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DES-3326S Layer 3 Fast Ethernet Switch User’s Guide
Web-Based Switch Management 243
Figure 6-49. DVMRP Interface Configuration − Edit
This menu allows the Distance-Vector Multicast Routing
Protocol to be configured for each IP interface defined on the
switch.
The Distance Vector Multicast Routing Protocol (DVMRP) is a
hop-based method of building multicast delivery trees from
multicast sources to all nodes of a network. Because the
delivery trees are ‘pruned’ and ‘shortest path’, DVMRP is
relatively efficient. Because multicast group membership
information is forwarded by a distance-vector algorithm,
propagation is slow. DVMRP is optimized for high delay (high
latency) relatively low bandwidth networks, and can be
considered as a ‘best-effort’ multicasting protocol.
DVMRP resembles the Routing Information Protocol (RIP), but
is extended for multicast delivery. It relies upon RIP hop counts
to calculate ‘shortest paths’ back to the source of a multicast
message, but defines a ‘route cost’ to calculate which branches
of a multicast delivery tree should be ‘pruned’ – once the
delivery tree is established.