
Configuring IP Multicasting Services
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• Configuring a Tunnel -- page 4-18
Selecting the Encapsulation Mode -- page 4-18
Specifying the Cost -- page 4-19
Specifying a TTL -- page 4-19
Configuring a Forwarding Table for the Tunnel -- page 4-20
Supplying Addresses for the Tunnel -- page 4-20
DVMRP Concepts and Terminology
DVMRP provides a mechanism for routers to propagate multicast datagrams in a
manner that minimizes the number of excess copies sent to any particular
network.
DVMRP is a dense-mode multicasting protocol.
Neighbor Connections
In a DVMRP environment, neighbors are multicasting routers that are connected
directly or through a tunnel.
• Directly connected neighbors are routers that have an interface to the same
network.
• Tunnel-connected neighbors are multicast routers that communicate through a
unicast network, exchanging DVRMP messages that are encapsulated in IP
datagrams.
In Figure 4-1, for example, multicasting Router A has two neighbors, Router B
and Router C. Router A and Router B are connected directly -- they both have
interfaces to Net 6. Router A and Router C communicate through a tunnel that
includes a unicast router.
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