8.2 Future Work
8.2.3 Routing Security in Core Network
A multicast routing protocol creates a multicast distribution tree that effectively routes packets from the sender(s) to the receivers who are connected to the tree at its edges. Here multicast routers in several domains must maintain state information that allows a router to rout multicast packets pertaining to a group to the correct outgoing interfaces, to downstream multicast routers, and finally to the receivers.
In order for a unicast or a multicast routing protocol to behave correctly, all the control packets exchanged among the routers implementing the protocol must be protected against malicious modifications and deletions, and insertions o f bogus control packets. This is true for both unicast and multicast routers, since routing tables in routers are often shared between the unicast protocols and the multicast protocols, and the actual shape o f the multicast distribution tree is determined to a large extent by the unicast routing table.
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