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How to configure trunk on the sub-interfaces of an Ether switch module installed in a Cisco router

By Brad Reese on Tue, 03/04/08 - 3:14am.

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This example shows how to configure the FastEthernet port on an 1841 router as a trunking interface.

The Cisco 1841 router has two onboard FastEthernet autosensing interfaces that support 10- or 100-Mbps connections.

The sub interface becomes fa 0/x..

For instance, fa 0/1.2 represents the sub-interface for VLAN 2.

In addition, it is necessary to define the encapsulation as encapsulation dot1q vlan-id.

Hostname(config)#interface FastEthernet0/1
Hostname(config-if)#no ip address

Hostname(config-if)#no shutdown

Hostname(config)#interface FastEthernet0/1.1
Hostname(config-if)#encapsulation dot1Q 1 native
Hostname(config-if)#ip address x.x.y.y < subnet mask >

interface FastEthernet0/1.2
Hostname(config-if)#encapsulation dot1Q 2
Hostname(config-if)#ip address x.x.y.y < subnet mask >

Note:

There is no way to setup the 1841 router to negotiate the trunk.

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By Trainee (not verified) on Thu, 02/19/2009 - 6:20am.

ive testet it on a 1760 router and it works. tank you for this litte help.

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How to configure trunk on the sub-interfaces of an Ether switch module installed in a Cisco router

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