Configuring Trunk Mode - Cisco nexus 5000 series Cli Configuration Manual

Configuring VSAN Trunking
S e n d f e e d b a c k t o n x 5 0 0 0 - d o c f e e d b a c k @ c i s c o . c o m
Table 1-1
Your Trunk Mode Configuration
Switch 1
Off
Auto
Tip The preferred configuration on the Cisco 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.

Configuring Trunk Mode

To configure trunk mode, perform this task:
Command
Step 1
switch# configuration terminal
Step 2
switch(config)# interface fc slot/port
switch(config-if)#
Step 3
switch(config-if)# switchport trunk mode on
switch(config-if)# switchport trunk mode off
switch(config-if)# switchport trunk mode auto
About Trunk-Allowed VSAN Lists
Each Fibre Channel interface has an associated trunk-allowed VSAN list. In TE-port mode, frames are
transmitted and received in one or more VSANs specified in this list. By default, the complete VSAN
range (1 through 4093) is included in the trunk-allowed list.
The common set of VSANs that are configured and active in the switch are included in the trunk-allowed
VSAN list for an interface, and they are called allowed-active VSANs. The trunking protocol uses the
list of allowed-active VSANs at the two ends of an ISL to determine the list of operational VSANs in
which traffic is allowed.
In Figure
VSANs 1, 2, 4, and 5 with a default configuration of trunk-allowed VSANs. All VSANs configured in
all three switches are allowed-active. However, only the common set of allowed-active VSANs at the
ends of the ISL become operational as shown in
Cisco Nexus 5000 Series Switch CLI Software Configuration Guide
1-4
Trunk Mode Status Between Switches (continued)
Switch 2
Auto, on, or off
Auto
1-4, switch 1 has VSANs 1 through 5, switch 2 has VSANs 1 through 3, and switch 3 has
Chapter 1
Resulting State and Port Mode
Trunking State
No trunking (ISL)
No trunking (ISL)
Purpose
Enters configuration mode.
Configures the specified interface.
Enables (default) the trunk mode for the
specified interface.
Disables the trunk mode for the specified
interface.
Configures the trunk mode to auto mode, which
provides automatic sensing for the interface.
Figure 1-4.
Configuring VSAN Trunking
Port Mode
E port
E port
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