encap command in sub-if config mode

I just discovered an odd situation with some of our 2600's. We have
several pods. The pod I use the most does not have a problem. But
recently I jumped on a different pod and noticed something strange.
I was trying to work through a lab that deals with inter-vlan routing.
when configging the router, you would setup sub-interfaces to handle
the different vlans.
when you create a subif, you must first specify the encap.
Well this particular router did not have an "encap" command in the
"sub-if" config mode.
the IOS is the same as the one I normally work on, and it has the
"encap" command.
the ios ver is 12.2(12j) on both routers.
is there something I am missing?
A feature set or something?
thanx in advance.
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