[c-nsp] ASR920 port based xconnect equivalent

Adam Vitkovsky Adam.Vitkovsky at gamma.co.uk
Tue Jun 7 10:58:43 EDT 2016

> James Jun
> Sent: Tuesday, June 07, 2016 2:50 PM
> To: cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] ASR920 port based xconnect equivalent
> 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.
Aah I see, good that I asked.
Oh yeah and the forward vs tunnel.


        Adam Vitkovsky
        IP Engineer

T:      0333 006 5936
E:      Adam.Vitkovsky at gamma.co.uk
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