Cisco UCS Manager GUI Configuration Guide, 1.0(2)

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Configuring Named VLANs

This chapter includes the following sections:

Named VLANs
Creating a Named VLAN
Deleting a Named VLAN

Named VLANs

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 need to 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.

Creating a Named VLAN

In a Cisco UCS instance with two fabric interconnects, you can create a named VLAN that is accessible to both fabric interconnects or to only one fabric interconnect.

Important:

You cannot create VLANs with IDs from 3968 to 4048. This range of VLAN IDs is reserved.

Procedure

Step 1

In the Navigation pane, click the LAN tab.

Step 2

On the LAN tab, click the LAN node.

Step 3

In the Work pane, click the VLANs tab.

Step 4

On the icon bar to the right of the table, click +.

If the + icon is disabled, click an entry in the table to enable it.

Step 5

In the Create VLAN dialog box, complete the following fields:

Name	Description
Name field	The name of the virtual LAN. This name can be between 1 and 16 alphanumeric characters. You cannot use spaces or any special characters, and you cannot change this name after the object has been saved.
Configuration options	You can select: Common/Global—This VLAN applies to both fabrics and uses the same configuration parameters in both cases Fabric A—The VLAN only applies to fabric A. Fabric B—The VLAN only applies to fabric B. Both Fabrics Configured Differently—This VLAN applies to both fabrics but it enables you to specify a different VLAN ID for each fabric.
VLAN ID field	Enter a numeric ID for this VLAN. This value can: Be in the range from 1 to 3967 Be in the range from 4049 to 4093 Overlap with other VLAN IDs already defined on the system Important: The VLAN IDs from 3968 to 4048 are reserved. You cannot specify an ID within this range.
Check Overlap button	Click this button to determine whether the VLAN ID overlaps with any other IDs on the system.

Step 6

Click OK.

Cisco UCS Manager GUI adds the VLAN to one of the following VLANs nodes:

The LAN Cloud > VLANs node for a VLAN accessible to both fabric interconnects.
The Fabric_Interconnect_Name > VLANs node for a VLAN accessible to only one fabric interconnect.

Deleting a Named VLAN

If Cisco UCS Manager includes a named VLAN with the same VLAN ID as the one you delete, the VLAN is not removed from the fabric interconnect configuration until all named VLANs with that ID are deleted.