Cisco Nexus 5000 Series Switch Fabric Manager Software Configuration Guide, NX-OS 4.0 (OL-16598-01, June 2008)

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13-3
Nexus 5000 Series Switch Fabric Manager Software Configuration Guide
OL-16598-01
Chapter 13 Configuring VSAN Trunking
Configuring VSAN Trunking
Configuring VSAN Trunking
This section explains how to configure VSAN trunking and includes the following topics:
• Guidelines and Restrictions, page 13-3
• About Trunk Mode, page 13-3
• Configuring Trunk Mode, page 13-4
• About Trunk-Allowed VSAN Lists, page 13-5
• Configuring an Allowed-Active List of VSANs, page 13-6
Guidelines and Restrictions
When configuring VSAN trunking, note the following guidelines:
• We recommend that both ends of a VSAN trunking ISL belong to the same port VSAN. On platforms
or fabric switches where the port VSANs are different, one end returns an error, and the other is not
connected.
• To avoid inconsistent configurations, shut all E ports before enabling or disabling the VSAN
trunking protocol.
About Trunk Mode
By default, trunk mode is enabled in all Fibre Channel interfaces. However, trunk mode configuration
takes effect only in E-port mode. You can configure trunk mode as on (enabled), off (disabled), or auto
(automatic). The default trunk mode is on. The trunk mode configurations at the two ends of the link
determine the trunking state of the link and the port modes at both ends (see Table 13-1).
Tip The preferred configuration on the Nexus 5000 Series switches is that one side of the trunk is set to auto
and the other is set to on.
Note When connected to a third-party switch, the trunk mode configuration has no effect. The ISL is always
in a trunking disabled state.
Table 13-1 Trunk Mode Status Between Switches
Your Trunk Mode Configuration Resulting State and Port Mode
Switch 1 Switch 2 Trunking State Port Mode
On Auto or on Trunking (EISL) TE port
Off Auto, on, or off No trunking (ISL) E port
Auto Auto No trunking (ISL) E port