[c-nsp] ASR920 port based xconnect equivalent

[James Jun]

On Tue, Jun 07, 2016 at 11:50:58AM +0000, Adam Vitkovsky wrote:
> >  service instance 1 ethernet
> >   encapsulation default
> >   l2protocol tunnel cdp stp vtp
> -isn't L2PT required only in case the providers network is actually L2 switched environment (running STP internally)?

No; ASR 920 (and 903/902 too) does intercept and absorb L2PT packets on EPL/EVPL EFPs as we found out the other day, when cross-connecting a user to Amazon.

The only way to prevent it is to 'l2protocol (tunnel|forward)'.  We use 'forward' since we don't have L2 switched environment as uplink.

James