GATE (Graduate Aptitude Test in Engineering) Computer Science & IT (CS) Computer Networks-Routing Algorithms Study Material (Page 9 of 11)

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Multicast, Multicast Routing, PIM: Protocol Independent Multicast, PIM - Dense Mode (PIM-DM) , PIM - Sparse Mode (PIM-SM)

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Multicast Routing

Multicast Routing
  • Multicast routing is all about finding a common path to reach all the destinations that belong to the group.
  • While unicast routing focuses on finding the least-cost path between source and destination, multicast routing is about finding a tree (or trees) connecting routers having local multicast group members.
  • The same tree may be shared by all group members or we could have a specific tree for each source.
  • The DVMRP protocol we discussed in the previous module, uses the latter approach.
  • The PIM protocol which we are no…

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Inter-Domain Multicast

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  • The multicast protocols that we have discussed so far are intra-domain protocols.
  • If we have group members spread out across domains, then we need inter-domain multicast.
  • We will now look at a couple of ideas used for inter-domain multicast.
  • One idea is to extend and build on top of the PIM protocol across domains, the other is to extend BGP to support multicasting.
  • The former uses a protocol called Multicast…

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