Cisco 7604 - Page 154

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Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
OL-4266-08
Chapter 10 Configuring LAN Ports for Layer 2 Switching
Configuring LAN Interfaces for Layer 2 Switching
• To support the switchport nonegotiate command, you must enter the switchport mode trunk
command.
• Enter the switchport mode dynamic trunk command. See Table 10-2 on page 10-4 for information
about trunking modes.
• Before entering the switchport nonegotiate command, you must configure the encapsulation (see
the “Configuring the Layer 2 Switching Port as an ISL or 802.1Q Trunk” section on page 10-8) and
configure the port to trunk unconditionally with the switchport mode trunk command (see the
“Configuring the Layer 2 Trunk to Use DTP” section on page 10-9).
Note Complete the steps in the “Completing Trunk Configuration” section on page 10-12 after performing the
tasks in this section.
Configuring the Access VLAN
Note Complete the steps in the “Configuring a LAN Port for Layer 2 Switching” section on page 10-7 before
performing the tasks in this section.
To configure the access VLAN, perform this task:
Note Complete the steps in the “Completing Trunk Configuration” section on page 10-12 after performing the
tasks in this section.
Configuring the 802.1Q Native VLAN
Note Complete the steps in the “Configuring a LAN Port for Layer 2 Switching” section on page 10-7 before
performing the tasks in this section.
To configure the 802.1Q native VLAN, perform this task:
Command Purpose
Router(config-if)# switchport access vlan vlan_ID
(Optional) Configures the access VLAN, which is used if the
interface stops trunking. The vlan_ID value can be 1 through
4094, except reserved VLANs (see Table 14-1 on page 14-2).
Router(config-if)# no switchport access vlan
Reverts to the default value (VLAN 1).
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).