Distance Vector Multicast Routing Protocol
RFC 1075 describes Version 1 of DVMRP. DVMRP has many versions. The operation of DVMRP
is similar to PIM-DM. The major differences between PIM-DM and DVMRP are defined as
follows:
■ Cisco IOS does not support a full implementation of DVMRP; however, it does support
connectivity to a DVMRP network.
■ DVMRP uses its own distance vector routing protocol that is similar to RIPv2. It sends route
updates every 60 seconds and considers 32 hops as infinity. Use of its own routing protocol
adds more overhead to DVMRP operation compared to PIM-DM.
■ DVMRP uses Probe messages to find neighbors using the All DVMRP Routers group address
224.0.0.4.
■ DVMRP uses a truncated broadcast tree, which is similar to an SPT with some links
pruned.