|Document||Type||Expired Internet-Draft (mospf WG)|
|Intended RFC status||(None)|
Expired & archivedpdf htmlized (tools) htmlized bibtex
|Stream||WG state||WG Document|
|Document shepherd||No shepherd assigned|
|Send notices to||(None)|
MOSPF is a link-state multicast routing protocol, based on OSPF. Inside a single OSPF area, the delivery of multicast datagrams is restricted to group members only, by propagating the location of group members through group-membership-LSAs. However, group membership is not propagated across area and/or AS boundaries, relying instead on so-called wild-card multicast receivers. This means that in some cases multicast datagrams are transmitted further than necessary, wasting link and processor resources in the process. This document defines a way to prune these excess branches off the MOSPF delivery tree, using a new Prune-LSA. In concept these are similar to the prunes employed by the DVMRP protocol. However, to reuse the reliability mechanisms present in the base OSPF protocol, MOSPF prunes are implemented as local-scope Opaque-LSAs. As a result, inter-area and inter-AS multicast datagrams are forwarded by MOSPF using the broadcast-and-prune strategy employed by DVMRP.
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