target is not online, the VSAN identifier is required.
|
switch(config-iscsi-init)#
no target pwwn 26:00:01:02:03:04:05:06
|
Removes the iSLB initiator target.
|
To configure additional iSLB initiator targets using Device Manager, follow these steps:
Step 1 Choose
IP
>
iSCSI iSLB
.
You see the iSCSI iSLB dialog box.
Step 2 Click on the initiator you want to add targets to and click
Edit Initiator Specific Targets
.
You see the Initiator Specific Target dialog box.
Step 3 Click
Create
to create a new initiator target.
You see the Create Initiator Specific Target dialog box.
Step 4 Fill in the pWWN field with the initiator target pWWN.
Step 5 (Optional) Set the Name field to a globally unique identifier (IQN).
Step 6 (Optional) Check the
NoAutoZoneCreation
check box to disable auto-zoning.
Step 7 (Optional) Check the
TresspassMode
check box. See the “LUN Trespass for Storage Port Failover” section.
Step 8 (Optional) Check the
RevertToPrimary
check box to revert back to the primary port after an HA failover when the primary port comes back up.
Step 9 Set the PrimaryVsan to the VSAN for the iSLB initiator target.
Step 10 Click
Create
to create this iSLB initiator target.
Step 11 If CFS is enabled, select
commit
from the CFS drop-down menu.
Configuring and Activating Zones for iSLB Initiators and Initiator Targets
You can configure a zone name where the iSLB initiators and initiator targets are added. If you do not specify a zone name, the IPS manager creates one dynamically.
iSLB zone sets have the following restrictions:
-
Auto-zoning of the initiator with the initiator targets is enabled by default.
-
A zone set must be active in a VSAN for auto-zones to be created in that VSAN.
-
iSLB zone set activation might fail if another zone set activation is in process or if the zoning database is locked. Retry the iSLB zone set activation if a failure occurs. To avoid this problem, only perform only one zoning related operation (normal zones, IVR zones, or iSLB zones) at a time.
-
Auto-zones are created when the zone set is activated and there has been at least one change in the zoneset. The activation has no effect if only the auto-zones have changed.
Caution If IVR and iSLB are enabled in the same fabric, at least one switch in the fabric must have both features enabled. Any zoning related configuration or activation operation (for normal zones, IVR zones, or iSLB zones) must be performed on this switch. Otherwise, traffic might be disrupted in the fabric.
To configure the iSLB initiator optional auto-zone name and activate the zone set, follow these steps:
|
|
|
Step 1
|
switch#
config t
|
Enters configuration mode.
|
Step 2
|
switch(config)#
islb initiator ip-address 10.1.1.3
switch(config-islb-init)#
|
Configures an iSLB initiator using its IPv4 address and enters iSLB initiator configuration submode.
|
Step 3
|
switch(config-islb-init)#
zonename IslbZone
|
Specifies the zone name where the initiators and the initiator targets are added (optional).
|
switch(config-islb-init)#
no zonename IslbZone
|
Removes the initiators and initiator targets from the zone and adds them to a dynamically created zone (default).
|
Step 4
|
switch(config-islb-init)#
exit
|
Returns to configuration mode.
|
Step 5
|
switch(config)#
islb zoneset activate
|
Activates zoning for the iSLB initiators and initiator targets with zoning enabled and creates auto-zones if no zone names are configured.
Note This step is not required if CFS is enabled. CFS automatically activates the zone when the configuration changes are committed.
|
Choose
IP
>
iSCSI iSLB
in Device Manager and set the autoZoneName field to change the auto zone name for an iSLB initiator.
See the Configuring iSLB Using Device Manager.
Examples
The following example shows the
show zoneset active
command output when the dynamically generated zone name is used.
switch# show zoneset active zoneset name zoneset-1 vsan 1 zone name ips_zone_5d9603bcff68008a6fc5862a6670ca09 vsan 1 * fcid 0x010009 [ip-address 10.1.1.3] pwwn 22:00:00:04:cf:75:28:4d pwwn 22:00:00:04:cf:75:ed:53 pwwn 22:00:00:04:cf:75:21:d5 pwwn 22:00:00:04:cf:75:ee:59
The following example shows the
show zoneset active
command output when the configured zone name IslbZone is used.
switch# show zoneset active zoneset name zoneset-1 vsan 1 zone name ips_zone_IslbZone vsan 1 pwwn 22:00:00:04:cf:75:28:4d pwwn 22:00:00:04:cf:75:ed:53 pwwn 22:00:00:04:cf:75:21:d5 pwwn 22:00:00:04:cf:75:ee:59
Restricting iSLB Initiator Authentication
By default, the iSLB initiator can use any user name in the RADIUS or local AAA database in authenticating itself to the IPS module or MPS-14/2 module (the CHAP user name is independent of the iSLB initiator name). The IPS module or MPS-14/2 module allows the initiator to log in as long as it provides a correct response to the CHAP challenge sent by the switch. This can be a problem if one CHAP user name and password have been compromised.
To restrict an initiator to use a specific user name for CHAP authentication, follow these steps:
|
|
|
Step 1
|
switch#
config t
|
Enters configuration mode.
|
Step 2
|
switch(config)#
islb initiator name iqn.1987-02.com.cisco.init
switch(config-islb-init)#
|
Configures an iSLB initiator using the IQN of the initiator node and enters iSLB initiator configuration mode.
|
Step 3
|
switch(config-islb-init)#
username user1
|
Restricts the initiator
iqn.1987-02.com.cisco.init
to only authenticate using
user1
as its CHAP user name.
Tip Be sure to define user1 as an iSCSI user in the local AAA database or the RADIUS server.
|
Choose
IP
>
iSCSI iSLB
in Device Manager and set the AuthName field to restrict an initiator to use a specific user name for CHAP authentication.
See the Configuring iSLB Using Device Manager.
Mutual CHAP Authentication
In addition to the IPS module and MPS-14/2 module authentication of the iSLB initiator, the IPS module and MPS-14/2 module also support a mechanism for the iSLB initiator to authenticate the Cisco MDS switch’s initiator target during the iSCSI login phase. This authentication requires the user to configure a user name and password for the switch to present to the iSLB initiator. The provided password is used to calculate a CHAP response to a CHAP challenge sent to the IPS port by the initiator.
To configure a per-initiator user name and password used by the switch to authenticate itself to an initiator, follow these steps:
|
|
|
Step 1
|
switch#
config t
switch(config)#
|
Enters configuration mode.
|
Step 2
|
switch(config)#
islb initiator name iqn.1987-02.com.cisco.initiator
switch(config-islb-init)#
|
Configures an iSLB initiator using the name of the initiator node and enters iSLB initiator configuration mode.
|
Step 3
|
switch(config-islb-init)#
mutual-chap username testuser password dcba12LKJ
|
Configures the switch user account (testuser) along with a password (dcba12LKJ) specified in clear text (default). The password is limited to 128 characters.
|
switch(config-islb-init)#
mutual-chap username testuser password 7 !@*asdsfsdfjh!@df
|
Configures the switch user account (testuser) along with the encrypted password specified by 7 (!@*asdsfsdfjh!@df).
|
Step 4
|
switch(config-iscsi-init)#
no mutual-chap username testuser
|
Removes the switch authentication configuration.
|
Choose
IP
>
iSCSI iSLB
in Device Manager and set the Target Username and Target Password fields to configure a per-initiator user name and password used by the switch to authenticate itself to an initiator.
See the Configuring iSLB Using Device Manager.
Examples
Use the
show running-config
and the
show iscsi global
(see Example 40-6) commands to display the global configuration. Use the
show running-config
and the
show islb initiator configured
(see Example 40-14
)
commands to display the initiator specific configuration.
To verify the iSLB user name and mutual CHAP configuration, use the
show islb initiator configured
command.
switch# show islb initiator configured iSCSI Node name is 10.1.1.3 User Name for login authentication: user1 User Name for Mutual CHAP: testuser Load Balance Metric: 1000 Number of Initiator Targets: 1 Number of Initiator Targets: 1 Initiator Target: iqn.1987-05.com.cisco:05.ips-hac4 Port WWN 50:06:04:82:ca:e1:26:8d iSCSI LUN: 0x0001, FC LUN: 0x0001 iSCSI LUN: 0x0002, FC LUN: 0x0002 iSCSI LUN: 0x0003, FC LUN: 0x0003
Configuring Load Balancing Using VRRP
You must first configure VRRP on the Gigabit Ethernet interfaces on the switch that connect to the IP network before configuring VRRP for iSLB.
To configure VRRP load balancing using Device Manager, follow these steps:
Step 1 Choose
IP
>
iSCSI iSLB
.
You see the iSCSI iSLB dialog box.
Step 2 Click the
VRRP
tab.
Step 3 Click
Create
to configure VRRP load balancing for iSLB initiators.
You see the Create iSCSI iSLB VRRP dialog box.
Step 4 Set the Vrld to the VRRP group number.
Step 5 Select either
ipv4
or
ipv6
and check the LoadBalance check box.
Step 6 Click
Create
to enable load balancing.
Step 7 If CFS is enabled, select
commit
from the CFS drop-down menu.
Enabling VRRP for Load Balancing
To enable or disable VRRP for iSLB, follow these steps:
|
|
|
Step 1
|
switch#
config t
switch(config)#
|
Enters configuration mode.
|
Step 2
|
switch(config)#
islb vrrp 10 load-balance
|
Enables iSLB VRRP for IPv4 VR group 10.
|
Step 3
|
switch(config)#
no islb vrrp 10 load-balance
|
Disables iSLB VRRP for IPv4 VR group 10.
|
Step 4
|
switch(config)#
islb vrrp ipv6 20 load-balance
|
Enables iSLB VRRP for IPv6 VR group 20.
|
Step 5
|
switch(config)#
no islb vrrp ipv6 20 load-balance
|
Disables iSLB VRRP for IPv6 VR group 20.
|
Examples
To verify the iSLB VRRP load balancing configuration for IPv4, use the
show vrrp vr
command.
Interface VR IpVersion Pri Time Pre State VR IP addr --------------------------------------------------------------------------- GigE1/5 1 IPv4 100 1 s master 10.10.10.1 GigE1/6 1 IPv4 100 1 s master 10.10.10.1
To verify the iSLB VRRP load balancing configuration for IPv6, use the
show vrrp ipv6 vr
command.
switch# show vrrp ipv6 vr 1 Interface VR IpVersion Pri Time Pre State VR IP addr -------------------------------------------------------------------- GigE6/2 1 IPv6 100 100cs master 5000:1::100 PortCh 4 1 IPv6 100 100cs master 5000:1::100
Configuring iSCSI Authentication
This section provides configuration information on iSCSI authenticatio. It includes the following authentication procedures:
Note This section does not specify the steps to enter or exit EXEC mode, configuration mode, or any submode. Be sure to verify the prompt before entering any command.
Configuring No Authentication
To configure a network with no authentication, set the iSCSI authentication method to
none
In Cisco DCNM-SAN, choose
End Devices
>
iSCSI
in the Physical Attributes pane. Select the
Globals
tab and set the AuthMethod drop-down menu to
none
and click
Apply Changes
.
switch(config)# iscsi authentication none
Configuring CHAP with Local Password Database
To configure authentication using the CHAP option with the local password database, follow these steps:
Step 1 Set the AAA authentication to use the local password database for the iSCSI protocol.
switch(config)# aaa authentication iscsi default local
Step 2 Set the iSCSI authentication method to require CHAP for all iSCSI clients.
switch(config)# iscsi authentication chap
Step 3 Configure the user names and passwords for iSCSI users.
switch(config)# username iscsi-user password abcd iscsi
Note If you do not specify the iscsi option, the user name is assumed to be a Cisco MDS switch user instead of an iSCSI user.
Step 4 Verify the global iSCSI authentication setup.
switch# show iscsi global iSCSI Global information Authentication: CHAP <----Verify Import FC Target: Disabled
To configure authentication using the CHAP option with the local password database, follow these steps:
Step 1 Set the AAA authentication to use the local password database for the iSCSI protocol:
a. In Cisco DCNM-SAN, choose
Switches
>
Security
>
AAA
in the Physical Attributes pane.
b. Click the
Applications
tab in the Information pane.
c. Check the
Local
check box for the iSCSI row and click
Apply Changes
Step 2 Set the iSCSI authentication method to require CHAP for all iSCSI clients:
a. In Cisco DCNM-SAN, choose
End Devices
>
iSCSI
in the Physical Attributes pane.
b. Click the
Globals
tab in the Information pane.
c. Set the AuthMethod drop-down menu to
chap
and click
Apply Changes
.
Step 3 Configure the user names and passwords for iSCSI users:
a. In Device Manager, choose
Security
>
iSCSI
.
b. Set the Username, Password and Confirm Password fields.
c. Click
Create
to save these changes.
Step 4 Verify the global iSCSI authentication setup:
a. In Cisco DCNM-SAN, choose
End Devices
>
iSCSI
in the Physical Attributes pane.
b. Click the
Globals
tab in the Information pane.
Configuring CHAP with External RADIUS Server
To configure authentication using the CHAP option with an external RADIUS server, follow these steps:
Step 1 Configure the password for the Cisco MDS switch as RADIUS client to the RADIUS server
switch(config)# radius-server key mds-1
Step 2 Configure the RADIUS server IP address by performing one of the following:
-
Configure an IPv4 address.
switch(config)# radius-server host 10.1.1.10
-
Configure an IPv6 address.
switch(config)# radius-server host 2001:0DB8:800:200C::417A
Step 3 Configure the RADIUS server group IP address by performing one of the following:
-
Configure an IPv4 address.
switch(config)# aaa group server radius iscsi-radius-group switch(config-radius)# server 10.1.1.1
-
Configure an IPv6 address.
switch(config)# aaa group server radius iscsi-radius-group switch(config-radius)# server 001:0DB8:800:200C::4180 switch(config)# aaa authentication iscsi default group iscsi-radius-group
Step 4 Set up the iSCSI authentication method to require CHAP for all iSCSI clients.
switch(config)# iscsi authentication chap
Step 5 Verify that the global iSCSI authentication setup is for CHAP.
switch# show iscsi global Authentication: CHAP <---------------- Verify CHAP
Step 6 Verify that the AAA authentication information is for iSCSI.
switch# show aaa authentication iscsi: group iscsi-radius-group <--------- Group name switch# show radius-server groups following RADIUS server groups are configured: server: all configured radius servers group iscsi-radius-group: server: 10.1.1.1 on auth-port 1812, acct-port 1813 switch# show radius-server Global RADIUS shared secret:mds-1 <-------- Verify secret following RADIUS servers are configured: 10.1.1.1: <----------- Verify the server IPv4 address available for authentication on port:1812 available for accounting on port:1813
Step 1 Configure the password for the Cisco MDS switch as RADIUS client to the RADIUS server:
a. In Cisco DCNM-SAN, choose
Switches
>
Security
>
AAA
>
RADIUS
in the Physical Attributes pane.
b. Click the
Default
tab in the Information pane.
c. Set the AuthKey field to the default password and click the
Apply Changes
icon.
Step 2 Configure the RADIUS server IP address:
a. In Cisco DCNM-SAN, choose
Switches
>
Security
>
AAA
>
RADIUS
in the Physical Attributes pane.
b. Click the
Server
tab in the Information pane and click
Create Row
.
c. Set the Index field to a unique number.
d. Set the IP Type radio button to
ipv4
or
ipv6
.
e. Set the Name or IP Address field to the IP address of the RADIUS server and click
Create
.
Step 3 Create a RADIUS server group and add the RADIUS server to the group:
a. In Cisco DCNM-SAN, choose
Switches
>
Security
>
AAA
in the Physical Attributes pane.
b. Select the
Server Groups
tab in the Information pane and click
Create Row
.
c. Set the Index field to a unique number.
d. Set the Protocol radio button to
radius
.
e. Set the Name field to the server group name.
f. Set the ServerIDList to the index value of the RADIUS server (as created in Step 2 c.) and click
Create
.
Step 4 Set up the authentication verification for the iSCSI protocol to go to the RADIUS server.
a. In Cisco DCNM-SAN, choose
Switches
>
Security
>
AAA
in the Physical Attributes pane.
b. Click the
Applications
tab in the Information pane.
c. Right-click on the iSCSI row in the Type, SubType, Function column.
d. Set the ServerGroup IDList to the index value of the Server Group (as created in Step 3 c) and click
Create
.
Step 5 Set up the iSCSI authentication method to require CHAP for all iSCSI clients.
a. In Cisco DCNM-SAN, choose
End Devices
>
iSCSI
in the Physical Attributes pane.
b. Select
chap
from the AuthMethod drop-down menu.
c. Click the
Apply Changes
icon.
Step 6 In Cisco DCNM-SAN, choose
End Devices
>
iSCSI
in the Physical Attributes pane.
Step 7 Click the Globals tab in the Information pane to verify that the global iSCSI authentication setup is for CHAP.
Step 8 In Cisco DCNM-SAN, choose
Switches
>
Security
>
AAA
in the Physical Attributes pane.
Step 9 Click the
Applications
tab in the Information pane to verify the AAA authentication information for iSCSI.
To configure an iSCSI RADIUS server, follow these steps:
Step 1 Configure the RADIUS server to allow access from the Cisco MDS switch's management Ethernet IP address.
Step 2 Configure the shared secret for the RADIUS server to authenticate the Cisco MDS switch.
Step 3 Configure the iSCSI users and passwords on the RADIUS server.
Creating an iSNS Client Profile
To create an iSNS profile, follow these steps:
|
|
|
Step 1
|
switch#
config t
switch(config)#
|
Enters configuration mode.
|
Step 2
|
switch(config)#
isns profile name MyIsns
switch(config-isns-profile)#
|
Creates a profile called MyIsns.
|
Step 3
|
switch(config-isns-profile)#
server 10.10.100.211
|
Specifies an iSNS server IPv4 address for this profile.
|
Step 4
|
switch(config-isns-profile)#
no
server 10.10.100.211
|
Removes a configured iSNS server from this profile.
|
Step 5
|
switch(config-isns-profile)#
server 2003::11
|
Specifies an iSNS server IPv6 address for this profile.
|
Step 6
|
switch(config-isns-profile)#
no
server 10.20.100.211
|
Removes a configured iSNS server from this profile.
|
To create an iSNS profile, follow these steps:
Step 1 Choose End Devices > iSCSI in the Physical Attributes pane.
You see the iSCSI configuration in the Information pane.
Step 2 Select the iSNS tab.
Step 3 You see the iSNS profiles configured.
Step 4 Click the Create Row icon.
You see the Create iSNS Profiles dialog box.
Step 5 Set the ProfileName field to the iSNS profile name that you want to create.
Step 6 Set the ProfileAddr field to the IP address of the iSNS server.
Step 7 Click
Create
to save these changes.
To remove an iSNS profile, follow these steps:
|
|
|
Step 1
|
switch#
config t
switch(config)#
|
Enters configuration mode.
|
Step 2
|
switch(config)#
no
isns profile name OldIsns
|
Removes a configured iSNS profile called OldIsns.
|
To delete an iSNS profile, follow these steps:
Step 1 Choose End Devices > iSCSI from the Physical Attributes pane.
You see the iSCSI configuration in the Information pane.
Step 2 Select the iSNS tab.
You see the iSNS profiles configured.
Step 3 Right-click the profile that you want to delete and click the Delete Row icon.
To tag a profile to an interface, follow these steps:
|
|
|
Step 1
|
switch#
config t
switch(config)#
|
Enters configuration mode.
|
Step 2
|
switch(config)#
interface gigabitethernet 4/1
switch(config-if)#
|
Configures the specified Gigabit Ethernet interface.
|
Step 3
|
switch(config-if)#
isns MyIsns
|
Tags a profile to an interface.
|
To tag a profile to an interface, follow these steps:
Step 1 Choose
Switches
>
Interfaces
>
Gigabit Ethernet
in the Physical Attributes pane.
You see the Gigabit Ethernet configuration in the Information pane.
Step 2 Click the
iSNS
tab.
You see the iSNS profiles configured for these interfaces.
Step 3 Set the iSNS ProfileName field to the iSNS profile name that you want to add to this interface.
Step 4 Click the
Apply Changes
icon to save these changes.
To untag a profile from an interface, follow these steps:
|
|
|
Step 1
|
switch#
config t
switch(config)#
|
Enters configuration mode.
|
Step 2
|
switch(config)#
interface gigabitethernet 5/1
switch(config-if)#
|
Configures the specified Gigabit Ethernet interface.
|
Step 3
|
switch(config-if)#
no
isns OldIsns
|
Untags a profile from an interface.
|
Use the
isns reregister
command in EXEC mode to reregister associated iSNS objects with the iSNS server.
switch# isns reregister gigabitethernet 1/4 switch# isns reregister port-channel 1
To untag a profile from an interface using Cisco DCNM-SAN, follow these steps:
Step 1 Choose
Switches
>
Interfaces
>
Gigabit Ethernet
in the Physical Attributes pane.
You see the Gigabit Ethernet Configuration in the Information pane.
Step 2 Click the
iSNS
tab.
You see the iSNS profiles configured for these interfaces.
Step 3 Right-click the iSNS ProfileName field that you want to untag and delete the text in that field.
Step 4 Click the
Apply Changes
icon to save these changes.
Configuring iSNS Servers
This section describe how to configure an iSNS server on a Cisco MDS 9000 Family switch.
This section includes the following topics:
Enabling the iSNS Server
Before the iSNS server feature can be enabled, iSCSI must be enabled (see the “Enabling iSCSI” section). When you disable iSCSI, iSNS is automatically disabled. When the iSNS server is enabled on a switch, every IPS port whose corresponding iSCSI interface is up is capable of servicing iSNS registration and query requests from external iSNS clients.
To enable the iSNS server, follow these steps:
|
|
|
Step 1
|
switch#
config t
switch(config)#
|
Enters configuration mode.
|
Step 2
|
switch(config)#
isns-server enable
|
Enables the iSNS server.
|
switch(config)#
no
isns-server enable
|
Disables (default) the iSNS server.
|
To enable the iSNS server, follow these steps:
Step 1 Choose
End Devices
>
iSNS
.
You see the iSNS configuration in the Information pane.
Step 2 Click the
Control
tab and select
enable
from the Command drop-down menu for the iSNS server feature.
Step 3 Click the Apply Changes icon to save this change.
Note If you are using VRRP IPv4 addresses for discovering targets from iSNS clients, ensure that the IP address is created using the secondary option (see “Virtual Router Initiation” section).
iSNS Configuration Distribution
You can use the CFS infrastructure to distribute the iSCSI initiator configuration to iSNS servers across the fabric. This allows the iSNS server running on any switch to provide a querying iSNS client a list of iSCSI devices available anywhere on the fabric. For information on CFS, see the System Management Configuration Guide, Cisco DCNM for SANCisco MDS 9000 Family NX-OS System Management Configuration Guide.
To enable iSNS configuration distribution using, follow these steps:
|
|
|
Step 1
|
switch#
config t
switch(config)#
|
Enters configuration mode.
|
Step 2
|
switch(config)#
isns distribute
|
Uses the CFS infrastructure to distribute the iSCSI virtual target configuration to all switches in the fabric.
|
switch(config)#
no
isns distribute
|
Stops (default) the distribution of iSCSI virtual target configuration to all switches in the fabric.
|
To enable iSNS configuration distribution, follow these steps:
Step 1 Choose
End Devices
>
iSNS
.
You see the iSNS configuration in the Information pane.
Step 2 Click the
CFS
tab and select
enable
from the Admin drop-down menu for iSNS.
Step 3 Select
enable
from the Global drop-down menu for iSNS.
Step 4 Click the
Apply Changes
icon to save this change.
Configuring the ESI Retry Count
The iSNS client registers information with its configured iSNS server using an iSNS profile. At registration, the client can indicate an entity status inquiry (ESI) interval of 60 seconds or more. If the client registers with an ESI interval set to zero (0), then the server does not monitor the client using ESI. In such cases, the client’s registrations remain valid until explicitly deregistered or the iSNS server feature is disabled.
The ESI retry count is the number of times the iSNS server queries iSNS clients for their entity status. The default ESI retry count is 3. The client sends the server a response to indicate that it is still alive. If the client fails to respond after the configured number of retries, the client is deregistered from the server.
To configure the ESI retry count for an iSNS server, follow these steps:
|
|
|
Step 1
|
switch#
config t
switch(config)#
|
Enters configuration mode.
|
Step 2
|
switch(config)#
isns esi retries 6
|
Configures the ESI to retry contacting the client up to 6 times. The range is 1 to 10.
|
switch(config)#
no isns esi retries 6
|
Reverts to the default value of 3 retries.
|
Configuring the Registration Period
The iSNS client specifies the registration period with the iSNS Server. The iSNS Server keeps the registration active until the end of this period. If there are no commands from the iSNS client during this period, then the iSNS server removes the client registration from its database.
If the iSNS client does not specify a registration period, the iSNS server assumes a default value of 0, which keeps the registration active indefinitely. You can also manually configure the registration period on the MDS iSNS Server.
To configure the registration period on an iSNS Server, follow these steps:
|
|
|
Step 1
|
switch#
config t
switch(config)#
|
Enters configuration mode.
|
Step 2
|
switch(config)#
isns registration period 300
|
Configures the registration to be active for 300 seconds. The permissible registration period is between 0 to 65536 seconds.
|
switch(config)#
no isns registration period
|
Reverts to the client registered timeout value, or the default value of 0.
|
To configure the registration period on an iSNS Server, follow these steps:
Step 1 Choose E
nd Devices
>
iSNS
.
You see the iSNS configuration in the Information pane.
Step 2 Click the Servers tab.
You see the configured iSNS servers.
Step 3 Set the
ESI NonResponse Threshold
field to the ESI retry count value.
Step 4 Click the
Apply Changes
icon to save this change.
Verifying iSCSI Configuration
To display iSCSI configuration information, perform one of the following tasks:
|
|
show interface iscsi 4/1
|
Displays the iSCSI Interface Information
|
show iscsi stats iscsi 2/1
|
Display brief iSCSI statistics for an iSCSI interface.
|
show iscsi stats iscsi 2/1 detail
|
Displays detailed iSCSI statistics for the iSCSI interface.
|
show interface iscsi 4/1
|
Displays proxy initiator information for the iSCSI interface with system-assigned WWNs.
|
show interface iscsi 4/2
|
Displays proxy initiator information for the iSCSI interface with user-assigned WWNs.
|
show iscsi global
|
Displays the current global iSCSI configuration and date.
|
show iscsi session.
|
Displays brief information of all iSCSI sessions.
|
show iscsi session initiator 10.10.100.199 target VT1
|
Displays brief information about the specified iSCSI ession.
|
show iscsi session initiator 10.10.100.199 target VT1 detail
|
Displays detailed information about the specified iSCSI session.
|
switch# show iscsi initiator
|
Displays information about connected iSCSI initiators.
|
show iscsi initiator iqn.1987-05.com.cisco:02.3021b0f2fda0.avanti12-w2k detail
|
Displays detailed information about the iSCSI initiator.
|
show fcns database
|
Displays the FCNS database contents.
|
show fcns database detail.
|
Displays the FCNS database in detail.
|
show iscsi initiator configured
|
Displays information about configured initiators.
|
show iscsi virtual-target
|
Displays exported targets.
|
show user-account iscsi
|
Displays iSCSI user names.
|
show islb initiator configured
|
Verifies the iSLB initiator configuration.
|
show islb initiator configured
|
Verifies the iSLB target configuration.
|
show zoneset active
|
Shows the show zoneset active command output when the dynamically generated zone name is used.
|
show zoneset active
|
Shows the show zoneset active command output when the configured zone name IslbZone is used.
|
show islb initiator configured
|
Verifies the iSLB user name and mutual CHAP configuration.
|
show vrrp vr 1
|
Verifies the iSLB VRRP load balancing configuration for IPv4.
|
show vrrp ipv6 vr 1
|
Verifies the iSLB VRRP load balancing configuration for IPv6.
|
show islb vrrp summary vr 30
|
Displays VRRP load balancing information.
|
show islb pending
|
Displays the pending configuration changes.
|
show islb pending-diff
|
Displays the differences between the pending configuration and the current configuration.
|
show islb status
|
Displays the iSLB CFS status.
|
show islb cfs-session status
|
Displays the status of the iSLB CFS distribution session.
|
show islb merge status
|
Displays the iSLB CFS merge status.
|
show isns profile
|
Displays information for configured iSNS profiles.
|
show isns profile ABC
|
Displays a specified iSNS profile.
|
show isns profile counters
|
Displays configured profiles with iSNS statistics.
|
show isns profile ABC counters
|
Displays iSNS statistics for a specified profile.
|
show isns query ABC gigabitethernet 2/3
|
Displays iSNS queries.
|
show interface gigabitethernet 2/3
|
Displays tagged iSNS interfaces.
|
show isns config
|
Displays the iSNS server configuration of ESI interval and database contents.
|
show isns database
|
Displays explicitly registered objects.
|
show isns database full
|
Displays the full database with both registered and configured nodes and portal.
|
show isns database virtual-targets local
|
Displays the virtual target information in the local switch.
|
show isns database virtual-targets switch 20:00:00:0d:ec:01:04:40
|
Displays virtual target for a specified switch.
|
show isns node all
|
Displays explicitly registered objects.
|
show isns node name iqn.com.cisco.disk1
|
Displays the specified node.
|
show isns node all detail
|
Displays the attribute details for all nodes.
|
show isns portal all
|
Displays the attribute information for all portals.
|
show isns portal all detail
|
Displays detailed attribute information for all portals.
|
show isns portal virtual
|
Displays virtual portals.
|
show isns portal virtual switch 20:00:00:0d:ec:01:04:40
|
Displays virtual portals for the specified switch.
|
show isns portal virtual switch 20:00:00:0d:ec:01:04:40 detail
|
Displays detailed information for the virtual portals in the specified switch.
|
show isns entity
|
Displays all registered entries.
|
show isns entity all
|
Displays all entities in the database.
|
show isns entity id dp-204
|
Displays the entity with the specified ID.
|
show isns entity all detail
|
Displays detailed information for all entities in the database.
|
show isns entity virtual
|
Displays the virtual entities.
|
show isns iscsi global config switch 20:00:00:05:ec:01:04:00
|
Displays the import target settings for the specified switch.
|
show isns iscsi global config all
|
Displays the import target settings for all switches
|
show cfs peers name isns
|
Displays the CFS peer switch information for the iSNS application.
|
show cloud discovery status
|
Verifies the status of the cloud discovery operation.
|
show cloud membership all
|
Verifies the cloud membership for the switch.
|
show cloud membership unresolved
|
Verifies the unresolved membership on the switch.
|
show cloud discovery statistics
|
Displays the statistics for the cloud discovery operation.
|
show cloud discovery config
|
Shows cloud discovery config command.
|
show islb vrrp summary
|
Shows the initial load distribution for three initiators with the default load metric value.
|
Use the
show iscsi
command to obtain detailed information about iSCSI configurations.
This section includes the following topics:
Displaying iSCSI Interfaces
Use the
show iscsi interface
command to view the summary, counter, description, and status of the iSCSI interface. Use the output to verify the administrative mode, the interface status, TCP parameters currently used, and brief statistics.
Example 40-1 Displays the iSCSI Interface Information
switch# show interface iscsi 4/1 Hardware is GigabitEthernet Port WWN is 20:cf:00:0c:85:90:3e:80 iSCSI initiator is identified by name Number of iSCSI session: 0 (discovery session: 0) Number of TCP connection: 0 Configured TCP parameters PMTU discover is enabled, reset timeout is 3600 sec Keepalive-timeout is 60 sec Minimum-retransmit-time is 300 ms Maximum allowed bandwidth is 1000000 kbps Minimum available bandwidth is 70000 kbps Estimated round trip time is 1000 usec Send buffer size is 4096 KB Congestion window monitoring is enabled, burst size is 50 KB Configured maximum jitter is 500 us Forwarding mode: store-and-forward TMF Queueing Mode : disabled Proxy Initiator Mode : disabled 5 minutes input rate 0 bits/sec, 0 bytes/sec, 0 frames/sec 5 minutes output rate 0 bits/sec, 0 bytes/sec, 0 frames/sec Command 0 pdus, Data-out 0 pdus, 0 bytes Output 0 packets, 0 bytes Response 0 pdus (with sense 0), R2T 0 pdus
Displaying iSCSI Statistics
Use the
show iscsi stats
command to view brief or detailed iSCSI statistics per iSCSI interface. See Example 40-2 and Example 40-3.
Example 40-2 displays iSCSI throughput on an IPS port in both inbound and outbound directions. It also displays the number of different types of iSCSI PDU received and transmitted by this IPS port.
Example 40-2 Display Brief iSCSI Statistics for an iSCSI Interface
switch# show iscsi stats iscsi 2/1 5 minutes input rate 704 bits/sec, 88 bytes/sec, 1 frames/sec 5 minutes output rate 704 bits/sec, 88 bytes/sec, 1 frames/sec 974756 packets input, 142671620 bytes Command 2352 pdus, Data-out 44198 pdus, 92364800 bytes, 0 fragments, unsolicited 0 bytes output 1022920 packets, 143446248 bytes Response 2352 pdus (with sense 266), R2T 1804 pdus Data-in 90453 pdus, 92458248 bytes
Example 40-3 displays detailed iSCSI statistics for an IPS port. Along with the traffic rate and the number of each iSCSI PDU type, it shows the number of FCP frames received and forwarded, the number of iSCSI login attempts, successes, and failures. It also shows the number of different types of iSCSI PDUs sent and received that are noncritical or occur less frequently, such as NOP in and out (NOP-In and NOP-Out), text request and response (Text-REQ and Text-RESP), and task management request and response (TMF-REQ and TMF-RESP).
Various types of errors and PDU or frame drop occurrences are also counted and displayed. For example, Bad header digest shows the number of iSCSI PDUs received that have a header digest that fails CRC verification. The iSCSI Drop section shows the number of PDUs that were dropped because of reasons such as target down, LUN mapping fail, Data CRC error, or unexpected Immediate or Unsolicited data. These statistics are helpful for debugging purposes when the feature is not working as expected.
The last section, Buffer Stats, gives statistics on the internal IPS packet buffer operation. This section is for debugging purposes only.
Example 40-3 Displays Detailed iSCSI Statistics for the iSCSI Interface
switch# show iscsi stats iscsi 2/1 detail 5 minutes input rate 704 bits/sec, 88 bytes/sec, 1 frames/sec 5 minutes output rate 704 bits/sec, 88 bytes/sec, 1 frames/sec 974454 packets input, 142656516 bytes Command 2352 pdus, Data-out 44198 pdus, 92364800 bytes, 0 fragments, unsolicited 0 bytes output 1022618 packets, 143431144 bytes Response 2352 pdus (with sense 266), R2T 1804 pdus Data-in 90453 pdus, 92458248 bytes Command:2352 PDUs (Rcvd:2352) Data-Out (Write):16236 PDUs (Rcvd 44198), 0 fragments, 92364800 bytes, unsolicited 0 bytes Xfer_rdy:1804 (Rcvd:1804) Data-In:90453 (Rcvd:90463), 92458248 bytes Response:2352 (Rcvd:2362), with sense 266 Login:attempt:13039, succeed:110, fail:12918, authen fail:0 Rcvd:NOP-Out:914582, Sent:NOP-In:914582 TMF-REQ:0, Sent:TMF-RESP:0 Text-REQ:18, Sent:Text-RESP:27 Unrecognized Opcode:0, Bad header digest:0 Command in window but not next:0, exceed wait queue limit:0 Received PDU in wrong phase:0 Immediate data failure::Separation:0 Unsolicited data failure::Separation:0, Segment:0 Sequence ID allocation failure:0 Received:96625 (Error:0, Unknown:0) Sent:PLOGI:10, Rcvd:PLOGI_ACC:10, PLOGI_RJT:0 PRLI:10, Rcvd:PRLI_ACC:10, PRLI_RJT:0, Error:0, From initiator:0 LOGO:4, Rcvd:LOGO_ACC:0, LOGO_RJT:0 PRLO:4, Rcvd:PRLO_ACC:0, PRLO_RJT:0 Self orig command:10, Rcvd:data:10, resp:10 Rcvd:PLOGI:156, Sent:PLOGI_ACC:0, PLOGI_RJT:156 LOGO:0, Sent:LOGO_ACC:0, LOGO_RJT:0 PRLI:8, Sent:PRLI_ACC:8, PRLI_RJT:0 PRLO:0, Sent:PRLO_ACC:0, PRLO_RJT:0 ADISC:0, Sent:ADISC_ACC:0, ADISC_RJT:0 Command:Target down 0, Task in progress 0, LUN map fail 0 CmdSeqNo not in window 0, No Exchange ID 0, Reject 0 Data-Out:0, Data CRC Error:0 Unsolicited data:0, Immediate command PDU:0 Xfer_rdy:0, Data-In:0, Response:0 Buffer less than header size:0, Partial:45231, Split:322 Pullup give new buf:0, Out of contiguous buf:0, Unaligned m_data:0
Displaying Proxy Initiator Information
If the proxy initiator feature is enabled in the iSCSI interface, use the
show interface iscsi
command to display configured proxy initiator information (see Example 40-4 and Example 40-5).
Example 40-4 Displays Proxy Initiator Information for the iSCSI Interface with System-Assigned WWNs
switch# show interface iscsi 4/1 Hardware is GigabitEthernet Port WWN is 20:c1:00:05:30:00:a7:9e iSCSI initiator is identified by name Number of iSCSI session: 0, Number of TCP connection: 0 Configured TCP parameters PMTU discover is enabled, reset timeout is 3600 sec Keepalive-timeout is 60 sec Minimum-retransmit-time is 300 ms Forwarding mode: pass-thru TMF Queueing Mode : disabled Proxy Initiator Mode : enabled<----------------------------Proxy initiator is enabled nWWN is 28:00:00:05:30:00:a7:a1 (system-assigned)<----System-assigned nWWN pWWN is 28:01:00:05:30:00:a7:a1 (system-assigned)<---- System-assigned pWWN 5 minutes input rate 0 bits/sec, 0 bytes/sec, 0 frames/sec 5 minutes output rate 0 bits/sec, 0 bytes/sec, 0 frames/sec Input 7 packets, 2912 bytes Command 0 pdus, Data-out 0 pdus, 0 bytes Output 7 packets, 336 bytes Response 0 pdus (with sense 0), R2T 0 pdus
Example 40-5 Displays Proxy Initiator Information for the iSCSI Interface with User-Assigned WWNs
switch# show interface iscsi 4/2 Hardware is GigabitEthernet Port WWN is 20:c1:00:05:30:00:a7:9e iSCSI initiator is identified by name Number of iSCSI session: 0, Number of TCP connection: 0 Configured TCP parameters PMTU discover is enabled, reset timeout is 3600 sec Keepalive-timeout is 60 sec Minimum-retransmit-time is 300 ms Forwarding mode: pass-thru TMF Queueing Mode : disabled Proxy Initiator Mode : enabled nWWN is 11:11:11:11:11:11:11:11 (manually-configured)<----User-assigned nWWN pWWN is 22:22:22:22:22:22:22:22 (manually-configured)<----User-assigned pWWN 5 minutes input rate 0 bits/sec, 0 bytes/sec, 0 frames/sec 5 minutes output rate 0 bits/sec, 0 bytes/sec, 0 frames/sec Input 7 packets, 2912 bytes Command 0 pdus, Data-out 0 pdus, 0 bytes Output 7 packets, 336 bytes Response 0 pdus (with sense 0), R2T 0 pdus
Displaying Global iSCSI Information
Use the
show iscsi global
command to view the overall configuration and the iSCSI status. See Example 40-6.
Example 40-6 Displays the Current Global iSCSI Configuration and State
switch# show iscsi global Authentication: CHAP, NONE Import FC Target: Enabled Initiator idle timeout: 300 seconds Failed session: 0, Last failed initiator name:
Displaying iSCSI Sessions
Use the
show iscsi session
command to view details about the current iSCSI sessions in the switch. Without parameters, this command displays all sessions. The output can be filtered by specifying an initiator, a target, or both.
Example 40-7 displays one iSCSI initiator configured based on the IQN (iqn.1987-05.com.cisco:02.3021b0f2fda0.avanti12-w2k) and another based on its IPv4 address (10.10.100.199).
Example 40-7 Displays Brief Information of All iSCSI Sessions
switch# show iscsi session Initiator iqn.1987-05.com.cisco:02.3021b0f2fda0.avanti12-w2k Initiator ip addr (s): 10.10.100.116 Discovery session, ISID 00023d000043, Status active VSAN 1, ISID 00023d000046, Status active, no reservation VSAN 1, ISID 00023d000048, Status active, no reservation Initiator name iqn.1987-05.com.cisco.01.7e3183ae458a94b1cd6bc168cba09d2e VSAN 1, ISID 246700000000, Status active, no reservation VSAN 1, ISID 246b00000000, Status active, no reservation Target iqn.1987-05.com.cisco:05.switch.04-01.2100002037a6be32 VSAN 1, ISID 246e00000000, Status active, no reservation
Example 40-8 and Example 40-9 display the iSCSI initiator configured based on its IPv4 address (10.10.100.199).
Example 40-8 Displays Brief Information About the Specified iSCSI Session
switch# show iscsi session initiator 10.10.100.199 target VT1 Initiator name iqn.1987-05.com.cisco.01.7e3183ae458a94b1cd6bc168cba09d2e VSAN 1, ISID 246b00000000, Status active, no reservation
Example 40-9 Displays Detailed Information About the Specified iSCSI Session
switch# show iscsi session initiator 10.10.100.199 target VT1 detail Initiator 10.10.100.199 (oasis-qa) Initiator name iqn.1987-05.com.cisco.01.7e3183ae458a94b1cd6bc168cba09d2e VSAN 1, ISID 246b00000000, TSIH 384, Status active, no reservation Type Normal, ExpCmdSN 39, MaxCmdSN 54, Barrier 0 MaxBurstSize 0, MaxConn 0, DataPDUInOrder No DataSeqInOrder No, InitialR2T Yes, ImmediateData No Registered LUN 0, Mapped LUN 0 PDU: Command: 38, Response: 38 Local IP address: 10.10.100.200, Peer IP address: 10.10.100.199 MaxRecvDSLength 1024, our_MaxRecvDSLength 1392 CSG 3, NSG 3, min_pdu_size 48 (w/ data 48) AuthMethod none, HeaderDigest None (len 0), DataDigest None (len 0) FC target: Up, Reorder PDU: No, Marker send: No (int 0) Received MaxRecvDSLen key: No
Displaying iSCSI Initiators
Use the
show iscsi initiator
command to display information about all initiators connected to an iSCSI interface in the switch. The information can be filtered to display only the desired iSCSI initiator by specifying the initiator name. Detailed output of the iSCSI initiator can be obtained by specifying the
detail
option. The
iscsi-session
(and optionally
detail
) parameter displays only iSCSI session information. The
fcp-session
(and optionally
detail
) parameter displays only FCP session information. The output includes static and dynamic initiators. See Example 40-10 and Example 40-11.
Example 40-10 Displays Information About Connected iSCSI Initiators
switch# show iscsi initiator iSCSI Node name is iqn.1987-05.com.cisco:02.3021b0f2fda0.avanti12-w2k Initiator ip addr (s): 10.10.100.116 iSCSI alias name: AVANTI12-W2K Node WWN is 22:01:00:05:30:00:10:e1 (configured) Member of vsans: 1, 2, 10 Number of Virtual n_ports: 1 Virtual Port WWN is 22:04:00:05:30:00:10:e1 (configured) Interface iSCSI 4/1, Portal group tag: 0x180 VSAN ID 10, FCID 0x790000 iSCSI Node name is 10.10.100.199 iSCSI Initiator name: iqn.1987-05.com.cisco.01.7e3183ae458a94b1cd6bc168cba09d2e iSCSI alias name: oasis-qa Node WWN is 22:03:00:05:30:00:10:e1 (configured) Number of Virtual n_ports: 1 Virtual Port WWN is 22:00:00:05:30:00:10:e1 (configured) Interface iSCSI 4/1, Portal group tag: 0x180
Example 40-11 Displays Detailed Information About the iSCSI Initiator
switch# show iscsi initiator iqn.1987-05.com.cisco:02.3021b0f2fda0.avanti12-w2k detail iSCSI Node name is iqn.1987-05.com.cisco:02.3021b0f2fda0.avanti12-w2k Initiator ip addr (s): 10.10.100.116 iSCSI alias name: AVANTI12-W2K Node WWN is 22:01:00:05:30:00:10:e1 (configured) Member of vsans: 1, 2, 10 Number of Virtual n_ports: 1 Virtual Port WWN is 22:04:00:05:30:00:10:e1 (configured) Interface iSCSI 4/1, Portal group tag is 0x180 1 FC sessions, 1 iSCSI sessions iSCSI session details <-------------------iSCSI session details PDU: Command: 0, Response: 0 Local 10.10.100.200:3260, Remote 10.10.100.116:4190 Retransmission timeout: 310 ms Round trip time: Smoothed 160 ms, Variance: 38 Advertized window: Current: 61 KB, Maximum: 62 KB, Scale: 0 Peer receive window: Current: 63 KB, Maximum: 63 KB, Scale: 0 Congestion window: Current: 1 KB FCP Session details <-------------------FCP session details Target FCID: 0x6c01e8 (S_ID of this session: 0x6c0202) pWWN: 21:00:00:20:37:62:c0:0c, nWWN: 20:00:00:20:37:62:c0:0c 1 iSCSI sessions share this FC session RcvDataFieldSize 1392 our_RcvDataFieldSize 1392 MaxBurstSize 0, EMPD: FALSE Random Relative Offset: FALSE, Sequence-in-order: Yes PDU: Command: 0, Response: 0
Use the
show fcns database
(and optionally
detail
)
to display the Fibre Channel name server entry for the Fibre Channel N port created for iSCSI initiators in the SAN. See Example 40-12 and Example 40-13.
Example 40-12 Displays the FCNS Database Contents
switch# show fcns database -------------------------------------------------------------------------- FCID TYPE PWWN (VENDOR) FC4-TYPE:FEATURE -------------------------------------------------------------------------- 0x020101 N 22:04:00:05:30:00:35:e1 (Cisco) scsi-fcp:init isc..w <--iSCSI 0x020102 N 22:02:00:05:30:00:35:e1 (Cisco) scsi-fcp:init isc..w initiator 0x0205d4 NL 21:00:00:04:cf:da:fe:c6 (Seagate) scsi-fcp:target 0x0205d5 NL 21:00:00:04:cf:e6:e4:4b (Seagate) scsi-fcp:target Total number of entries = 10 -------------------------------------------------------------------------- FCID TYPE PWWN (VENDOR) FC4-TYPE:FEATURE -------------------------------------------------------------------------- 0xef0001 N 22:02:00:05:30:00:35:e1 (Cisco) scsi-fcp:init isc..w Total number of entries = 1 -------------------------------------------------------------------------- FCID TYPE PWWN (VENDOR) FC4-TYPE:FEATURE -------------------------------------------------------------------------- 0xed0001 N 22:02:00:05:30:00:35:e1 (Cisco) scsi-fcp:init isc..w Total number of entries = 1
Example 40-13 Displays the FCNS Database in Detail
switch# show fcns database detail port-wwn (vendor) :22:04:00:05:30:00:35:e1 (Cisco) node-wwn :22:03:00:05:30:00:35:e1 node-ip-addr :10.2.2.12 <--- iSCSI initiator's IPv4 address ipa :ff ff ff ff ff ff ff ff fc4-types:fc4_features:scsi-fcp:init iscsi-gw symbolic-node-name :iqn.1991-05.com.microsoft:oasis2-dell <--- iSCSI initiator's IQN fabric-port-wwn :22:01:00:05:30:00:35:de port-wwn (vendor) :22:02:00:05:30:00:35:e1 (Cisco) node-wwn :22:01:00:05:30:00:35:e1 ipa :ff ff ff ff ff ff ff ff fc4-types:fc4_features:scsi-fcp:init iscsi-gw symbolic-node-name :iqn.1987-05.com.cisco.01.14ac33ba567f986f174723b5f9f2377 fabric-port-wwn :22:01:00:05:30:00:35:de Total number of entries = 10 ====================================================================== port-wwn (vendor) :22:02:00:05:30:00:35:e1 (Cisco) node-wwn :22:01:00:05:30:00:35:e1 ipa :ff ff ff ff ff ff ff ff fc4-types:fc4_features:scsi-fcp:init iscsi-gw symbolic-node-name :iqn.1987-05.com.cisco.01.14ac33ba567f986f174723b5f9f2377 fabric-port-wwn :22:01:00:05:30:00:35:de Total number of entries = 1
Use the
show iscsi initiator configured
to display information about all the configured iSCSI initiators. Specifying the name shows information about the desired initiator. See Example 40-14.
Example 40-14 Displays Information About Configured Initiators
switch# show iscsi initiator configured iSCSI Node name is iqn.1987-05.com.cisco:02.3021b0f2fda0.avanti12-w2k Member of vsans: 1, 2, 10 Node WWN is 22:01:00:05:30:00:10:e1 Port WWN is 22:04:00:05:30:00:10:e1 Port WWN is 22:05:00:05:30:00:10:e1 Port WWN is 22:06:00:05:30:00:10:e1 Port WWN is 22:07:00:05:30:00:10:e1 Port WWN is 22:08:00:05:30:00:10:e1 iSCSI Node name is 10.10.100.199 Node WWN is 22:03:00:05:30:00:10:e1 Port WWN is 22:00:00:05:30:00:10:e1 Port WWN is 22:09:00:05:30:00:10:e1 Port WWN is 22:0a:00:05:30:00:10:e1 Port WWN is 22:0b:00:05:30:00:10:e1 User Name for Mutual CHAP: testuser
Displaying iSCSI Virtual Targets
Use the
show iscsi virtual-target
to display information about the Fibre Channel targets exported as iSCSI virtual targets to the iSCSI initiators. The output includes static as well as dynamic targets. See Example 40-15.
Example 40-15 Displays Exported Targets
switch# show iscsi virtual-target * Port WWN 21:00:00:20:37:62:c0:0c all initiator permit is enabled Port WWN 21:00:00:04:cf:4c:52:c1 all initiator permit is disabled target: iqn.1987-05.com.cisco:05.switch.04-01.2100002037a6be32 Port WWN 21:00:00:20:37:a6:be:32 , VSAN 1
Displaying iSCSI User Information
The
show user-account iscsi
command displays all configured iSCSI user names. See Example 40-16.
Example 40-16 Displays iSCSI User Names
switch# show user-account iscsi secret: dsfffsffsffasffsdffg secret:cshadhdhsadadjajdjas
Displaying iSLB VRRP Information
Use the
show islb vrrp summary vr
command to display VRRP load balancing information.
switch# show islb vrrp summary vr 30 -- Groups For Load Balance -- ------------------------------------------------------------------------------------------ VR Id VRRP Address Type Configured Status ------------------------------------------------------------------------------------------ -- Interfaces For Load Balance -- ------------------------------------------------------------------------------------------ VR Id VRRP IP Switch WWN Ifindex Load ------------------------------------------------------------------------------------------ 30 192.168.30.40 20:00:00:0d:ec:02:cb:00 GigabitEthernet3/1 2000 30 192.168.30.40 20:00:00:0d:ec:02:cb:00 GigabitEthernet3/2 2000 30 192.168.30.40 20:00:00:0d:ec:0c:6b:c0 GigabitEthernet4/1 2000 M 30 192.168.30.40 20:00:00:0d:ec:0c:6b:c0 GigabitEthernet4/2 1000
Displaying Pending iSLB Configuration Changes
You can display the pending configuration changes using the
show islb pending
command.
switch# show islb pending iscsi initiator idle-timeout 10 islb initiator ip-address 10.1.1.1 static pWWN 23:01:00:0c:85:90:3e:82 static pWWN 23:06:00:0c:85:90:3e:82 islb initiator ip-address 10.1.1.2 static nWWN 23:02:00:0c:85:90:3e:82
You can display the differences between the pending configuration and the current configuration using the
show islb pending-diff
command.
switch# show islb pending-diff +iscsi initiator idle-timeout 10 islb initiator ip-address 10.1.1.1 + static pWWN 23:06:00:0c:85:90:3e:82 +islb initiator ip-address 10.1.1.2 + static nWWN 23:02:00:0c:85:90:3e:82
Displaying iSLB CFS Status
You can display the iSLB CFS status using the
show islb session status
command.
iSLB Distribute is enabled
Displaying iSLB CFS Distribution Session Status
You can display the status of the iSLB CFS distribution session using the
show islb cfs-session status
command.
switch# show islb cfs-session status last action : fabric distribute enable last action result : success last action failure cause : success
Displaying iSLB CFS Merge Status
You can display the iSLB CFS merge status using the
show islb merge status
command.
switch# show islb merge status
Verifying iSNS Client Configuration
Use the
show isns profile
command to view configured iSNS profiles. Profile ABC has two portals registered with the iSNS server. Each portal corresponds to a particular interface. Profile XYZ has a specified iSNS server, but does not have any tagged interfaces configured (see Example 40-17 and Example 40-18).
Example 40-17 Displays Information for Configured iSNS Profiles
switch# show isns profile tagged interface GigabitEthernet2/3 tagged interface GigabitEthernet2/2 iSNS Server 10.10.100.204 iSNS Server 10.10.100.211
Example 40-18 Displays a Specified iSNS Profile
switch# show isns profile ABC tagged interface GigabitEthernet2/3 tagged interface GigabitEthernet2/2 iSNS Server 10.10.100.204
Use the
show isns profile counters
command to view all configured profiles with the iSNS PDU statistics for each tagged interface (see Example 40-19 and Example 40-20).
Example 40-19 Displays Configured Profiles with iSNS Statistics
switch# show isns profile counters tagged interface port-channel 1 Input 54 pdus (registration/deregistration pdus only) Reg pdus 37, Dereg pdus 17 Output 54 pdus (registration/deregistration pdus only) Reg pdus 37, Dereg pdus 17 iSNS Server 10.10.100.204 tagged interface port-channel 2 Input 30 pdus (registration/deregistration pdus only) Reg pdus 29, Dereg pdus 1 Output 30 pdus (registration/deregistration pdus only) Reg pdus 29, Dereg pdus 1
Example 40-20 Displays iSNS Statistics for a Specified Profile
switch# show isns profile ABC counters tagged interface port-channel 1 Input 54 pdus (registration/deregistration pdus only) Reg pdus 37, Dereg pdus 17 Output 54 pdus (registration/deregistration pdus only) Reg pdus 37, Dereg pdus 17 iSNS Server 10.10.100.204
Use the
show isns
command to view all objects registered on the iSNS server and specified in the given profile (see Example 40-21).
Example 40-21 Displays iSNS Queries
switch# show isns query ABC gigabitethernet 2/3 iSNS server: 10.10.100.204 Init: iqn.1991-05.com.w2k Alias: <MS SW iSCSI Initiator> Tgt : iqn.1987-05.com.cisco:05.172.22.94.22.02-03 Tgt : iqn.1987-05.com.cisco:05.172.22.94.22.02-03.210000203762fa34
Use the
show interface
command to view the iSNS profile to which an interface is tagged (see Example 40-22).
Example 40-22 Displays Tagged iSNS Interfaces
switch# show interface gigabitethernet 2/3
GigabitEthernet2/3 is up
Hardware is GigabitEthernet, address is 0005.3000.ae94 Internet address is 10.10.100.201/24 Auto-Negotiation is turned on 5 minutes input rate 112 bits/sec, 14 bytes/sec, 0 frames/sec 5 minutes output rate 0 bits/sec, 0 bytes/sec, 0 frames/sec 1935 packets input, 132567 bytes 4 multicast frames, 0 compressed 0 input errors, 0 frame, 0 overrun 0 fifo 1 packets output, 42 bytes, 0 underruns 0 output errors, 0 collisions, 0 fifo
Verifying the iSNS Server Configuration
Use the
show isns config
command to view the ESI interval and the summary information about the iSNS database contents (see Example 40-23).
Example 40-23 Displays the iSNS Server Configuration of ESI Interval and Database Contents
Server Name: switch1(Cisco Systems) Up since: Fri Jul 30 04:08:16 2004 Index: 1 Version: 1 TCP Port: 3205 fabric distribute (remote sync): ON Non Response Threshold: 5 Interval(seconds): 60 Number of ISCSI devices: 4 Number of Portal Groups: 0
Use the
show isns database
command to view detailed information about the contents of the iSNS database (see Example 40-24 through Example 40-27). This command displays the full iSNS database giving all the entities, nodes, and portals registered in the database. This command without options only displays explicitly registered objects. The asterisk next to the VSAN ID indicates that the iSCSI node is in the default zone for that VSAN.
Example 40-24 Displays Explicitly Registered Objects
switch# show isns database Index: 2 Last accessed: Fri Jul 30 04:08:46 2004 iSCSI Node Name: iqn.1991-05.comdp-2041 Node Type: Initiator(2) Node Index: 0x1 SCN Bitmap: OBJ_UPDATED|OBJ ADDED|OBJ REMOVED|TARGET&SELF Node Alias: <MS SW iSCSI Initiator> Portal IP Address: 192.168.100.2 TCP Port: 4179 Entity Index: 2 Portal Index: 1 ESI Interval: 0 ESI Port: 4180 SCN Port: 4180
Example 40-25 displays information about both virtual and registered iSCSI initiators/targets.
Example 40-25 Displays the Full Database with Both Registered and Configured Nodes and Portals
switch# show isns database full Entity Id: isns.entity.mds9000 Index: 1 Last accessed: Fri Jul 30 04:08:16 2004 iSCSI Node Name: iqn.com.cisco.disk1 Node Type: Target(1) Node Index: 0x80000001 iSCSI Node Name: iqn.isns-first-virtual-target Node Type: Target(1) Node Index: 0x80000002 iSCSI Node Name: iqn.com.cisco.disk2 Node Type: Target(1) Node Index: 0x80000003 Portal IP Address: 192.168.100.5 TCP Port: 3205 Entity Index: 1 Portal Index: 3 Portal IP Address: 192.168.100.6 TCP Port: 3205 Entity Index: 1 Portal Index: 5 Index: 2 Last accessed: Fri Jul 30 04:08:46 2004 iSCSI Node Name: iqn.1991-05.com.microsoft:dp-2041 Node Type: Initiator(2) Node Index: 0x1 SCN Bitmap: OBJ_UPDATED|OBJ ADDED|OBJ REMOVED|TARGET&SELF Node Alias: <MS SW iSCSI Initiator> Portal IP Address: 192.168.100.2 TCP Port: 4179 Entity Index: 2 Portal Index: 1 ESI Interval: 0 ESI Port: 4180 SCN Port: 4180
Example 40-26 displays the virtual targets entries on the current switch.
Note The local option is only available for virtual targets.
Example 40-26 Displays the Virtual Target Information in the Local Switch
switch# show isns database virtual-targets local Entity Id: isns.entity.mds9000 Index: 1 Last accessed: Fri Jul 30 04:08:16 2004 iSCSI Node Name: iqn.com.cisco.disk1 Node Type: Target(1) Node Index: 0x80000001 iSCSI Node Name: iqn.isns-first-virtual-target Node Type: Target(1) Node Index: 0x80000002 iSCSI Node Name: iqn.com.cisco.disk2 Node Type: Target(1) Node Index: 0x80000003 Portal IP Address: 192.168.100.5 TCP Port: 3205 Entity Index: 1 Portal Index: 3 Portal IP Address: 192.168.100.6 TCP Port: 3205 Entity Index: 1 Portal Index: 5
Example 40-27 provides the virtual target information for a specific remote switch. The remote switch is specified using the switch ID (the WWN of the switch).
Example 40-27 Displays Virtual Target for a Specified Switch
switch# show isns database virtual-targets switch 20:00:00:0d:ec:01:04:40 Entity Id: isns.entity.mds9000 Index: 1 Last accessed: Fri Jul 30 04:08:16 2004 iSCSI Node Name: iqn.com.cisco.disk1 Node Type: Target(1) Node Index: 0x80000001 iSCSI Node Name: iqn.isns-first-virtual-target Node Type: Target(1) Node Index: 0x80000002 iSCSI Node Name: iqn.com.cisco.disk2 Node Type: Target(1) Node Index: 0x80000003 Portal IP Address: 192.168.100.5 TCP Port: 3205 Entity Index: 1 Portal Index: 3 Portal IP Address: 192.168.100.6 TCP Port: 3205 Entity Index: 1 Portal Index: 5
Use the
show isns node
command to display attributes of nodes registered with the iSNS server (see Example 40-28 through Example 40-30). If you do not specify any options, the server displays the name and node type attribute in a compact format; one per line.
Example 40-28 Displays Explicitly Registered Objects
switch# show isns node all ------------------------------------------------------------------------------- ------------------------------------------------------------------------------- iqn.1987-05.com.cisco:05.switch1.02-03.22000020375a6c8 Target iqn.com.cisco.disk1 Target iqn.com.cisco.ipdisk Target iqn.isns-first-virtual-target Target
Example 40-29 Displays the Specified Node
switch# show isns node name iqn.com.cisco.disk1 iSCSI Node Name: iqn.com.cisco.disk1 Node Type: Target(1) Node Index: 0x80000001
Example 40-30 Displays the Attribute Details for All Nodes
switch# show isns node all detail iSCSI Node Name: iqn.1987-05.com.cisco:05.switch1.02-03.22000020375a6c8f Node Type: Target(1) Node Index: 0x3000003 Configured Switch WWN: 20:00:00:0d:ec:01:04:40 iSCSI Node Name: iqn.com.cisco.disk1 Node Type: Target(1) Node Index: 0x80000001 Configured Switch WWN: 20:00:00:0d:ec:01:04:40 iSCSI Node Name: iqn.com.cisco.ipdisk Node Type: Target(1) Node Index: 0x80000002 Configured Switch WWN: 20:00:00:0d:ec:01:04:40 iSCSI Node Name: iqn.isns-first-virtual-target Node Type: Target(1) Node Index: 0x80000003 Configured Switch WWN: 20:00:00:0d:ec:01:04:40 iSCSI Node Name: iqn.parna.121212 Node Type: Target(1) Node Index: 0x80000004 Configured Switch WWN: 20:00:00:0d:ec:01:04:40 iSCSI Node Name: iqn.parna.121213 Node Type: Target(1) Node Index: 0x80000005 Configured Switch WWN: 20:00:00:0d:ec:01:04:40
Use the
show isns portal
command to display the attributes of a portal along with its accessible nodes (see Example 40-31 through Example 40-35). You can specify portals by using the switch WWN-interface combination or the IP address-port number combination.
Example 40-31 Displays the Attribute Information for All Portals
switch# show isns portal all ------------------------------------------------------------------------------- IPAddress TCP Port Index SCN Port ESI port -------------------------------------------------------------------------------
Example 40-32 Displays Detailed Attribute Information for All Portals
switch# show isns portal all detail Portal IP Address: 192.168.100.5 TCP Port: 3205 Entity Index: 1 Portal Index: 3 Portal IP Address: 192.168.100.6 TCP Port: 3205 Entity Index: 1 Portal Index: 5
Example 40-33 Displays Virtual Portals
switch# show isns portal virtual ------------------------------------------------------------------------------- IPAddress TCP Port Index SCN Port ESI port -------------------------------------------------------------------------------
Example 40-34 Displays Virtual Portals for the Specified Switch
switch# show isns portal virtual switch 20:00:00:0d:ec:01:04:40 ------------------------------------------------------------------------------- IPAddress TCP Port Index SCN Port ESI port -------------------------------------------------------------------------------
Example 40-35 Displays Detailed Information for the Virtual Portals in the Specified Switch
switch# show isns portal virtual switch 20:00:00:0d:ec:01:04:40 detail Portal IP Address: 192.168.100.5 TCP Port: 3205 Entity Index: 1 Portal Index: 3 Switch WWN: 20:00:00:0d:ec:01:04:40 Interface: GigabitEthernet2/3 Portal IP Address: 192.168.100.6 TCP Port: 3205 Entity Index: 1 Portal Index: 5 Switch WWN: 20:00:00:0d:ec:01:04:40 Interface: GigabitEthernet2/5
Use the
show isns entity
command to display the attributes of an entity along with the list of portals and nodes in that entity (see Example 40-36 through Example 40-40). If you do not specify any option, this command displays the entity ID and number of nodes or portals associated with the entity in a compact format; one per line.
Example 40-36 Displays All Registered Entries
switch1# show isns entity ------------------------------------------------------------------------------- ------------------------------------------------------------------------------- dp-204 Tue Sep 7 23:15:42 2004
Example 40-37 Displays All Entities in the Database
switch# show isns entity all ------------------------------------------------------------------------------- ------------------------------------------------------------------------------- isns.entity.mds9000 Tue Sep 7 21:33:23 2004 dp-204 Tue Sep 7 23:15:42 2004
Example 40-38 Displays the Entity with the Specified ID
switch1# show isns entity id dp-204 Index: 2 Last accessed: Tue Sep 7 23:15:42 2004
Example 40-39 Displays Detailed Information for All Entities in the Database
switch1# show isns entity all detail Entity Id: isns.entity.mds9000 Index: 1 Last accessed: Tue Sep 7 21:33:23 2004 Index: 2 Last accessed: Tue Sep 7 23:16:34 2004
Example 40-40 Displays Virtual Entities
switch# show isns entity virtual Entity Id: isns.entity.mds9000 Index: 1 Last accessed: Thu Aug 5 00:58:50 2004 Index: 2 Last accessed: Thu Aug 5 01:00:23 2004
Use the
show iscsi global config
command to display information about import targets (see Example 40-41 and Example 40-42).
Example 40-41 Displays the Import Target Settings for the Specified Switch
switch# show isns iscsi global config switch 20:00:00:05:ec:01:04:00 iSCSI Global configuration: Switch: 20:00:00:05:ec:01:04:00 iSCSI Auto Import: Enabled
Example 40-42 Displays the Import Target Settings for All Switches
switch# show isns iscsi global config all iSCSI Global configuration: Switch: 20:00:44:0d:ec:01:02:40 iSCSI Auto Import: Enabled
Use the
show cfs peers
command to display CFS peers switch information about the iSNS application (see Example 40-43).
Example 40-43 Displays the CFS Peer Switch Information for the iSNS Application
switch# show cfs peers name isns -------------------------------------------------- -------------------------------------------------- 20:00:00:00:ec:01:00:40 10.10.100.11 [Local] Total number of entries = 1
Verifying Automatic iSNS Cloud Discovery Configuration
To verify the automatic iSNS cloud discovery configuration, use the
show cloud discovery config
command.
switch# show cloud discovery config
Verifying Cloud Discovery Status
Use the
show cloud discovery status
command to verify the status of the cloud discovery operation.
switch# show cloud discovery status Discovery status: Succeeded
Verifying Cloud Discovery Membership
Use the
show cloud membership all
command to verify the cloud membership for the switch.
switch# show cloud membership all GigabitEthernet1/5[20:00:00:0d:ec:02:c6:c0] IP Addr 10.10.10.5 GigabitEthernet1/6[20:00:00:0d:ec:02:c6:c0] IP Addr 10.10.10.6
Use the
show cloud membership unresolved
command to verify the unresolved membership on the switch.
switch# show cloud membership unresolved
Displaying Cloud Discovery Statistics
Use the
show cloud discovery statistics
command to display the statistics for the cloud discovery operation.
switch# show cloud discovery statistics Number of Auto Discovery = 1 Number of Manual Discovery = 0 Number of cloud discovery (ping) messages sent = 1 Number of cloud discovery (ping) success = 1
Configuration Examples for iSCSI
This section provides three examples of iSCSI virtual target configurations.
Example 1
This example assigns the whole Fibre Channel target as an iSCSI virtual target. All LUNs that are part of the Fibre Channel target are available as part of the iSCSI target (see Figure 40-17).
Figure 40-17 Assigning iSCSI Node Names
iscsi virtual-target name iqn.1987-02.com.cisco.target-1 pWWN 28:00:01:02:03:04:05:06
Example 2
This example maps a subset of LUNs of a Fibre Channel target to three iSCSI virtual targets. Each iSCSI target only has one LUN (see Figure 40-18).
Figure 40-18 Mapping LUNs to an iSCSI Node Name
iscsi virtual-target name iqn.1987-02.com.cisco.target-1 pWWN 28:00:01:02:03:04:05:06 fc-lun 0 iscsi-lun 0 iscsi virtual-target name iqn.1987-02.com.cisco.target-2 pWWN 28:00:01:02:03:04:05:06 fc-lun 1 iscsi-lun 0 iscsi virtual-target name iqn.1987-02.com.cisco.target-3 pWWN 28:00:01:02:03:04:05:06 fc-lun 2 iscsi-lun 0
Example 3
This example maps three subsets of Fibre Channel LUN targets to three iSCSI virtual targets. Two iSCSI targets have one LUN and the third iSCSI target has two LUNs (see Figure 40-19).
Figure 40-19 Mapping LUNs to Multiple iSCSI Node Names
iscsi virtual-target name iqn.1987-02.com.cisco.target-1 pWWN 28:00:01:02:03:04:05:06 fc-lun 0 iscsi-lun 0 iscsi virtual-target name iqn.1987-02.com.cisco.target-2 pWWN 28:00:01:02:03:04:05:06 fc-lun 1 iscsi-lun 0 iscsi virtual-target name iqn.1987-02.com.cisco.target-3 pWWN 28:00:01:02:03:04:05:06 fc-lun 2 iscsi-lun 0 pWWN 28:00:01:02:03:04:05:06 fc-lun 3 iscsi-lun 1
Example of VSAN Membership for iSCSI Devices
Figure 40-20 provides an example of VSAN membership for iSCSI devices:
-
iSCSI interface 1/1 is a member of VSAN Y.
-
iSCSI initiator host A has explicit VSAN membership to VSAN X.
-
Three iSCSI initiators (host A, host B, and host C) C connect to iSCSI interface 1/1.
Figure 40-20 VSAN Membership for iSCSI Interfaces
Host A’s virtual Fibre Channel N port will be added to VSAN X because of explicit membership for the initiator. The virtual host-B and host-C N ports do not have any explicit membership configuration so they will inherit the iSCSI interface VSAN membership and be part of VSAN Y.
Example 40-44 and Example 40-45 are based on the following configurations:
-
GigabitEthernet2/1.441 is the VRRP master interface for Switch1.
-
GigabitEthernet2/2.441 is the VRRP backup interface for Switch1.
-
GigabitEthernet1/1.441 is the VRRP backup interface for Switch2.
-
GigabitEthernet1/2.441 is the VRRP backup interface for Switch2.
Example 40-44 Load Distribution with the Default Metric
The follow example output shows the initial load distribution for three initiators with the default load metric value:
switch# show islb vrrp summary -------------------------------------------------------------------------------- VR Id VRRP IP Switch WWN Ifindex Load -------------------------------------------------------------------------------- M 1 10.10.122.115 20:00:00:0b:5f:3c:01:80 GigabitEthernet2/1.441 0 1 10.10.122.115 20:00:00:0b:5f:3c:01:80 GigabitEthernet2/2.441 1000 1 10.10.122.115 20:00:00:0c:ce:5c:5b:c0 GigabitEthernet1/1.441 1000 1 10.10.122.115 20:00:00:0c:ce:5c:5b:c0 GigabitEthernet1/2.441 1000 -- Initiator To Interface Assignment -- -------------------------------------------------------------------------------- Initiator VR Id VRRP IP Switch WWN Ifindex -------------------------------------------------------------------------------- iqn.cisco.test-linux.init0 1 10.10.122.115 20:00:00:0b:5f:3c:01:80 GigabitEthernet2/2.441 iqn.cisco.test-linux.init1 1 10.10.122.115 20:00:00:0c:ce:5c:5b:c0 GigabitEthernet1/1.441 iqn.cisco.test-linux.init 1 10.10.122.115 20:00:00:0c:ce:5c:5b:c0 GigabitEthernet1/2.441
The following example output shows load distribution for four initiators. The interface load metric value for the master interface changed from 0 to 1000.
switch# show islb vrrp summary -------------------------------------------------------------------------------- VVR Id VRRP IP Switch WWN Ifindex Load -------------------------------------------------------------------------------- M 1 10.10.122.115 20:00:00:0b:5f:3c:01:80 GigabitEthernet2/1.441 1000 1 10.10.122.115 20:00:00:0b:5f:3c:01:80 GigabitEthernet2/2.441 1000 1 10.10.122.115 20:00:00:0c:ce:5c:5b:c0 GigabitEthernet1/1.441 1000 1 10.10.122.115 20:00:00:0c:ce:5c:5b:c0 GigabitEthernet1/2.441 1000 -- Initiator To Interface Assignment -- -------------------------------------------------------------------------------- Initiator VR Id VRRP IP Switch WWN Ifindex -------------------------------------------------------------------------------- iqn.cisco.test-linux.init0 1 10.10.122.115 20:00:00:0b:5f:3c:01:80 GigabitEthernet2/2.441 iqn.cisco.test-linux.init1 1 10.10.122.115 20:00:00:0c:ce:5c:5b:c0 GigabitEthernet1/1.441 iqn.cisco.test-linux.init2 1 10.10.122.115 20:00:00:0c:ce:5c:5b:c0 GigabitEthernet1/2.441 iqn.cisco.test-linux.init3 1 10.10.122.115 20:00:00:0b:5f:3c:01:80 GigabitEthernet2/1.441
The following example output shows load distribution for nine initiators. The interface load metric values for the backup interfaces have changed.
switch# show islb vrrp summary -------------------------------------------------------------------------------- VVR Id VRRP IP Switch WWN Ifindex Load -------------------------------------------------------------------------------- M 1 10.10.122.115 20:00:00:0b:5f:3c:01:80 GigabitEthernet2/1.441 1000 1 10.10.122.115 20:00:00:0b:5f:3c:01:80 GigabitEthernet2/2.441 3000 1 10.10.122.115 20:00:00:0c:ce:5c:5b:c0 GigabitEthernet1/1.441 3000 1 10.10.122.115 20:00:00:0c:ce:5c:5b:c0 GigabitEthernet1/2.441 2000 -- Initiator To Interface Assignment -- -------------------------------------------------------------------------------- Initiator VR Id VRRP IP Switch WWN Ifindex -------------------------------------------------------------------------------- iqn.cisco.test-linux.init0 1 10.10.122.115 20:00:00:0b:5f:3c:01:80 GigabitEthernet2/2.441 iqn.cisco.test-linux.init1 1 10.10.122.115 20:00:00:0c:ce:5c:5b:c0 GigabitEthernet1/1.441 iqn.cisco.test-linux.init2 1 10.10.122.115 20:00:00:0c:ce:5c:5b:c0 GigabitEthernet1/2.441 iqn.cisco.test-linux.init3 1 10.10.122.115 20:00:00:0b:5f:3c:01:80 GigabitEthernet2/1.441 iqn.cisco.test-linux.init4 1 10.10.122.115 20:00:00:0b:5f:3c:01:80 GigabitEthernet2/2.441 iqn.cisco.test-linux.init5 1 10.10.122.115 20:00:00:0c:ce:5c:5b:c0 GigabitEthernet1/1.441 iqn.cisco.test-linux.init6 1 10.10.122.115 20:00:00:0c:ce:5c:5b:c0 GigabitEthernet1/2.441 iqn.cisco.test-linux.init7 1 10.10.122.115 20:00:00:0b:5f:3c:01:80 GigabitEthernet2/2.441 iqn.cisco.test-linux.init8 1 10.10.122.115 20:00:00:0c:ce:5c:5b:c0 GigabitEthernet1/1.441
Example 40-45 Load Distribution with the Metric Set to 3000 on One Initiator
The following example output shows the initial load distribution for three initiators with one initiator having load metric of 3000 and the remaining initiator with the default metric value:
switch# show islb vrrp summary -------------------------------------------------------------------------------- VVR Id VRRP IP Switch WWN Ifindex Load -------------------------------------------------------------------------------- M 1 10.10.122.115 20:00:00:0b:5f:3c:01:80 GigabitEthernet2/1.441 0 1 10.10.122.115 20:00:00:0b:5f:3c:01:80 GigabitEthernet2/2.441 1000 1 10.10.122.115 20:00:00:0c:ce:5c:5b:c0 GigabitEthernet1/1.441 3000 1 10.10.122.115 20:00:00:0c:ce:5c:5b:c0 GigabitEthernet1/2.441 1000 -- Initiator To Interface Assignment -- -------------------------------------------------------------------------------- Initiator VR Id VRRP IP Switch WWN Ifindex -------------------------------------------------------------------------------- iqn.cisco.test-linux.init0 1 10.10.122.115 20:00:00:0c:ce:5c:5b:c0 GigabitEthernet1/1.441 iqn.cisco.test-linux.init1 1 10.10.122.115 20:00:00:0b:5f:3c:01:80 GigabitEthernet2/2.441 iqn.cisco.test-linux.init2 1 10.10.122.115 20:00:00:0c:ce:5c:5b:c0 GigabitEthernet1/2.441
The follow example output shows load distribution for four initiators. The interface load metric value for the master interface changed from 0 to 1000.
switch# show islb vrrp summary -------------------------------------------------------------------------------- VVR Id VRRP IP Switch WWN Ifindex Load -------------------------------------------------------------------------------- M 1 10.10.122.115 20:00:00:0b:5f:3c:01:80 GigabitEthernet2/1.441 1000 1 10.10.122.115 20:00:00:0b:5f:3c:01:80 GigabitEthernet2/2.441 3000 1 10.10.122.115 20:00:00:0c:ce:5c:5b:c0 GigabitEthernet1/1.441 1000 1 10.10.122.115 20:00:00:0c:ce:5c:5b:c0 GigabitEthernet1/2.441 1000 -- Initiator To Interface Assignment -- -------------------------------------------------------------------------------- Initiator VR Id VRRP IP Switch WWN Ifindex -------------------------------------------------------------------------------- iqn.cisco.test-linux.init0 1 10.10.122.115 20:00:00:0b:5f:3c:01:80 GigabitEthernet2/2.441 iqn.cisco.test-linux.init1 1 10.10.122.115 20:00:00:0c:ce:5c:5b:c0 GigabitEthernet1/2.441 iqn.cisco.test-linux.init2 1 10.10.122.115 20:00:00:0c:ce:5c:5b:c0 GigabitEthernet1/1.441 iqn.cisco.test-linux.init3 1 10.10.122.115 20:00:00:0b:5f:3c:01:80 GigabitEthernet2/1.441
The following example output shows load distribution for nine initiators. The interface load metric values for the backup interfaces have changed.
switch# show islb vrrp summary -------------------------------------------------------------------------------- VVR Id VRRP IP Switch WWN Ifindex Load -------------------------------------------------------------------------------- M 1 10.10.122.115 20:00:00:0b:5f:3c:01:80 GigabitEthernet2/1.441 2000 1 10.10.122.115 20:00:00:0b:5f:3c:01:80 GigabitEthernet2/2.441 3000 1 10.10.122.115 20:00:00:0c:ce:5c:5b:c0 GigabitEthernet1/1.441 3000 1 10.10.122.115 20:00:00:0c:ce:5c:5b:c0 GigabitEthernet1/2.441 3000 -- Initiator To Interface Assignment -- -------------------------------------------------------------------------------- Initiator VR Id VRRP IP Switch WWN Ifindex -------------------------------------------------------------------------------- iqn.cisco.test-linux.init0 1 10.10.122.115 20:00:00:0b:5f:3c:01:80 GigabitEthernet2/2.441 iqn.cisco.test-linux.init1 1 10.10.122.115 20:00:00:0c:ce:5c:5b:c0 GigabitEthernet1/1.441 iqn.cisco.test-linux.init2 1 10.10.122.115 20:00:00:0c:ce:5c:5b:c0 GigabitEthernet1/2.441 iqn.cisco.test-linux.init3 1 10.10.122.115 20:00:00:0b:5f:3c:01:80 GigabitEthernet2/1.441 iqn.cisco.test-linux.init4 1 10.10.122.115 20:00:00:0c:ce:5c:5b:c0 GigabitEthernet1/1.441 iqn.cisco.test-linux.init5 1 10.10.122.115 20:00:00:0c:ce:5c:5b:c0 GigabitEthernet1/2.441 iqn.cisco.test-linux.init6 1 10.10.122.115 20:00:00:0c:ce:5c:5b:c0 GigabitEthernet1/1.441 iqn.cisco.test-linux.init7 1 10.10.122.115 20:00:00:0c:ce:5c:5b:c0 GigabitEthernet1/2.441 iqn.cisco.test-linux.init8 1 10.10.122.115 20:00:00:0b:5f:3c:01:80 GigabitEthernet2/1.441
Example of an iSNS Server
The iSNS server provides uniform access control across Fibre Channel and iSCSI devices by utilizing both Fibre Channel zoning information and iSCSI access control information and configuration. An iSCSI initiator acting as an iSNS client only discovers devices it is allowed to access based on both sets of access control information. Figure 40-21 provides an example of this scenario.
Figure 40-21 Using iSNS Servers in the Cisco MDS Environment
In Figure 40-21, iqn.host1 and iqn.host2 are iSCSI initiators. P1 and P2 are Fibre Channel targets. The two initiators are in different zones: Zone 1 consists of iqn.host1 and target P1, and Zone 2 consists of iqn.host2 and target P2. iSNS server functionality is enabled on both switches, SW-1 and SW-2. The registration process proceeds as follows:
1. Initiator iqn.host1 registers with SW-1, port Gigabitethernet2/1.
2. Initiator iqn.host2 registers with SW-2, port Gigabitethernet3/1.
3. Initiator iqn.host1 issues an iSNS query to SW-1 to determine all accessible targets.
4. The iSNS server in turn queries the Fibre Channel name server (FCNS) to obtain a list of devices that are accessible (that is, in the same zone) by the query originator. This query yields only P1.
5. The iSNS server then queries its own database to convert the Fibre Channel devices to the corresponding iSCSI targets. This is based on the iSCSI configuration, such as virtual-target and its access control setting or whether the dynamic Fibre Channel target import feature is enabled or disabled.
6. The iSNS server sends a response back to the query initiator. This response contains a list all iSCSI portals known to the iSNS server. This means iqn.host1 can choose to log in to target P1 through either SW-1 (at Gigabitethernet 2/1) or SW-2 (at Gigabitethernet 3/1).
7. If the initiator chooses to log in to SW-1 and later that port becomes inaccessible (for example, Gigabitethernet 2/1 goes down), the initiator has the choice to move to connect to target P1 through port Gigabitethernet 3/1 on SW-2 instead.
8. If the target either goes down or is removed from the zone, the iSNS server sends out an iSNS State Change Notification (SCN) message to the initiator so that the initiator can remove the session.
iSCSI Transparent Mode Initiator Example
This examples assumes the following configuration (see Figure 40-22):
-
No LUN mapping or LUN masking or any other access control for hosts on the target device
-
No iSCSI login authentication (that is, login authentication set to none)
-
The topology is as follows:
– iSCSI interface 7/1 is configured to identify initiators by IP address.
– iSCSI interface 7/5 is configured to identify initiators by node name.
– The iSCSI initiator host 1 with IPv4 address 10.11.1.10 and name iqn.1987-05.com.cisco:01.255891611111 connects to IPS port 7/1 is identified using IPv4 address (host 1 = 10.11.1.10).
– The iSCSI initiator host 2 with IPv4 address 10.15.1.10 and node name iqn.1987-05.com.cisco:01.25589167f74c connects to IPS port 7/5.
Figure 40-22 iSCSI Transparent Mode Initiator
To configure scenario 1 (see Figure 40-22), follow these steps:
Step 1 Configure null authentication for all iSCSI hosts in Cisco MDS switches.
switch(config)# iscsi authentication none
Step 2 Configure iSCSI to dynamically import all Fibre Channel targets into the iSCSI SAN using auto-generated iSCSI target names.
switch(config)# iscsi import target fc
Step 3 Configure the Gigabit Ethernet interface in slot 7 port 1 with an IPv4 address and enable the interface.
switch(config)# interface gigabitethernet 7/1 switch(config-if)# ip address 10.11.1.1 255.255.255.0 switch(config-if)# no shutdown
Note Host 2 is connected to this port.
Step 4 Configure the iSCSI interface in slot 7 port 1 to identify all dynamic iSCSI initiators by their IP address, and enable the interface.
switch(config)# interface iscsi 7/1 switch(config-if)# switchport initiator id ip-address switch(config-if)# no shut
Step 5 Configure the Gigabit Ethernet interface in slot 7 port 5 with the IPv4 address and enable the interface.
switch(config)# interface gigabitethernet 7/5 switch(config-if)# ip address 10.15.1.1 255.255.255.0 switch(config-if)# no shutdown
Step 6 Configure the iSCSI interface in slot 7 port 5 to identify all dynamic iSCSI initiators by node name and enable the interface.
switch(config)# interface iscsi 7/5 switch(config-if)# switchport initiator id name switch(config-if)# no shutdown
Note Host 1 is connected to this port.
Step 7 Verify the available Fibre Channel targets (see Figure 40-22).
switch# show fcns database -------------------------------------------------------------------------- FCID TYPE PWWN (VENDOR) FC4-TYPE:FEATURE -------------------------------------------------------------------------- 0x6d0001 NL 21:00:00:20:37:6f:fd:97 (Seagate) scsi-fcp:target 0x6d0101 NL 21:00:00:20:37:6f:fe:54 (Seagate) scsi-fcp:target 0x6d0201 NL 21:00:00:20:37:a6:a6:5d (Seagate) scsi-fcp:target Total number of entries = 3
Step 8 Create a zone named
iscsi-zone-1
with host 1 and one Fibre Channel target in it.
Note Use the IP address of the host in zone membership configuration because the iSCSI interface is configured to identify all hosts based on IP address.
switch(config)# zone name iscsi-zone-1 vsan 1 switch(config-zone)# member pwwn 21:00:00:20:37:6f:fd:97 switch(config-zone)# member ip-address 10.11.1.10
Step 9 Create a zone named
iscsi-zone-2
with host 2 and two Fibre Channel targets in it.
Note Use the symbolic node name of the iSCSI host in zone membership configuration because the iSCSI interface is configured to identify all hosts based on node name.
switch(config)# zone name iscsi-zone-2 vsan 1 switch(config-zone)# member pwwn 21:00:00:20:37:6f:fe:54 switch(config-zone)# member pwwn 21:00:00:20:37:a6:a6:5d switch(config-zone)# member symbolic-nodename iqn.1987-05.com.cisco:01.25589167f74c
Step 10 Create a zone set and add the two zones as members.
switch(config)# zoneset name zoneset-iscsi vsan 1 switch(config-zoneset)# member iscsi-zone-1 switch(config-zoneset)# member iscsi-zone-2
Step 11 Activate the zone set.
switch(config)# zoneset activate name zoneset-iscsi vsan 1
Step 12 Display the active zone set.
Note The iSCSI hosts are not connected so they do not have an FC ID yet.
switch# show zoneset active zoneset name zoneset-iscsi vsan 1 zone name iscsi-zone-1 vsan 1 * fcid 0x6d0001 [pwwn 21:00:00:20:37:6f:fd:97] <-----------Target symbolic-nodename 10.11.1.10 <--------------------------------- iSCSI host (host 1, not online) zone name iscsi-zone-2 vsan 1 * fcid 0x6d0101 [pwwn 21:00:00:20:37:6f:fe:54] <------------Target * fcid 0x6d0201 [pwwn 21:00:00:20:37:a6:a6:5d] <------------Target symbolic-nodename iqn.1987-05.com.cisco:01.25589167f74c <-iSCSI host (host 2, not online)
Step 13 Bring up the iSCSI hosts (host 1 and host 2).
Step 14 Show all the iSCSI sessions (use the
detail
option for detailed information).
switch# show iscsi session Initiator iqn.1987-05.com.cisco:01.25589167f74c <-----Host 2 Initiator ip addr (s): 10.15.1.11 Target iqn.1987-05.com.cisco:05.172.22.92.166.07-05.21000020376ffe54
Note The last part of the auto-created target name is the Fibre Channel target's pWWN.
VSAN 1, ISID 00023d000001, Status active, no reservation Target iqn.1987-05.com.cisco:05.172.22.92.166.07-05.2100002037a6a65d VSAN 1, ISID 00023d000001, Status active, no reservation Initiator 10.11.1.10 <-----------------------------------Host 1 Initiator name iqn.1987-05.com.cisco:01.e41695d16b1a Target iqn.1987-05.com.cisco:05.172.22.92.166.07-01.21000020376ffd97 VSAN 1, ISID 00023d000001, Status active, no reservation
Step 15 Verify the details of the two iSCSI initiators.
switch#
show iscsi initiator
iSCSI Node name is iqn.1987-05.com.cisco:01.25589167f74c
<---------
Initiator ip addr (s): 10.15.1.11
iSCSI alias name: oasis11.cisco.com
Node WWN is
20:02:00:0b:fd:44:68:c2
(dynamic)
Member of vsans: 1
Number of Virtual n_ports: 1
Virtual Port WWN is
20:03:00:0b:fd:44:68:c2
(dynamic)
Interface
iSCSI 7/5
, Portal group tag: 0x304
VSAN ID 1, FCID 0x6d0300
|
Host 2: Initiator ID based on node name because the initiator is entering iSCSI interface 7/5
|
iSCSI Node name is 10.11.1.10
<------------------------
iSCSI Initiator name: iqn.1987 - 05.com.cisco:01.e41695d16b1a
iSCSI alias name: oasis10.cisco.com
Node WWN is
20:04:00:0b:fd:44:68:c2
(dynamic)
Member of vsans: 1
Number of Virtual n_ports: 1
Virtual Port WWN is
20:05:00:0b:fd:44:68:c2
(dynamic)
Interface
iSCSI 7/1
, Portal group tag: 0x300
VSAN ID 1, FCID 0x6d0301
|
Host 1: Initiator ID based on IPv4 address because the initiator is entering iSCSI interface 7/1
|
Step 16 View the active zone set. The iSCSI initiators' FC IDs are resolved.
switch#
show zoneset active
zoneset name zoneset-iscsi vsan 1
zone name iscsi-zone-1 vsan 1
* fcid 0x6d0001 [pwwn 21:00:00:20:37:6f:fd:97]
* fcid
0x6d0301
[symbolic-nodename 10.11.1.10]
<-------------
|
FC ID resolved for
host 1
|
zone name iscsi-zone-2 vsan 1
* fcid 0x6d0101 [pwwn 21:00:00:20:37:6f:fe:54]
* fcid 0x6d0201 [pwwn 21:00:00:20:37:a6:a6:5d]
* fcid
0x6d0300
[symbolic-nodename iqn.1987-05.com.cisco:01.25589167f74c]
<-------------------------
|
FC ID for host 2
|
Step 17 The Fibre Channel name server shows the virtual N ports created for the iSCSI hosts.
switch# show fcns database -------------------------------------------------------------------------- FCID TYPE PWWN (VENDOR) FC4-TYPE:FEATURE -------------------------------------------------------------------------- 0x6d0001 NL 21:00:00:20:37:6f:fd:97 (Seagate) scsi-fcp:target 0x6d0101 NL 21:00:00:20:37:6f:fe:54 (Seagate) scsi-fcp:target 0x6d0201 NL 21:00:00:20:37:a6:a6:5d (Seagate) scsi-fcp:target 0x6d0300 N 20:03:00:0b:fd:44:68:c2 (Cisco) scsi-fcp:init isc..w 0x6d0301 N 20:05:00:0b:fd:44:68:c2 (Cisco) scsi-fcp:init isc..w
Step 18 Verify the detailed output of the iSCSI initiator nodes in the Fibre Channel name server.
switch#
show fcns database fcid 0x6d0300 detail vsan 1
------------------------
VSAN:1 FCID:0x6d0300
------------------------
port-wwn (vendor) :20:03:00:0b:fd:44:68:c2 (Cisco)
node-wwn :20:02:00:0b:fd:44:68:c2
class :2,3
node-ip-addr :10.15.1.11
<----------------------
ipa :ff ff ff ff ff ff ff ff
fc4-types:fc4_features:scsi-fcp:init iscsi-gw
<------
symbolic-port-name :
|
IPv4 address of the iSCSI host
iSCSI gateway node
|
symbolic-node-name :iqn.1987-05.com.cisco:01.25589167f74c
<--------------------
port-type :N
port-ip-addr :0.0.0.0
fabric-port-wwn :21:91:00:0b:fd:44:68:c0
hard-addr :0x000000
Total number of entries = 1
|
iSCSI initiator ID is based on the registered node name
|
switch#
show fcns database fcid 0x6d0301 detail vsan 1
------------------------
VSAN:1 FCID:0x6d0301
------------------------
port-wwn (vendor) :20:05:00:0b:fd:44:68:c2 (Cisco)
node-wwn :20:04:00:0b:fd:44:68:c2
class :2,3
node-ip-addr :10.11.1.10
ipa :ff ff ff ff ff ff ff ff
fc4-types:fc4_features:scsi-fcp:init iscsi-gw
<------
symbolic-port-name :
|
iSCSI gateway node
|
symbolic-node-name :10.11.1.10
<---------------------
port-type :N
port-ip-addr :0.0.0.0
fabric-port-wwn :21:81:00:0b:fd:44:68:c0
hard-addr :0x000000
|
iSCSI initiator ID is based on the IPv4 address registered in symbolic-node-name field
|
To configure this example(see Figure 40-22), follow these steps:
Step 1 Configure null authentication for all iSCSI hosts in Cisco MDS switches.
a. In Cisco DCNM-SAN, choose
End Devices
>
iSCSI
in the Physical Attributes pane.
b. Select
none
from the AuthMethod drop-down menu in the Information pane.
c. Click the
Apply Changes
icon.
Step 2 Configure iSCSI to dynamically import all Fibre Channel targets into the iSCSI SAN using auto-generated iSCSI target names.
a. In Device Manager, click
IP
>
iSCSI
.
b. Click the
Targets
tab.
c. Check the
Dynamically Import FC Targets
check box.
d. Click
Apply
.
Step 3 Configure the Gigabit Ethernet interface in slot 7 port 1 with an IPv4 address and enable the interface.
a. In Cisco DCNM-SAN, choose
Switches
>
Interfaces
>
Gigabit Ethernet
in the Physical Attributes pane.
b. Select the
IP Address
tab in the Information pane and click
Create Row
.
c. Set the IP address and subnet mask for the Gigabit Ethernet interface in slot 7 port 1.
d. Click
Create
.
e. Select the General tab and select
up
from the Admin drop-down menu for the Gigabit Ethernet interface in slot 7 port 1.
f. Click the Apply Changes icon.
Note Host 2 is connected to this port.
Step 4 Configure the iSCSI interface in slot 7 port 1 to identify all dynamic iSCSI initiators by their IP address, and enable the interface.
a. In Cisco DCNM-SAN, choose
Switches
>
Interfaces
>
FC Logical
in the Physical Attributes pane.
b. Click the
iSCSI
tab in the Information pane.
c. Select
ipaddress
from the Initiator ID Mode drop-down menu and click the
Apply Changes
icon.
d. In Device Manager, choose
Interfaces
>
Ethernet and iSCSI
.
e. Click the
iSCSI
tab.
f. Select
up
from the Admin drop-down menu for the iSCSI interface in slot 7 port 1.
g. Click
Apply
.
Step 5 Configure the Gigabit Ethernet interface in slot 7 port 5 with an IPv4 address and enable the interface.
a. In Cisco DCNM-SAN, choose
Switches
>
Interfaces
>
Gigabit Ethernet
in the Physical Attributes pane.
b. Click the
IP Address
tab in the Information pane and click
Create Row
.
c. Set the IP address and subnet mask for the Gigabit Ethernet interface in slot 7 port 5.
d. Click
Create
.
e. Select the General tab and select
up
from the Admin drop-down menu for the Gigabit Ethernet interface in slot 7 port 5.
f. Click the
Apply Changes
icon.
Step 6 Configure the iSCSI interface in slot 7 port 5 to identify all dynamic iSCSI initiators by node name and enable the interface.
a. In Cisco DCNM-SAN, choose
Switches
>
Interfaces
>
FC Logical
in the Physical Attributes pane.
b. Click the
iSCSI
tab in the Information pane.
c. Select
name
from the Initiator ID Mode drop-down menu and click the
Apply Changes
icon.
d. In Device Manager, choose
Interfaces
>
Ethernet and iSCSI
.
e. Click the
iSCSI
tab.
f. Select
up
from the Admin drop-down menu for the iSCSI interface in slot 7 port 5.
g. Click
Apply
.
Note Host 1 is connected to this port.
Step 7 Verify the available Fibre Channel targets.
a. In Device Manager, Choose
FC
>
Name Server
.
b. Click the
General
tab.
Step 8 Create a zone named
iscsi-zone-1
with host 1 and one Fibre Channel target in it.
Note Use the IP address of the host in zone membership configuration because the iSCSI interface is configured to identify all hosts based on IP address.
a. In Cisco DCNM-SAN, choose
Zones
>
Edit Local Full Zone Database
.
b. Select VSAN 1 from the VSAN drop-down menu in the Edit Local Full Zone Database dialog box.
c. Select the
Zones
folder in the left navigation pane and click
Insert
.
d. Set the Zone Name field to
iscsi-zone-1
and click
OK
.
e. Select the iscsi-zone-1 folder in the left navigation pane and click
Insert
.
f. Set the ZoneBy radio button to
WWN
.
g. Set the Port WWN to the pWWN for the Fibre Channel target (that is, 21:00:00:20:37:6f:fd:97) and click
Add
.
h. Set the ZoneBy radio button to
iSCSI IP Address/Subnet
.
i. Set the IP Address/Mask field to the IP Address for Host 1 iSCSI initiator (10.11.1.10) and click
Add
.
Step 9 Create a zone named
iscsi-zone-2
with host 2 and two Fibre Channel targets in it.
Note Use the symbolic node name of the iSCSI host in zone membership configuration because the iSCSI interface is configured to identify all hosts based on node name.
a. In Cisco DCNM-SAN, choose
Zones
>
Edit Local Full Zone Database
from the main menu.
b. Select VSAN 2 from the VSAN drop-down menu in the Edit Local Full Zone Database dialog box.
c. Select the
Zones
folder in the left navigation pane and click
Insert
.
d. Set the Zone Name field to
iscsi-zone-2
and click
OK
.
e. Select the
iscsi-zone-2
folder in the left navigation pane and click
Insert
.
f. Set the ZoneBy radio button to
WWN
.
g. Set the Port WWN to the pWWN for one of the Fibre Channel targets (for example, 21:00:00:20:37:6f:fe:5). and click
Add
.
h. Set the Port WWN to the pWWN for another of the Fibre Channel targets (for example, 21:00:00:20:37:a6:a6:5d). and click
Add
.
i. Set the ZoneBy radio button to
iSCSI name
.
j. Set the Port Name field to the symbolic name for host 2 (iqn.1987-05.com.cisco:01.25589167f74c) and click
Add
.
Step 10 Create a zone set, add the two zones as members, and activate the zone set.
Note iSCSI interface is configured to identify all hosts based on node name.
a. In Cisco DCNM-SAN, choose
Zones
>
Edit Local Full Zone Database
.
b. Select VSAN 1 from the VSAN drop-down menu in the Edit Local Full Zone Database dialog box.
c. Select the
Zoneset
folder in the left navigation pane and click
Insert
.
d. Set the Zoneset Name to
zonset-iscsi
and click
OK
.
e. Click on the
zoneset-iscsi
folder and click
Insert
.
f. Set the Zone Name field to
iscsi-zone-1
and click
OK
.
g. Set the Zone Name field to
iscsi-zone-2
and click
OK
.
h. Click
Activate
to activate the new zone set.
i. Click
Continue Activation
to finish the activation.
Step 11 Bring up the iSCSI hosts (host 1 and host 2).
Step 12 Show all the iSCSI sessions.
a. In Device Manager, choose
Interfaces
>
Monitor
>
Ethernet
.
b. Click the
iSCSI connections
tab to show all the iSCSI sessions.
c. In Device Manager, choose
IP
>
iSCSI
and select the
Session Initiators
tab.
d. Click
Details
.
Step 13 In Cisco DCNM-SAN, choose
End Devices
>
iSCSI
in the Physical Attributes pane to verify the details of the two iSCSI initiators
Step 14 In Cisco DCNM-SAN, choose
Zones
>
Edit Local Full Zone Database
to view the active zone set. The iSCSI initiators' FC IDs are resolved.
Step 15 In Device Manager, Choose
FC
>
Name Server
. The Fibre Channel name server shows the virtual N ports created for the iSCSI hosts.
Step 16 In Device Manager, Choose
FC
>
Name Server
.
Step 17 Click the
Advanced
tab. Verify the detailed output of the iSCSI initiator nodes in the Fibre Channel name server.
Target Storage Device Requiring LUN Mapping Example
This example scenario 2 assumes the following configuration (see Figure 40-23):
-
Access control is based on Fibre Channel zoning.
-
There is target-based LUN mapping or LUN masking.
-
There is no iSCSI authentication (none).
-
The iSCSI initiator is assigned to different VSANs.
Figure 40-23 Target Storage Device with LUN Mapping
To configure scenario 2 (see Figure 40-23), follow these steps:
Step 1 Configure null authentication for all iSCSI hosts.
switch(config)# iscsi authentication none
Step 2 Configure iSCSI to dynamically import all Fibre Channel targets into the iSCSI SAN using auto-generated iSCSI target names.
switch(config)# iscsi import target fc
Step 3 Configure the Gigabit Ethernet interface in slot 7 port 1 with an IPv4 address and enable the interface.
switch(config)# interface gigabitethernet 7/1 switch(config-if)# ip address 10.11.1.1 255.255.255.0 switch(config-if)# no shutdown
Step 4 Configure the iSCSI interface in slot 7 port 1 to identify all dynamic iSCSI initiators by their IP address and enable the interface.
switch(config)# interface iscsi 7/1 switch(config-if)# switchport initiator id ip-address switch(config-if)# no shutdown
Step 5 Configure the Gigabit Ethernet interface in slot 7 port 5 with the IPv4 address and enable the interface.
switch(config)# interface gigabitethernet 7/5 switch(config-if)# ip address 10.15.1.1 255.255.255.0 switch(config-if)# no shutdown
Step 6 Configure the iSCSI interface in slot 7 port 5 to identify all dynamic iSCSI initiators by IP address and enable the interface.
switch(config)# interface iscsi 7/5 switch(config-if)# switchport initiator id ip-address switch(config-if)# no shutdown
Step 7 Add static configuration for each iSCSI initiator.
switch(config)# iscsi initiator name iqn.1987-05.com.cisco:01.e41695d16b1a <-----Host 2 switch(config-iscsi-init)# static pWWN system-assign 1 switch(config-iscsi-init)# static nWWN system-assign switch(config)# iscsi initiator ip address 10.15.1.11 <-----------------------------------Host 1 switch(config-iscsi-init)# static pwwn system-assigned 1 switch(config-iscsi-init)# vsan 2
Note Host 1 is configured in VSAN 2.
Step 8 View the configured WWNs.
Note The WWNs are assigned by the system. The initiators are members of different VSANs.
switch# show iscsi initiator configured iSCSI Node name is iqn.1987-05.com.cisco:01.e41695d16b1a Node WWN is 20:03:00:0b:fd:44:68:c2 Port WWN is 20:02:00:0b:fd:44:68:c2 iSCSI Node name is 10.15.1.11 Port WWN is 20:06:00:0b:fd:44:68:c2
Step 9 Create a zone with host 1.
switch(config)# zone name iscsi-zone-1 vsan 1
Step 10 Add three members to the zone named
iscsi-zone-1
.
Note Fibre Channel storage for zone membership for the iSCSI initiator, either the iSCSI symbolic node name or the pWWN, can be used. In this case, the pWWN is persistent.
-
The following command is based on the symbolic node name.
switch(config-zone)# member symbolic-nodename iqn.1987-05.com.cisco:01.e41695d16b1a
-
The following command is based on the persistent pWWN assigned to the initiator. You can obtain the pWWN from the
show iscsi initiator
output.
switch(config-zone)# member pwwn 20:02:00:0b:fd:44:68:c2
Step 11 Create a zone with host 2 and two Fibre Channel targets.
Note If the host is in VSAN 2, the Fibre Channel targets and zone must also be in VSAN 2.
switch(config)# zone name iscsi-zone-2 vsan 2
Step 12 Activate the zone set in VSAN 2.
switch(config)# zoneset activate name iscsi-zoneset-v2 vsan 2 Zoneset activation initiated. check zone status switch# show zoneset active vsan 2 zoneset name iscsi-zoneset-v2 vsan 2 zone name iscsi-zone-2 vsan 2 * fcid 0x750001 [pwwn 21:00:00:20:37:6f:fe:54] * fcid 0x750101 [pwwn 21:00:00:20:37:a6:a6:5d] pwwn 20:06:00:0b:fd:44:68:c2 <-----------------Host is not online
Step 13 Start the iSCSI clients on both hosts and verify that sessions come up.
Step 14 Display the iSCSI sessions to verify the Fibre Channel target and the configured WWNs.
switch#
show iscsi session
Initiator iqn.1987-05.com.cisco:01.e41695d16b1a
Initiator ip addr (s): 10.11.1.10
Session #1
Discovery session, ISID 00023d000001, Status active
Session #2
Target iqn.1987-05.com.cisco:05.172.22.92.166.07-01.21000020376ffd97
<----
VSAN 1, ISID 00023d000001, Status active, no reservation
|
To Fibre Channel target
|
Step 15 Display the iSCSI initiator to verify the configured nWWN and pWWN.
switch#
show iscsi initiator
iSCSI Node name is iqn.1987-05.com.cisco:01.e41695d16b1a
Initiator ip addr (s): 10.11.1.10
iSCSI alias name: oasis10.cisco.com
|
|
Node WWN is 20:03:00:0b:fd:44:68:c2 (configured)
<----------
Member of vsans: 1
Number of Virtual n_ports: 1
|
The configured nWWN
|
Virtual Port WWN is 20:02:00:0b:fd:44:68:c2 (configured)
<----
Interface iSCSI 7/1, Portal group tag: 0x300
VSAN ID 1, FCID 0x680102
|
The configured pWWN
|
Step 16 Check the Fibre Channel name server.
switch#
show fcns database vsan 1
VSAN 1:
-----------------------------------------------------------------
FCID TYPE PWWN (VENDOR) FC4-TYPE:FEATURE
-----------------------------------------------------------------
0x680001 NL 21:00:00:20:37:6f:fd:97 (Seagate) scsi-fcp:target
|
|
0x680102 N 20:02:00:0b:fd:44:68:c2 (Cisco) scsi-fcp:init iscw
<---
|
iSCSI initiator in name server |
Step 17 Verify the details of the iSCSI initiator's FC ID in the name server.
switch(config)#
show fcns database fcid 0x680102 detail vsan 1
------------------------
VSAN:1 FCID:0x680102
------------------------
port-wwn (vendor) :20:02:00:0b:fd:44:68:c2 (Cisco)
node-wwn :20:03:00:0b:fd:44:68:c2
class :2,3
node-ip-addr :10.11.1.10
ipa :ff ff ff ff ff ff ff ff
fc4-types:fc4_features:scsi-fcp:init iscsi-gw
symbolic-port-name :
symbolic-node-name :iqn.1987-05.com.cisco:01.e41695d16b1a
port-type :N
port-ip-addr :0.0.0.0
fabric-port-wwn :21:81:00:0b:fd:44:68:c0
iSCSI alias name: oasis10.cisco.com
|
|
Step 18 Check the Fibre Channel name server.
switch#
show fcns database vsan 1
VSAN 1:
--------------------------------------------------------------
FCID TYPE PWWN (VENDOR) FC4-TYPE:FEATURE
-----------------------------------------------------------------
0x680001 NL 21:00:00:20:37:6f:fd:97 (Seagate) scsi-fcp:target
|
|
0x680102 N 20:02:00:0b:fd:44:68:c2 (Cisco) scsi-fcp:init isc..w
<-----
|
iSCSI initiator in name server |
Step 19 Verify the details of the iSCSI initiator's FC ID in the name server.
switch(config)# show fcns database fcid 0x680102 detail vsan 1 port-wwn (vendor) :20:02:00:0b:fd:44:68:c2 (Cisco) node-wwn :20:03:00:0b:fd:44:68:c2 ipa :ff ff ff ff ff ff ff ff fc4-types:fc4_features:scsi-fcp:init iscsi-gw symbolic-node-name :iqn.1987-05.com.cisco:01.e41695d16b1a fabric-port-wwn :21:81:00:0b:fd:44:68:c0
Step 20 Verify that zoning has resolved the FC ID for the iSCSI client.
switch# show zoneset active vsan 1 zoneset name iscsi-zoneset-v1 vsan 1 zone name iscsi-zone-1 vsan 1 * fcid 0x680001 [pwwn 21:00:00:20:37:6f:fd:97] * fcid 0x680102 [pwwn 20:02:00:0b:fd:44:68:c2]
Step 21 Verify that the second initiator is connected to the two Fibre Channel targets in VSAN 2.
switch#
show iscsi session initiator 10.15.1.11
Initiator 10.15.1.11
Initiator name iqn.1987-05.com.cisco:01.25589167f74c
Session #1
Target iqn.1987-05.com.cisco:05.172.22.92.166.07-05.21000020376ffe54
<--
VSAN 2, ISID 00023d000001, Status active, no reservation
|
Session to first target
|
Session #2
Target iqn.1987-05.com.cisco:05.172.22.92.166.07-05.2100002037a6a65d
<--
VSAN 2, ISID 00023d000001, Status active, no reservation
|
Session to second target
|
switch#
show iscsi initiator
iSCSI Node name is 10.15.1.11 <--- Initiator ID is the IP address
iSCSI Initiator name: iqn.1987-05.com.cisco:01.25589167f74c
iSCSI alias name: oasis11.cisco.com
|
|
Node WWN is 20:04:00:0b:fd:44:68:c2 (dynamic)
<------------------------
Member of vsans: 2 <---
vsan membership
Number of Virtual n_ports: 1
|
Dynamic WWN as static WWN not assigned
|
Virtual Port WWN is 20:06:00:0b:fd:44:68:c2 (configured)
<---------
Interface iSCSI 7/5, Portal group tag: 0x304
VSAN ID 2, FCID 0x750200
|
Static pWWN for the initiator
|
switch#
show fcns database vsan 2
VSAN 2:
--------------------------------------------------------------------------
FCID TYPE PWWN (VENDOR) FC4-TYPE:FEATURE
--------------------------------------------------------------------------
0x750001 NL 21:00:00:20:37:6f:fe:54 (Seagate) scsi-fcp:target
0x750101 NL 21:00:00:20:37:a6:a6:5d (Seagate) scsi-fcp:target
|
|
0x750200 N 20:06:00:0b:fd:44:68:c2 (Cisco) scsi-fcp:init isc..w
<--
Total number of entries = 3
|
iSCSI initiator entry in name server
|
switch#
show fcns database fcid 0x750200 detail vsan 2
------------------------
VSAN:2 FCID:0x750200
------------------------
port-wwn (vendor) :20:06:00:0b:fd:44:68:c2 (Cisco)
node-wwn :20:04:00:0b:fd:44:68:c2
class :2,3
node-ip-addr :10.15.1.11
ipa :ff ff ff ff ff ff ff ff
fc4-types:fc4_features:scsi-fcp:init iscsi-gw
symbolic-port-name :
symbolic-node-name :10.15.1.11
port-type :N
port-ip-addr :0.0.0.0
fabric-port-wwn :21:91:00:0b:fd:44:68:c0
hard-addr :0x000000
Total number of entries = 1
|
|
switch#
show zoneset active vsan 2
zoneset name iscsi-zoneset-v2 vsan 2
zone name iscsi-zone-2 vsan 2
* fcid 0x750001 [pwwn 21:00:00:20:37:6f:fe:54]
* fcid 0x750101 [pwwn 21:00:00:20:37:a6:a6:5d]
|
|
* fcid 0x750200 [pwwn 20:06:00:0b:fd:44:68:c2]
<-------------------------
|
FC ID resolved for iSCSI initiator
|
To configure this example (see Figure 40-23), follow these steps:
Step 1 Configure null authentication for all iSCSI hosts.
a. In Cisco DCNM-SAN, choose
End Devices
>
iSCSI
in the Physical Attributes pane.
b. Select
none
from the AuthMethod drop-down menu in the Information pane.
c. Click the
Apply Changes
icon.
Step 2 Configure iSCSI to dynamically import all Fibre Channel targets into the iSCSI SAN using auto-generated iSCSI target names.
a. In Device Manager, click
IP
>
iSCSI.
b. Click the
Targets
tab.
c. Check the
Dynamically Import FC Targets
check box.
d. Click
Apply
.
Step 3 Configure the Gigabit Ethernet interface in slot 7 port 1 with an IPv4 address and enable the interface.
a. In Cisco DCNM-SAN, choose
Switches
>
Interfaces
>
Gigabit Ethernet
in the Physical Attributes pane.
b. Select the
IP Address
tab in the Information pane and click
Create Row
.
c. Set the IP address and subnet mask for the Gigabit Ethernet interface in slot 7 port 1.
d. Click
Create
.
e. Click the
General
tab and select
up
from the Admin drop-down menu for the Gigabit Ethernet interface in slot 7 port 1.
f. Click the
Apply Changes
icon.
Step 4 Configure the iSCSI interface in slot 7 port 1 to identify all dynamic iSCSI initiators by their IP address and enable the interface.
a. In Cisco DCNM-SAN, choose
Switches
>
Interfaces
>
FC Logical
in the Physical Attributes pane.
b. Select the
iSCSI
tab in the Information pane.
c. Select
ipaddress
from the Initiator ID Mode drop-down menu and click the
Apply Changes
icon.
d. In Device Manager, choose
Interfaces
>
Ethernet and iSCSI
.
e. Click the
iSCSI
tab.
f. Select
up
from the Admin drop-down menu for the iSCSI interface in slot 7 port 1.
g. Click
Apply
.
Step 5 Configure the Gigabit Ethernet interface in slot 7 port 5 with the IPv4 address and enable the interface.
a. In Cisco DCNM-SAN, choose
Switches
>
Interfaces
>
Gigabit Ethernet
in the Physical Attributes pane.
b. Click the
IP Address
tab in the Information pane and click
Create Row
.
c. Set the IP address and subnet mask for the Gigabit Ethernet interface in slot 7 port 5.
d. Click
Create
.
e. Select the
General
tab and select
up
from the Admin drop-down menu for the Gigabit Ethernet interface in slot 7 port 5.
f. Click the
Apply Changes
icon.
Step 6 Configure the iSCSI interface in slot 7 port 5 to identify all dynamic iSCSI initiators by IP address and enable the interface.
a. In Cisco DCNM-SAN, choose
Switches
>
Interfaces
>
FC Logical
in the Physical Attributes pane.
b. Click the
iSCSI
tab in the Information pane.
c. Select
ipaddress
from the Initiator ID Mode drop-down menu and click the
Apply Changes
icon.
d. In Device Manager, choose
Interfaces
>
Ethernet and iSCSI
.
e. Click the
iSCSI
tab.
f. Select
up
from the Admin drop-down menu for the iSCSI interface in slot 7 port 5.
g. Click
Apply
.
Step 7 Configure for static pWWN and nWWN for host 1.
a. In Device Manager, choose
IP
>
iSCSI
.
b. Click the
Initiators
tab.
c. Check the
Node Address Persistent
and
Node Address System-assigned
check boxes the Host 1 iSCSI initiator.
d. Click
Apply
.
Step 8 Configure for static pWWN for Host 2.
a. In Device Manager, Choose
IP
>
iSCSI
.
b. Click the
Initiators
tab.
c. Right-click on the Host 2 iSCSI initiator and click Edit pWWN.
d. Select 1 from the System-assigned Num field and click
Apply
.
Step 9 View the configured WWNs.
Note The WWNs are assigned by the system. The initiators are members of different VSANs.
a. In Cisco DCNM-SAN, choose
End Devices
>
iSCSI
in the Physical Attributes pane.
b. Click the
Initiators
tab.
Step 10 Create a zone for Host 1 and the iSCSI target in VSAN 1.
Note Use the IP address of the host in zone membership configuration because the iSCSI interface is configured to identify all hosts based on IP address.
a. In Cisco DCNM-SAN, choose
Zones
>
Edit Local Full Zone Database
.
b. Select VSAN 1 from the VSAN drop-down menu in the Edit Local Full Zone Database dialog box.
c. Select the
Zones
folder in the left navigation pane and click
Insert
.
d. Set the Zone Name field to
iscsi-zone-1
and click
OK
.
e. Select the iscsi-zone-1 folder in the left navigation pane and click
Insert
.
f. Set the ZoneBy radio button to
WWN
.
g. Set the Port WWN to the pWWN for the Fibre Channel target (that is, 21:00:00:20:37:6f:fd:97). and click
Add
.
h. Set the ZoneBy radio button to
iSCSI IP Address/Subnet
.
i. Set the IP Address/Mask field to the IP Address for Host 1 iSCSI initiator (10.11.1.10) and click
Add
.
Note Fibre Channel storage for zone membership for the iSCSI initiator, either the iSCSI symbolic node name or the pWWN, can be used. In this case, the pWWN is persistent.
Step 11 Create a zone set in VSAN 1 and activate it.
a. In Cisco DCNM-SAN, choose
Zones
>
Edit Local Full Zone Database
.
b. Select VSAN 1 from the VSAN drop-down menu in the Edit Local Full Zone Database dialog box.
c. Select the
Zoneset
folder in the left navigation pane and click
Insert
.
d. Set the Zoneset Name to
zonset-iscsi-1
and click
OK
.
e. Click on the
zoneset-iscsi-1
folder and click
Insert
.
f. Set the Zone Name field to
iscsi-zone-1
and click
OK
.
g. Click
Activate
to activate the new zone set.
h. Click
Continue Activation
to finish the activation.
Step 12 Create a zone with host 2 and two Fibre Channel targets.
Note If the host is in VSAN 2, the Fibre Channel targets and zone must also be in VSAN 2.
Note iSCSI interface is configured to identify all hosts based on node name.
a. In Cisco DCNM-SAN, choose
Zones
>
Edit Local Full Zone Database
.
b. Select VSAN 2 from the VSAN drop-down menu in the Edit Local Full Zone Database dialog box.
c. Select the
Zones
folder in the left navigation pane and click
Insert
.
d. Set the Zone Name field to
iscsi-zone-2
and click
OK
.
e. Select the
iscsi-zone-2
folder in the left navigation pane and click
Insert
.
f. Set the ZoneBy radio button to
WWN
.
g. Set the Port WWN to the pWWN for one of the Fibre Channel targets (for example, 21:00:00:20:37:6f:fe:5) and click
Add
.
h. Set the Port WWN to the pWWN for another of the Fibre Channel targets (for example, 21:00:00:20:37:a6:a6:5d) and click
Add
.
i. Set the ZoneBy radio button to
iSCSI IP Address/Subnet
.
j. Set the IP Address/Mask field to the IP Address for Host 2 iSCSI initiator (10.15.1.11) and click
Add
.
Step 13 Create a zone set in VSAN 2 and activate it.
a. In Cisco DCNM-SAN, choose
Zones
>
Edit Local Full Zone Database
.
b. Select VSAN 2 from the VSAN drop-down menu in the Edit Local Full Zone Database dialog box.
c. Select the
Zoneset
folder in the left navigation pane and click
Insert
.
d. Set the Zoneset Name to
zonset-iscsi-2
and click
OK
.
e. Click on the
zoneset-iscsi-2
folder and click
Insert
.
f. Set the Zone Name field to
iscsi-zone-2
and click
OK
.
g. Click
Activate
to activate the new zone set.
h. Click
Continue Activation
to finish the activation.
Step 14 Start the iSCSI clients on both hosts.
Step 15 Show all the iSCSI sessions.
a. In Device Manager, choose
Interface
>
Monitor
>
Ethernet
and select the
iSCSI connections
tab to show all the iSCSI sessions.
b. In Device Manager, choose
IP
>
iSCSI
and select the
Session Initiators
tab.
c. Click
Details
.
Step 16 In Cisco DCNM- SAN, choose
End Devices
>
iSCSI
in the Physical Attributes pane to verify the details of the two iSCSI initiators.
Step 17 In Cisco DCNM-SAN, choose
Zones
> E
dit Local Full Zone Database
to view the active zone set. The iSCSI initiators' FC IDs are resolved.
Step 18 In Device Manager, choose
FC
>
Name Server
. The Fibre Channel name server shows the virtual N ports created for the iSCSI hosts.
Step 19 In Device Manager, Choose
FC
>
Name Server.
Step 20 Click the
Advanced
tab. Verify the detailed output of the iSCSI initiator nodes in the Fibre Channel name server.