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At the outset of this chapter, it is important to clarify the
distinction between a routing
protocol and a routed
protocol. OSPF, for example, is a routing protocol. Routing
protocols are used to determine a path to the destination for a
routed protocol. Routed protocols include IP, IPX, AppleTalk and
DECNet. Routed protocols carry their data inside of specific
packets. If we are using OSPF, then we are routing IP packets, which
do not travel inside of OSPF packets; they travel inside of IP
packets. The same argument can be made for IP multicast data, which
travels inside of IP packets. The packet does not care how it gets
routed to the destination as long as it gets there. It makes no
difference if the network is running DVMRP, PIM-DM, or PIM-SM.
Therefore, if a mechanism exists so that PIM and DVMRP can exchange
routes, then MBONE packets can be delivered to non-DVMRP
networks. |
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