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Posted by Doug McIntyre on January 30, 2008, 11:40 am
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>I'm working through the CCNA & I've reached the point of configuring 802.1Q
>on routers. I have a 2611 router which is connected via a 10Meg ethernet
>connection to my 2650 switch (which in turn is connected to another 2650
>switch). Unfortunately when I try to configure sub interfaces as per the
>text in my book I'm receiving this error message:
>'Configuring IP routing on a LAN subinterface is only allowed if that
>subinterface is already configured as part of an IEEE 802.10, IEEE 802.1Q,
>or ISL vLAN.'
>I've tried many different combinations of commands on the interface &
>subinterfaces but the CLI doesn't even recognise the 'encapsulation'
>command, I'm thinking that something needs to be configured globally but
>I'm not sure, certainly my book hasn't indicated that. I've searched the
>Cisco web site & also my CCNA Command quick reference guide but with no joy
>in solving the problem, can anyone point out where I'm going wrong?
There's only a few IOS images that support 802.1Q encapsulation on
your 2611 router.
Search in the feature navigator for 'IEEE 802.Q VLAN Trunking' feature
for your router.
Part of knowing cisco is knowing their website for finding
information. Find the feature navigator and find the images that
support that feature.. :)
Most likely, you'll have to upgrade to one of the images returned to
support what you want to do.
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