MOSPF Prunes
draft-ietf-mospf-prunes-00

Document Type Expired Internet-Draft (mospf WG)
Last updated 1998-12-23
Stream IETF
Intended RFC status (None)
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Stream WG state WG Document
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IESG IESG state Expired
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at
https://www.ietf.org/archive/id/draft-ietf-mospf-prunes-00.txt

Abstract

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.

Authors

John Moy (john.moy@sycamorenet.com)

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)