Trunking and sub-interfaces on the same switchport

For some reason, I never knew that you could trunk and use a sub-interface on the same port of a Catalyst 6500, so I’m recording it here for personal reference.

What I wanted to achieve was to connect two 7600 routers over an Ethernet pseudowire (E-Line, EoMPLS circuit, AToM circuit, Martini circuit – whatever it’s called these days).   The reason I needed to do so was that the interveninig 6500 routers were only getting a default route via BGP from the 7600s.

Juniper L2Circuit Config

Just posting a basic l2circuit configuration for my own reference… Piece of cake really, but it won’t work unless you use a dynamic routing protocol – the static that I had configured wasn’t enough.