On Wednesday, March 06, 2013 10:26:38 AM Mikael Abrahamsson wrote: > 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. Mark.
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