[c-nsp] IOS XR and router rib rump always-replicate

Mark Tinka mark.tinka at seacom.mu
Fri Jul 5 16:17:04 EDT 2013

On Wednesday, March 06, 2013 10:26:38 AM Mikael Abrahamsson 

> How is multicast supposed to work at all whereever for L3
> routing without PIM?

C-multicast signaling would be handled by BGP, instead of 
PIM. This is how (S,G) informations gets propagated in an 
NG-MVPN network.

This ties in with MPLS-based forwarding (instead of IP/GRE), 
where p2mp RSVP-TE or mLDP signals the tunnel down which 
(S,G) will travel.

Because MPLS is used for forwarding Multicast traffic, there 
is no need for PIM or IP/GRE in the core. Of course, you 
still need PIM at the edges (PIM-SM or PIM-SSM where you 
pick the source, and PIM [or more specifically, IGMP] toward 
the receivers).

But the core will be PIM-free. It's very cool, but yes, 
requires an MPLS network, which some people may not like.

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