What is DVMRP?

DVMRP is the Distance Vector Multicast Routing Protocol; it is the routing protocol implemented by the mrouted program. An earlier version of DVMRP is specified in RFC-1075. However, the version implemented in mrouted is quite a bit different from what is specified in that RFC (different packet format, different tunnel format, additional packet types, and more). It maintains topological knowledge via a distance-vector routing protocol (like RIP, described in RFC-1058), upon which it implements a multicast forwarding algorithm called Truncated Reverse Path Broadcasting. DVMRP suffers from the well-known scaling problems of any distance-vector routing protocol.

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