Unable to create sub-interface on 3750E

[craig.hammer]

I am unable to create sub-interfaces on a 3750E running 12.2(35)SE2 (on a gig ethernet interface). Has anyone succesfully done so?

[glen.grant]

Can you elaborate why you are trying to create a sub interface ?

[craig.hammer]

I am attempting to mimic a setup currently in use on a 6500.

We have a gig interface connected to a MAN, with multiple endpoints. The subinterfaces are used to encapsulate using 802.1q.

[Edison Ortiz]

Why would you need to create subinterfaces in a switch ?

You should create SVIs (Switch Virtual Interfaces) instead.

interface vlan x

ip address x.x.x.x y.y.y.y

If you want to carry more than one Vlan over that link, configure the switchport as trunk.