802.1q on a 2600 series router

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Jan 23rd, 2008
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I've been wracking my brain on how to enable dot1q on the 2 fastethernet ports in the chassis of the router. No layer 2 networking modules are installed, anyone have any ideas?

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Jon Marshall Wed, 01/23/2008 - 07:36
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Are you saying it doesn't work or you don't know the commands. Config example in brief

int fa0/0.10

encapsulation dot1q 10 <- This must match the vlan number

ip address

int fa0/0.20


Oobviously the switchport that fa0/0 connects to needs to be configured as an 802.1q trunk.

If you do not have the enacapsulation option available under the subinterface bear in mind you need a minimum of IP Plus to run 802.1q.




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