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Encapsulation problem

Tricon7 Tricon7 is offline
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Join Date: Sep 2007
Posts: 1
I should be able to create a sub-interface on the router and give it an encapsulation type, like dot1q or isl. But after I've created the sub-interface, there are no encapsulation options. I even typed a "?" at the prompt, and "encapsulation" didn't appear. I'm reading right out of Cisco's book right now, and I know that sequence and procedure is right, so I'm puzzled as to why it won't accept it. And if I try and assign an IP address to a sub-interface, I get the message:

Configuring IP routing on a LAN subinterface is only allowed if that subinterface is already configured as part of an IEEE 802.10 or ISL vLAN.

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