Table Of Contents
Configuring Fibre Channel Routing Services and Protocols
FSPF Features
FSPF Examples
Fault Tolerant Fabric
Redundant Links
Configuring FSPF Globally
Deleting the Entire FSPF Configuration
Disabling FSPF Routing Protocols
Link State Record Defaults
Configuring FSPF for a Specific Interface
Computing Route Cost
Specifying Hello Time Intervals
Specifying Dead Intervals
Disabling FSPF for Specific Interfaces
Retransmitting Intervals
Configuring Fibre Channel Routes
Clearing FSPF Counters
Broadcast Routing
In-Order Delivery
Reordering Network Frames
Reordering PortChannel Frames
Enabling In-Order Delivery
Configuring the Drop Latency Time
Displaying Latency Information
Configuring Flow Statistics
Clearing FIB Statistics
Displaying Flow Statistics
Displaying Routing and Forwarding Information
Displaying Global FSPF Information
Displaying the FSPF Database
Displaying FSPF Interfaces
Default Settings
Configuring Fibre Channel Routing Services and Protocols
Fabric Shortest Path First (FSPF) is the standard path selection protocol used by Fibre Channel fabrics. The FSPF feature is enabled by default on all Fibre Channel switches. Except in configurations that require special consideration, you do not need to configure any FSPF services. FSPF automatically calculates the best path between any two switches in a fabric. Specifically, FSPF is used to:
•Dynamically compute routes throughout a fabric by establishing the shortest and quickest path between any two switches.
•Select an alternative path in the event of the failure of a given path.
–FSPF supports multiple paths.
–FSPF automatically computes an alternative path around a failed link. It provides a preferred route when two equal paths are available.
This chapter provides details on Fibre Channel routing services and protocols. It includes the following sections:
•FSPF Features
•FSPF Examples
•Configuring FSPF Globally
•Configuring FSPF for a Specific Interface
•Configuring Fibre Channel Routes
•Clearing FSPF Counters
•Broadcast Routing
•In-Order Delivery
•Configuring Flow Statistics
•Displaying Routing and Forwarding Information
•Default Settings
FSPF Features
FSPF is the protocol currently standardized by the T11 committee for routing in Fibre Channel networks. The FSPF protocol has the following characteristics and features:
•Supports multipath routing.
•Bases path status on a link state protocol.
•Routes hop by hop, based only on the domain ID.
•Runs only on E ports or TE ports and provides a loop free topology.
•Runs on a per VSAN basis. Connectivity in a given VSAN in a fabric is guaranteed only for the switches configured in that VSAN.
•Uses a topology database to keep track of the state of the links on all switches in the fabric and associates a cost with each link.
•Guarantees a fast reconvergence time in case of a topology change. Uses the standard Dijkstra's algorithm, but there is a static dynamic option for a more robust, efficient, and incremental Dijkstra's algorithm. The reconvergence time is fast and efficient as the route computation is done on a per VSAN basis.
FSPF Examples
Note The FSPF feature can be used on any topology.
Fault Tolerant Fabric
Figure 15-1 Fault Tolerant Fabric
For example, if all links are of equal speed, the FSPF calculates two equal paths from A to C: A-D-C (green) and A-E-C (blue).
Redundant Links
To further improve on the topology in Figure 15-1, each connection between any pair of switches can be replicated; two or more links can be present between a pair of switches. Figure 15-2 shows this arrangement. Because switches in the Cisco MDS 9000 Family support PortChanneling, each pair of physical links can appear to the FSPF protocol as one single logical link.
By bundling pairs of physical links, FSPF efficiency is considerably improved by the reduced database size and the frequency of link updates. Once physical links are aggregated, failures are not attached to a single link but to the entire PortChannel. This configuration also improves the resiliency of the network. The failure of a link in a PortChannel does not trigger a route change, thereby reducing the risks of routing loops, traffic loss, or fabric downtime for route reconfiguration.
Figure 15-2 Fault Tolerant Fabric with Redundant Links
For example, if all links are of equal speed and no PortChannels exist, the FSPF calculates four equal paths from A to C: A1-E-C, A2-E-C, A3-D-C, and A4-D-C. If PortChannels exist, these paths are reduced to two.
Configuring FSPF Globally
Some FSPF features can be globally configured in each VSAN. By configuring a feature for the entire VSAN, you don't have to specify the VSAN number for every command. This global configuration feature also reduces the chance of typing errors or other minor configuration errors.
Note FSPF is enabled by default. Generally, you do not need to configure these advanced features.
Caution The default for the backbone region is 0 (zero). You do not need to change this setting unless your region is different from the default. If you are operating with other vendors using the backbone region, you can change this default to be compatible with those settings.
To configure a FSPF feature for the entire VSAN, follow these steps:
|
Command
|
Purpose
|
Step 1
|
|
Enters configuration mode.
|
Step 2
|
switch(config)# fspf config vsan 1
switch-config-(fspf-config)#
|
Enters FSPF global configuration mode for the specified VSAN.
|
Step 3
|
switch-config-(fspf-config)# spf static
switch-config-(fspf-config)#
|
Forces static SPF computation for the dynamic (default) incremental VSAN.
|
Step 4
|
switch-config-(fspf-config)# spf hold-time 10
switch-config-(fspf-config)#
|
Configures the hold time between two route computations in milliseconds for the entire VSAN. The default value is 0.
Note If the specified time is shorter, the routing is faster. However, the processor consumption increases accordingly.
|
Step 5
|
switch-config-(fspf-config)# region 7
switch-config-(fspf-config)#
|
Configures the autonomous region for this VSAN and specifies the region ID (7).
|
Deleting the Entire FSPF Configuration
To delete FSPF configuration for the entire VSAN, follow these steps:
|
Command
|
Purpose
|
Step 1
|
|
Enters configuration mode.
|
Step 2
|
switch(config)# no fspf config vsan 3
|
Deletes the FSPF configuration for VSAN 3.
|
Disabling FSPF Routing Protocols
By default, FSPF is enabled on switches in the Cisco MDS 9000 Family.
To enable or disable FSPF routing protocols, follow these steps:
|
Command
|
Purpose
|
Step 1
|
|
Enters configuration mode.
|
Step 2
|
switch(config)# no fspf enable vsan 5
|
Disables FSPF routing protocol in VSAN 5.
|
switch(config)# fspf enable vsan 7
|
Enables FSPF routing protocol in VSAN 7.
|
Link State Record Defaults
Each time a new switch enters the fabric, a link state record (LSR) is sent to the neighboring switches, and then flooded throughout the fabric. Table 15-1 displays the default settings for switch responses.
Table 15-1 LSR Default Settings
LSR Option
|
Default
|
Description
|
Acknowledgement interval (RxmtInterval)
|
5 seconds
|
The time a switch waits for an acknowledgement from the LSR before retransmission.
|
Refresh time (LSRefreshTime)
|
30 minutes
|
The time a switch waits before sending an LSR refresh transmission.
|
Maximum age (MaxAge)
|
60 minutes
|
The time a switch waits before dropping the LSR from the database.
|
Configuring FSPF for a Specific Interface
Several FSPF commands are available on a per interface basis. The following configuration procedures apply to an interface in a specific VSAN and are described in this section.
•Computing Route Cost
•Specifying Hello Time Intervals
•Specifying Dead Intervals
•Disabling FSPF for Specific Interfaces
•Retransmitting Intervals
Computing Route Cost
FSPF tracks the state of links on all switches in the fabric, associates a cost with each link in its database, and then chooses the path with a minimal cost. The cost associated with an interface can be administratively changed to implement the FSPF route selection. The integer value to specify cost can range from 1 to 65,535. The default cost for 1Gbps is 1000 and 2Gbps is 500.
To configure FSPF link cost, follow these steps:
|
Command
|
Purpose
|
Step 1
|
|
Enters configuration mode.
|
Step 2
|
switch(config)# interface fc1/4
|
Configures the specified interface, or if already configured, enters configuration mode for the specified interface.
|
Step 3
|
switch(config-if)# fspf cost 5 vsan 90
|
Configures the cost for the selected interface in VSAN 90.
|
Specifying Hello Time Intervals
You can set the FSPF hello time interval to specify the interval between the periodic hello messages sent to verify the health of the link. The integer value can range from 1 to 65,535 seconds.
Note This value must be the same in the ports at both ends of the ISL.
To configure the FSPF Hello time interval, follow these steps:
|
Command
|
Purpose
|
Step 1
|
|
Enters configuration mode.
|
Step 2
|
switch(config)# interface fc1/4
|
Configures the specified interface, or if already configured, enters configuration mode for the specified interface.
|
Step 3
|
switch(config-if)# fspf hello-interval 15 vsan 175
|
Specifies the hello message interval (15 seconds) to verify the health of the link in VSAN 175. The default is 20 seconds.
|
Specifying Dead Intervals
You can set the FSPF dead time interval to specify the maximum interval for which a hello message must be received before the neighbor is considered lost and removed from the database. The integer value can range from 1 to 65,535 seconds.
Note This value must be the same in the ports at both ends of the ISL.
Caution An error is reported at the command prompt if the configured dead time interval is less than the Hello time interval.
To configure the FSPF dead time interval, follow these steps:
|
Command
|
Purpose
|
Step 1
|
|
Enters configuration mode.
|
Step 2
|
switch(config)# interface fc1/4
|
Configures the specified interface, or if already configured, enters configuration mode for the specified interface.
|
Step 3
|
switch(config-if)# fspf dead-interval 25
vsan 7
|
Specifies the maximum interval for VSAN 7 before which a Hello message must be received on the selected interface before the neighbor is considered lost. The default is 80 seconds.
|
Disabling FSPF for Specific Interfaces
You can disable the FSPF protocol for selected interfaces. By default, FSPF is enabled on all E ports and TE ports. This default can be disabled by setting the interface as passive.
Note FSPF must be enabled at both ends of the interface for the protocol to work.
To disable FSPF for a specific interface, follow these steps:
|
Command
|
Purpose
|
Step 1
|
|
Enters configuration mode.
|
Step 2
|
switch(config)# interface fc1/4
|
Configures a specified interface, or if already configured, enters configuration mode for the specified interface.
|
Step 3
|
switch(config-if)# fspf passive vsan 1
|
Disables the FSPF protocol for the specified interface in the specified VSAN.
|
switch(config-if)# no fspf passive vsan 1
|
Reenables the FSPF protocol for the specified interface in the specified VSAN.
|
Retransmitting Intervals
You can specify the time after which an unacknowledged link state update should be transmitted on the interface. The integer value to specify retransmit intervals can range from 1 to 65,535 seconds.
Note This value must be the same on the switches on both ends of the interface.
To configure the FSPF retransmit time interval, follow these steps:
|
Command
|
Purpose
|
Step 1
|
|
Enters configuration mode.
|
Step 2
|
switch(config)# interface fc1/4
|
Configures the specified interface, or if already configured, enters configuration mode for the specified interface.
|
Step 3
|
switch(config-if)# fspf retransmit-interval
15 vsan 12
|
Specifies the retransmit time interval for unacknowledged link state updates in VSAN 12. The default is 5 seconds.
|
Configuring Fibre Channel Routes
Each port implements forwarding logic, which forwards frames based on its FC ID. To configure the FC ID for the specified interface and domain, you can configure the specified route (for example FC ID 111211 and domain ID 3) in the switch with domain ID 1 (see Figure 15-3).
Figure 15-3 Fibre Channel Routes
Note Other than in VSANs, run time checks are not performed on configured and suspended static routes.
To configure an FC route, follow these steps:
|
Command
|
Purpose
|
Step 1
|
|
Enters configuration mode.
|
Step 2
|
switch(config)# fcroute 0x111211
interface fc1/1 domain 3 vsan 2
|
Configures the route for the specified Fibre Channel interface and domain. In this example, interface fc1/1 is assigned an FC ID (0x111211) and a domain ID (3) to the next hop switch.
|
switch(config)# fcroute 0x111211
interface port-channel 1 domain 3 vsan 4
|
Configures the route for the specified PortChannel interface and domain. In this example, interface port-channel 1 is assigned an FC ID (0x111211) and a domain ID (3) to the next hop switch.
|
switch(config)# fcroute 0x031211
interface fc1/1 domain 3 metric 1 vsan 1
|
Configures the static route for a specific FC ID and next hop domain ID and also assigns the cost of the route.
If the remote destination option is not specified, the default is direct.
|
switch(config)# fcroute 0x111112
interface fc1/1 domain 3 metric 3 remote
vsan 3
|
Adds a static route to the RIB. If this is an active route and the FIB1 records are free, it is also added to the FIB.
If the cost (metric) of the route is not specified, the default is 10.
|
Step 3
|
switch(config)# fcroute 0x610000
0xff0000 interface fc 1/1 domain 1 vsan
2
|
Configures the netmask for the specified route in interface fc1/1 (or PortChannel). You can specify one of three routes: ff0000 matches only the domain, ffff00 matches the domain and the area, ffffff matches the domain, area, and port.
|
Clearing FSPF Counters
To clear the FSPF statistics counters for one interface or for the entire VSAN, follow this step:
|
Command
|
Purpose
|
Step 1
|
switch# clear fspf counters vsan 1
|
Clears the FSPF statistics counters for the specified VSAN. If an interface reference is not specified, all counters are cleared.
|
switch# clear fspf counters vsan 200 interface fc1/1
|
Clears the FSPF statistics counters for the specified interface in VSAN 200.
|
Broadcast Routing
Broadcast in a Fibre Channel fabric uses the concept of a distribution tree to reach all switches in the fabric (for broadcast traffic).
FSPF provides the topology information to compute the distribution tree. Fibre Channel defines 256 multicast groups and one broadcast address for each VSAN. Switches in the Cisco MDS 9000 Family only use broadcast routing. By default, they use the principal switch as the root node to derive the distribution tree information. The protocols create a loop-free broadcast distribution tree.
Caution All switches in the fabric should run the same multicast and broadcast distribution tree algorithm to ensure the same distribution tree.
In-Order Delivery
In-order delivery of data frames guarantees frame delivery to a destination in the same order that they were sent by the originator.
Some Fibre Channel protocols or applications cannot handle out-of-order frame delivery. In these cases, switches in the Cisco MDS 9000 Family preserve frame ordering in the frame flow. The source ID (SID), destination ID (DID), and optionally the originator exchange ID (OX ID) identify the flow of the frame.
In case of a single switch, all frames received by a specific ingress port and destined to a certain egress port are always delivered in the same order in which they were received.
Reordering Network Frames
When you experience a route change in the network. The new selected path may be faster or less congested than the old route (see Figure 15-4).
Figure 15-4 Route Change Delivery
In Figure 15-4, the new path from Switch 1 to Switch 4 is faster. Hence, Frame 3 and Frame 4 may be delivered before Frame 1 and Frame 2.
If the in-order guarantee feature is enabled, the frames within the network are treated as specified below:
•Frames in the network are delivered in the order in which they are transmitted.
•Frames which can not be delivered in-order within the network latency drop period are dropped inside the network.
•The number of dropped frames are reduced by slowing down the traffic at the frame source.
Reordering PortChannel Frames
When a link change occurs in a PortChannel, the frames for the same exchange or the same flow can switch from one path to another faster path (see Figure 15-5).
Figure 15-5 Link Congestion Delivery
In Figure 15-5, the port of the old path (red dot) is congested. Hence Frame 3 and Frame 4 can be delivered before Frame 1 and Frame 2.
When the in-order guarantee feature is enabled, the frames crossing a PortChannel are treated as specified below:
•Frames using the old path are delivered before new frames are accepted.
•Frames which cannot be delivered in-order, through the old path, within the switch latency drop period are dropped.
•The new frames are delivered through the new path after the switch latency drop period has elapsed.
Enabling In-Order Delivery
By default, in-order delivery is disabled on switches in the Cisco MDS 9000 Family.
Tip We recommend that you only enable this feature in a switch when devices are present in the switch that cannot handle any out-of-order frames. Load-balancing algorithms within the Cisco MDS 9000 Family ensure that frames are delivered in order during normal fabric operation. The load-balancing algorithms based on source FC ID, destination FC ID, and exchange ID are enforced in hardware without any performance degradation. However, if the fabric encounters a failure and this feature is enabled, the recovery will be delayed due to an intentional pausing of fabric forwarding to purge the fabric of resident frames that could potentially be forwarded out of order.
Use the show in-order-guarantee command to display the present configuration status:
switch# show in-order-guarantee
inorder delivery is not guaranteed
To enable in-order delivery, follow these steps.
|
Command
|
Purpose
|
Step 1
|
|
Enters configuration mode.
|
Step 2
|
switch(config)# in-order-guarantee
|
Enables in-order delivery in the switch.
|
switch(config)# no in-order-guarantee
|
Reverts the switch to the factory defaults and disables the in-order delivery feature.
|
Configuring the Drop Latency Time
Use this command if you need to change the default latency time for either a network or a switch.
To configure the network and the switch drop latency time, follow these steps.
|
Command
|
Purpose
|
Step 1
|
|
Enters configuration mode.
|
Step 2
|
switch(config)# fcdroplatency network 5000
|
Configures network drop latency time to be 5000 milliseconds for the network. The valid range is 0 to 60000 milliseconds. The default is 2000 milliseconds.
Note The network drop latency must be computed as the sum of all switch latencies of the longest path in the network
|
switch(config)# no fcdroplatency network
4500
|
Removes the current fcdroplatecy network configuration (4500) and reverts the switch to the factory defaults.
|
Step 3
|
switch(config)# fcdroplatency switch 4000
|
Configures switch drop latency time to be 4000 milliseconds for the switch. The valid range is 0 to 60000 milliseconds. The default is 500 milliseconds.
Note The switch drop latency parameter should have the same value in all the switches in the network
|
switch(config)# no fcdroplatency switch
4500
|
Removes the current fcdroplatecy switch configuration (4500) and reverts the switch to the factory defaults.
|
Displaying Latency Information
You can view the configured latency parameters using the show fcdroplatency command (see Example 15-1).
Example 15-1 Displays Administrative Distance
switch# show fcdroplatency
switch latency value:4000 milliseconds
network latency value:5000 milliseconds
Configuring Flow Statistics
Flow statistics count the ingress traffic in the aggregated statistics table. You can collect two kinds of statistics:
•Aggregated flow statistics to count the traffic for a VSAN
•Flow statistics to count the traffic for a source and destination ID pair in a VSAN
If you enable flow counters, you can enable a maximum of 1K entries for aggregate flow and flow statistics. Be sure to assign an unused flow index to a module for each new flow. Flow indexes can be repeated across modules. The number space for flow index is shared between the aggregate flow statistics and the flow statistics.
To count the aggregated flow statistics for a VSAN, follow these steps:
|
Command
|
Purpose
|
Step 1
|
|
Enters configuration mode.
|
Step 2
|
switch(config)# fcflow stats aggregated module 1
index 1005 vsan 1
|
Enables the aggregated flow counter.
|
switch(config)# no fcflow stats aggregated module
1 index 1005 vsan 1
|
Disables the aggregated flow counter.
|
To count the flow statistics for a source and destination FC ID in a VSAN, follow these steps:
|
Command
|
Purpose
|
Step 1
|
|
Enters configuration mode.
|
Step 2
|
switch(config)# fcflow stats module 1 index 1
0x145601 0x5601ff ffffff vsan 1
|
Enables the flow counter.
Note The source ID and the destination ID are specified in the FC ID hex format (for example, 0x123aff). The mask can be one of ff0000 or ffffff.
|
Step 3
|
switch(config)# no fcflow stats aggregated module
2 index 1001 vsan 2
|
Disables the flow counter.
|
Clearing FIB1 Statistics
To clear the aggregated flow counter, use the clear fcflow stats command (see Examples 15-2 and 15-3).
Example 15-2 Clears Aggregated Flow Counters
switch# clear fcflow stats aggregated module 2 index 1
Example 15-3 Clears Flow Counters for Source and Destination FC IDs
switch# clear fcflow stats module 2 index 1
Displaying Flow Statistics
Use the show fcflow stats commands to view flow statistics (see Example 15-4 to 15-6).
Example 15-4 Displays Aggregated fcflow Details for the Specified Module
switch# show fcflow stats aggregated module 2
Idx VSAN # frames # bytes
---- ---- -------- -------
0000 4 387,653 674,235,875
0001 6 34,402 2,896,628
Example 15-5 Displays fcflow Details for the Specified Module
switch# show fcflow stats module 2
Idx VSAN D ID S ID mask # frames # bytes
---- ---- ----------- ----------- ----- -------- -------
0000 4 032.001.002 007.081.012 ff.ff.ff 387,653 674,235,875
0001 6 004.002.001 019.002.004 ff.00.00 34,402 2,896,628
Example 15-6 Displays fcflow Index Usage for the Specified Module
switch# show fcflow stats usage module 2
Displaying Routing and Forwarding Information
You can view specific information about existing Fibre Channel and FSPF configurations at any time from the EXEC mode. The following show commands provide further details on existing Fibre Channel paths and routes (see Examples 15-7 to 15-15).
Note When the number of routes are displayed in the command output, both visible and hidden routes are include in the total number of routes. While the hidden routes are added to the count, they will not be visible.
Example 15-7 Displays Administrative Distance
switch# show fcroute distance
Example 15-8 Displays Multicast Routing Information
switch# show fcroute multicast
VSAN FC ID # Interfaces
---- -------- ------------
Example 15-9 Displays FCID Information for a Specified VSAN
switch# show fcroute multicast vsan 3
---- -------- ------------
Example 15-10 Displays FCID and interface Information for a Specified VSAN
switch# show fcroute multicast 0xffffff vsan 2
---- -------- ------------
Example 15-11 Displays Unicast Routing Information
switch# show fcroute unicast
D:direct R:remote P:permanent V:volatile A:active N:non-active
Protocol VSAN FC ID/Mask RCtl/Mask Flags Hops Cost
-------- ---- -------- -------- ---- ---- ----- ------ ----
static 1 0x010101 0xffffff 0x00 0x00 D P A 1 10
static 2 0x111211 0xffffff 0x00 0x00 R P A 1 10
fspf 3 0x610000 0xff0000 0x00 0x00 D P A 4 500
static 4 0x040101 0xffffff 0x00 0x00 R P A 1 103
static 4 0x040102 0xffffff 0x00 0x00 R P A 1 103
static 4 0x040103 0xffffff 0x00 0x00 R P A 1 103
static 4 0x040104 0xffffff 0x00 0x00 R P A 1 103
static 4 0x111211 0xffffff 0x00 0x00 D P A 1 10
Example 15-12 Displays Unicast Routing Information for a Specified VSAN
switch# show fcroute unicast vsan 4
D:direct R:remote P:permanent V:volatile A:active N:non-active
Protocol VSAN FC ID/Mask RCtl/Mask Flags Hops Cost
-------- ---- -------- -------- ---- ---- ----- ------ ----
static 4 0x040101 0xffffff 0x00 0x00 R P A 1 103
static 4 0x040102 0xffffff 0x00 0x00 R P A 1 103
static 4 0x040103 0xffffff 0x00 0x00 R P A 1 103
static 4 0x040104 0xffffff 0x00 0x00 R P A 1 103
static 4 0x111211 0xffffff 0x00 0x00 D P A 1 10
Example 15-13 Displays Unicast Routing Information for a Specified FCID
switch# show fcroute unicast 0x040101 0xffffff vsan 4
D:direct R:remote P:permanent V:volatile A:active N:non-active
Protocol VSAN FC ID/Mask RCtl/Mask Flags Hops Cost
-------- ---- -------- -------- ---- ---- ----- ------ ----
static 4 0x040101 0xffffff 0x00 0x00 R P A 1 103
Example 15-14 Displays Route Database Information
switch# show fcroute summary
FC Route Database Created Thu Feb 13 07:21:52 2003
VSAN Ucast Mcast Label Last Modified Time
----- -------- -------- -------- ------------------------
1 5 1 0 Thu Feb 13 10:21:06 2003
2 4 1 0 Thu Feb 13 10:21:07 2003
3 4 1 0 Thu Feb 13 10:21:08 2003
4 4 1 0 Thu Feb 13 10:21:09 2003
5 4 1 0 Thu Feb 13 10:21:10 2003
6 4 1 0 Thu Feb 13 10:21:11 2003
7 4 1 0 Thu Feb 13 10:21:12 2003
8 4 1 0 Thu Feb 13 10:21:13 2003
9 4 1 0 Thu Feb 13 10:21:14 2003
10 4 1 0 Thu Feb 13 10:21:15 2003
11 4 1 0 Thu Feb 13 10:21:16 2003
12 4 1 0 Thu Feb 13 10:21:17 2003
13 4 1 0 Thu Feb 13 10:21:18 2003
14 4 1 0 Thu Feb 13 10:21:18 2003
15 4 1 0 Thu Feb 13 10:21:19 2003
----- -------- -------- -------- ------------------------
Example 15-15 Displays Route Database Information for a Specified VSAN
switch# show fcroute summary vsan 5
FC Route Database Created Thu Feb 13 07:21:52 2003
VSAN Ucast Mcast Label Last Modified Time
----- -------- -------- -------- ------------------------
5 4 1 0 Thu Feb 13 10:21:10 2003
----- -------- -------- -------- ------------------------
Displaying Global FSPF Information
The show fspf command (see Example 15-16) displays global FSPF information for a specific VSAN:
•the domain number of the switch
•the autonomous region for the switch
•Min_LS_arrival: the minimum time that must elapse before the switch accepts LSR updates
•Min_LS_interval: the minimum time that must elapse before the switch can transmit an LSR
•LS_refresh_time: the interval lapse between refresh LSR transmissions
•Max_age: the maximum time aa LSR can stay before being deleted
Example 15-16 Displays FSPF Information for a Specified VSAN
FSPF routing administration status is enabled
FSPF routing operational status is UP
It is an intra-domain router
MinLsArrival = 1000 msec , MinLsInterval = 5000 msec
Local Domain is 0x65(101)
Number of LSRs = 3, Total Checksum = 0x0001288b
LS_REFRESH_TIME = 1800 sec
Number of LSR that reached MaxAge = 0
Number of SPF computations = 7
Number of Checksum Errors = 0
Number of Transmitted packets : LSU 65 LSA 55 Hello 474 Retranmsitted LSU 0
Number of received packets : LSU 55 LSA 60 Hello 464 Error packets 10
Displaying the FSPF Database
The show fspf database command displays a summary of the FSPF database for a specified VSAN (see Example 15-17). If other parameters are not specified, all LSRs in the database are displayed:
•LSR Type
•Domain ID of the LSR owner
•Domain ID of the advertising router
•LSR age
•LS incarnation member
•Number of links
You could narrow the display to obtain specific information by issuing additional parameters for the domain ID of the LSR owner. For each interface, the following information is also available:
•Domain ID of the neighboring switch
•E port index
•Port index of the neighboring switch
•Link type and cost
Example 15-17 Displays FSPF Database Information
switch# show fspf database vsan 1
FSPF Link State Database for VSAN 1 Domain 0x0c(12)
Advertising domain ID = 0x0c(12)
LSR Incarnation number = 0x80000024
NbrDomainId IfIndex NbrIfIndex Link Type Cost
-----------------------------------------------------------------------------
0x65(101) 0x0000100e 0x00001081 1 500
0x65(101) 0x0000100f 0x00001080 1 500
FSPF Link State Database for VSAN 1 Domain 0x65(101)
Advertising domain ID = 0x65(101)
LSR Incarnation number = 0x80000028
NbrDomainId IfIndex NbrIfIndex Link Type Cost
-----------------------------------------------------------------------------
0xc3(195) 0x00001085 0x00001095 1 500
0xc3(195) 0x00001086 0x00001096 1 500
0xc3(195) 0x00001087 0x00001097 1 500
0xc3(195) 0x00001084 0x00001094 1 500
0x0c(12) 0x00001081 0x0000100e 1 500
0x0c(12) 0x00001080 0x0000100f 1 500
FSPF Link State Database for VSAN 1 Domain 0xc3(195)
Advertising domain ID = 0xc3(195)
LSR Incarnation number = 0x80000033
NbrDomainId IfIndex NbrIfIndex Link Type Cost
-----------------------------------------------------------------------------
0x65(101) 0x00001095 0x00001085 1 500
0x65(101) 0x00001096 0x00001086 1 500
0x65(101) 0x00001097 0x00001087 1 500
0x65(101) 0x00001094 0x00001084 1 500
Displaying FSPF Interfaces
The show fspf command displays the following information for each selected interface (see Example 15-18).
•link cost
•timer values
•neighbor's domain ID (if known)
•local interface number
•remote interface number (if known)
•FSPF state of the interface
•interface counters
Example 15-18 Displays FSPF Interface Information
switch# show fspf vsan 1 interface fc1/1
FSPF interface fc1/1 in VSAN 1
FSPF routing administrative state is active
Timer intervals configured, Hello 20 s, Dead 80 s, Retransmit 5 s
Neighbor Domain Id is 0x0c(12), Neighbor Interface index is 0x0f100000
Number of packets received : LSU 8 LSA 8 Hello 118 Error packets 0
Number of packets transmitted : LSU 8 LSA 8 Hello 119 Retransmitted LSU 0
Number of times inactivity timer expired for the interface = 0
Default Settings
Table 15-2 lists the default settings for FSPF features.
Table 15-2 Default FSPF Settings
Parameters
|
Default
|
FSPF
|
Enabled on all E ports and TE ports.
|
SPF computation
|
Dynamic.
|
SPF hold time
|
0.
|
Backbone region
|
0.
|
Acknowledgement interval (RxmtInterval)
|
5 seconds.
|
Refresh time (LSRefreshTime)
|
30 minutes.
|
Maximum age (MaxAge)
|
60 minutes.
|
Hello interval
|
20 seconds.
|
Dead interval
|
80 seconds.
|
Distribution tree information
|
Derived from the principal switch (root node).
|
Routing table
|
FSPF stores up to 16 equal cost paths to a given destination.
|
Load balancing
|
Based on destination ID and source ID on different, equal cost paths.
|
In-order delivery
|
Disabled.
|
Drop latency
|
Disabled.
|
Static route cost
|
If the cost (metric) of the route is not specified, the default is 10.
|
Remote destination switch
|
If the remote destination switch is not specified, the default is direct.
|
1 FIB = Forwarding Information Base