MOSPF


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AcronymDefinition
MOSPFMulticast Ospf
MOSPFMulticast Open Shortest Path First
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MOSPF routers use the Internet Group Membership protocol (IGMP) to establish the location of group members, by sending IGMP Host Membership Queries and receiving IGMP Host Membership Reports in return.
The MOSPF routing calculation is then performed in an "on-demand" fashion.
The MOSPF routing calculation is very similar to OSPF's unicast routing calculation, both using the Dijkstra algorithm to calculate shortest-path trees.
While forwarding the multicast datagram along its pruned, source-based shortest-path tree, MOSPF routers make use of link-level multicast services, when they exist.
The distribution of MOSPF's group-membership-LSAs works as follows.
As of the writing of this article there is only one released MOSPF implementation (developed by Proteon, Inc.), although several others are in development.
The multicast applications included with the Proteon MOSPF implementation are: a multicast pinger (a common IP diagnostic tool), interactive commands so the router itself can join and leave multicast groups (and so respond to multicast pings), and the ability to send network management alerts to an IP multicast address.
Unlike MOSPF's link state technology base, DVMRP is based on the distance-vector technology that forms the basis for such routing protocols as IP's Routing Information Protocol (RIP;).
Toward this goal, the Proteon MOSPF implementation also includes a DVMRP implementation and the "glue logic" allowing routing information to be passed between the two multicast routing protocols.
Not only does this enable more of the Internet's routers to route multicasts without tunneling, it also allows Autonomous Systems running MOSPF to become part of the MBone.
MOSPF's link state technology converges faster and is less prone to looping during the convergence time than DVMRP, which suffers some of the same problems that the Internet's RIP protocol does when faced with topological changes in a redundant topology.
* Using MOSPF in parts of the Internet allows aggregation of sources before they are advertised into DVMRP, keeping the size of the worldwide DVMRP tables smaller.