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Cisco Nexus 7000 Series NX-OS Interfaces Configuration Guide, Release 5.x
OL-23435-03
Chapter 3 Configuring Layer 2 Interfaces
Configuring Access and Trunk Interfaces
Configuring the Allowed VLANs for Trunking Ports
You can specify the IDs for the VLANs that are allowed on the specific trunk port.
Note The switchport trunk allowed vlan vlan-list command replaces the current VLAN list on the specified
port with the new list. Consequently you are prompted for confirmation before the new list is applied.
As a side effect, if you are doing copy and paste of a large configuration then you may see some failures
as the CLI is waiting for a confirmation before accepting other commands. To avoid this you can disable
prompting using the terminal dont-ask command before you paste the configuration.
BEFORE YOU BEGIN
Before you configure the allowed VLANs for the specified trunk ports, ensure that you are configuring
the correct interfaces and that the interfaces are trunks.
Note Beginning with Cisco Release 5.2, you can change the block of VLANs reserved for internal use. See
the Cisco Nexus 7000 Series NX-OS Layer 2 Switching Configuration Guide, Release 5.x, for more
information about changing the reserved VLANs.
SUMMARY STEPS
1. configure terminal
2. interface {ethernet slot/port | port-channel number}
3. switchport trunk allowed vlan {vlan-list | add vlan-list | all | except vlan-list | none | remove
vlan-list}
4. exit
5. (Optional) show vlan
6. (Optional) copy running-config startup-config
DETAILED STEPS
Command Purpose
Step 1
configure terminal
Example:
switch# configure terminal
switch(config)#
Enters configuration mode.
Step 2
interface {ethernet slot/port |
port-channel number
}
Example:
switch(config)# interface ethernet 3/1
Specifies an interface to configure, and enters interface
configuration mode.
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