[c-nsp] BGP Signalled VPLS

Bruce Pinsky bep at whack.org
Tue Apr 23 13:19:15 EDT 2013

Hash: SHA1

Aaron wrote:
> Thanks Caillin/Saku/Adam, this differentiation of VPLS LDP Sig compared to
> BGP Sig as it relates to loop prevention during redundant pe/ce at edge is
> of interest to me...(I actually had a l2 forwarding loop scare me to death
> and had to shut down backside c-to-c during maintenance window a few months
> ago)....i walked away from that with a big question in my head as to how
> does customer spanning tree feed into the loop prevention of split horizon
> groups within a vpls as how pw forwarding treatment occurs...and I thought
> to myself , it probably doesn't... which has had me wondering about this for
> a few months....
> BUT, now y'all mention that bgp signaled vpls as it relates to redundant
> pe/ce avoids this.... correct?  I have adam's link, thanks adam, but does
> anyone have more links related to understanding all that? 
> Adam's implementation link....
> http://www.cisco.com/en/US/docs/routers/asr9000/software/asr9k_r4.3/lxvpn/co
> nfiguration/guide/lesc43pbb.html#wp1183684

By the selection of a Designated Forwarder via the Ethernet AD route
advertisement and the use of a split-horizon label appended to
multi-destination packets.

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