[c-nsp] Tunneling VLANs?

[Rick Ernst]

Is there an IOS/CatOS method to basically tunnel a VLAN trunk across a
Layer-3 boundary?

I have a 5500 with multiple VLANs connected to local RSMs.  The RSMs max
out at 128MB, so I eBGP multi-hop some BGP connections to a 7513.  I'm
thinking about extending the 5500 VLANs through a trunk port into the
upstream switch and back "down" into the 7513. This would simplify the BGP
configuration (at the expense of a tunnel configuraiton).

This requires multiple VLANs on the intervening switch which takes away
from limited number of VLANs available and has the possiblity of VLAN-ID
collisions.  If I could encapsulate the dot1q trunk within IP, I think
that would solve my problem.

My Google/CCO-foo appears to be weak; the only thing I've found that looks
interesting is L2TP, but it doesn't appear to support multiple VLANs.

Thanks,
Rick