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Cisco 7600 Series Router Cisco IOS Software Configuration Guide—12.1E
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Chapter 7 Configuring LAN Ports for Layer 2 Switching
Configuring LAN Interfaces for Layer 2 Switching
Note Complete the steps in the “Completing Trunk Configuration” section on page 7-13 after performing the
tasks in this section.
Configuring the 802.1Q Native VLAN
Note Complete the steps in the “Preparing a Layer 2 Switching Port for Configuration as a Trunk” section on
page 7-8 before performing the tasks in this section.
To configure the 802.1Q native VLAN, perform this task:
When configuring the native VLAN, note the following syntax information:
• With Release 12.1(13)E and later releases, the vlan_ID value can be 1 to 4094, except for reserved
VLANs (see Table 9-1 on page 9-2).
• With 12.1 E releases earlier than Release 12.1(13)E, the vlan_ID value can be 1 to 1005.
• The access VLAN is not automatically used as the native VLAN.
Note Complete the steps in the “Completing Trunk Configuration” section on page 7-13 after performing the
tasks in this section.
Configuring the List of VLANs Allowed on a Trunk
Note Complete the steps in the “Preparing a Layer 2 Switching Port for Configuration as a Trunk” section on
page 7-8 before performing the tasks in this section.
To configure the list of VLANs allowed on a trunk, perform this task:
Command Purpose
Router(config-if)# switchport trunk native vlan
vlan_ID
(Optional) Configures the 802.1Q native VLAN.
Router(config-if)# no switchport trunk native vlan
Reverts to the default value (VLAN 1).
Command Purpose
Router(config-if)# switchport trunk allowed vlan {add
| except | none | remove} vlan [,vlan[,vlan[,...]]
(Optional) Configures the list of VLANs allowed on the
trunk.
Router(config-if)# no switchport trunk allowed vlan
Reverts to the default value (all VLANs allowed).
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