subinterface configuration on cisco


I have two 1811 running same IOS version and on one of them I cannot seems to configure a sub interface whereas on the other one I can.

I can't really thing of a possible reason why it's not letting me do that.

any advice
Who is Participating?
Craig BeckCommented:
You have two options with the 1811...

1] Create subinterfaces on the two FastEthernet WAN ports,
2] Create SVIs to attach the 8x FastEthernet ports on the switch.

Which interfaces are you trying to apply the config to?

Can you post the show version from each router?
Can you post what you are entering?
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