VLANs
In Cisco UCS, a VLAN, also known as a named VLAN, creates a connection to a specific external LAN. The VLAN isolates traffic to that external LAN, including broadcast traffic.
The name that you assign to a VLAN ID adds a layer of abstraction that allows you to globally update all servers associated with service profiles that use the named VLAN. You do not need to reconfigure the servers individually to maintain communication with the external LAN.
You can create more than one named VLAN with the same VLAN ID. For example, if servers that host business services for HR and Finance must access the same external LAN, you can create VLANs named HR and Finance with the same VLAN ID. Then, if the network is reconfigured and Finance is assigned to a different LAN, you only have to change the VLAN ID for the named VLAN for Finance.
In a cluster configuration, you can configure a named VLAN to be accessible only to one fabric interconnect or to both fabric interconnects.
For more information about VLANs in Cisco UCS, including guidelines and recommendations, see the Cisco UCS Manager configuration guides.
Guidelines for VLAN IDs
Note |
You cannot create VLANs with IDs from 3968 to 4047. This range of VLAN IDs is reserved. |
VLANs in the LAN cloud and FCoE VLANs in the SAN cloud must have different IDs. Using the same ID for a VLAN and an FCoE VLAN in a VSAN results in a critical fault and traffic disruption for all vNICs and uplink ports using that VLAN. Ethernet traffic is dropped on any VLAN that has an ID that overlaps with an FCoE VLAN ID.
The VLAN name is case-sensitive.
Creating a VLAN
In a Cisco UCS domain that is configured for high availability, you can create a VLAN that is accessible to both fabric interconnects or to only one fabric interconnect.
Note |
You cannot create VLANs with IDs from 3968 to 4047. This range of VLAN IDs is reserved. |
Procedure
Step 1 |
Choose . |
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Step 2 |
On Compute page, choose the pod that includes the Cisco UCS Manager account. |
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Step 3 |
Click VLANs. |
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Step 4 |
Click Add. |
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Step 5 |
On the Add VLAN screen, complete the following fields:
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Step 6 |
Click Submit. |