Cisco Catalyst X4232 Installation And Configuration Note page 56

Configuring the Module for InterVLAN Routing
Note
router(config)# interface gigabitethernet3.1
router(config-subif)# encapsulation dot1Q 1 native
router(config-subif)# exit
router(config)# interface gigabitethernet3.2
router(config-subif)# encapsulation dot1Q 2
router(config-subif)# ip address ip_address subnet_mask
router(config-subif)# exit
router(config)# interface gigabitethernet3.3
router(config-subif)# encapsulation dot1Q 3
router(config-subif)# ip address ip_address subnet_mask
router(config-subif)# exit
router(config)# interface gigabitethernet3.4
router(config-subif)# encapsulation dot1Q 4
router(config-subif)# ip address ip_address subnet_mask
router(config-subif)# exit
router(config)# interface gigabitethernet3.5
router(config-subif)# encapsulation dot1Q 5
router(config-subif)# ip address ip_address subnet_mask
router(config-subif)# exit
router(config)# interface gigabitethernet4.6
router(config-subif)# encapsulation dot1Q 6 native
router(config-subif)# ip address ip_address subnet_mask
router(config-subif)# exit
router(config)# interface gigabitethernet4.7
router(config-subif)# encapsulation dot1Q 7
router(config-subif)# ip address ip_address subnet_mask
router(config-subif)# exit
router(config)# interface gigabitethernet4.8
router(config-subif)# encapsulation dot1Q 8
router(config-subif)# ip address ip_address subnet_mask
router(config-subif)# exit
router(config)# interface gigabitethernet4.9
router(config-subif)# encapsulation dot1Q 9
router(config-subif)# ip address ip_address subnet_mask
router(config-subif)# exit
router(config)# interface gigabitethernet4.10
router(config-subif)# encapsulation dot1Q 10
router(config-subif)# ip address ip_address subnet_mask
router(config-subif)# end
Note
Installation and Configuration Note for the Catalyst 4000 Layer 3 Services Module
56
You are required to use the native keyword with the encapsulation command to
create the subinterface for the native VLAN. In this example, VLANs 1 and 6 are
the native VLANs for each trunk.
You must configure a subinterface as a native VLAN for each physical interface,
otherwise the main interface (g3 or g4) will be assigned a native VLAN of 1. If
the native VLANs do not match on both sides of the connection, packets will be
lost.
78-10164-03