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Multicast and Mobility the M-HBH protocol

Multicast and Mobility the M-HBH protocol. Rolland Vida, Serge Fdida LIP6 RHDM 2002, 6-10 mai 2002. The problem. Consider the following: a multicast group, identified by a multicast address G a source S that sends data to G a receiver r that listens to packets sent to G

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Multicast and Mobility the M-HBH protocol

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  1. Multicast and Mobilitythe M-HBH protocol Rolland Vida, Serge Fdida LIP6 RHDM 2002, 6-10 mai 2002

  2. The problem • Consider the following: • a multicast group, identified by a multicast address G • a source S that sends data to G • a receiver r that listens to packets sent to G • How to assure multicast data delivery if … • the source S is mobile or • the receiver r is mobile

  3. Mobile source • Shared Multicast Tree (CBT, PIM-SM) • S sends data in unicast to the core (RP) • data is retransmitted on the shared tree • if S moves in a new network, it still can send unicast packets to the core (RP). Data is delivered to receivers. • Source-based Multicast Tree (DVMRP, PIM-SSM) • the multicast tree is rooted in the home network of S • S moves in a new network, obtains a new address (S’) • several problems must be considered …

  4. Mobile source of a source-based tree • Multicast packets sent by S’ are dropped if … • no multicast router in the visited network • no multicast routing state in the router • In addition, for an SSM service, the mobile source must send data using its Home Address (S) • ingress filtering routers of the visited network drop it • multicast routing protocols that use RPF check drop it

  5. Traditional solutions • Bi-directional tunneling (home subscription) • a tunnel is established between the home and the foreign location of the source • data is tunneled to the home network, and then retransmitted on the old delivery tree • Drawbacks: • triangular routing • encapsulation/decapsulation of data

  6. Example

  7. Example

  8. Example

  9. Example

  10. Traditional solutions (2) • Remote subscription • reconfiguration of the multicast distribution tree according to the new location of the mobile source • the source announces its new location to receivers • receivers join the new source-based tree • Drawbacks: • the entire delivery tree must be reconstructed • reconstruction is costly, not efficient for a highly mobile source

  11. Example

  12. Example

  13. Example

  14. Example

  15. Mobile receiver • Treatment is independent of the multicast routing protocol • The mobile node should … • continue to receive data • continue to send group membership messages

  16. Mobile receiver (2) • traditional solutions can be applied • bi-directional tunneling • tunnel convergence problem • remote subscription • the cost is lower, only a branch of the tree must be reconstructed

  17. The M-HBH protocol • Mobile Hop-By-Hop Multicast Routing Protocol • Extension of the HBH protocol • L. Costa, S. Fdida, and O. Duarte, Hop By Hop Multicast Routing Protocol, in Proceedings of the 2001 ACM SIGCOMM Conference, San Diego, CA, USA, August 2001, pp. 249-259. • Uses a recursive unicast addressing scheme to provide multicast service

  18. Data delivery in HBH

  19. Source Mobility with M-HBH

  20. Source Mobility with M-HBH

  21. Advantages of M-HBH • Eliminates triangular routing • Optimized delivery path • No encapsulation, no tunneling • No tree reconstruction • Transparent handling of mobility • No service interruption • Preserves the advantages of HBH • Passes through unicast-only clouds • Takes into account asymmetric routes, data is forwarded on direct shortest path

  22. Mobile receiver with M-HBH

  23. Mobile receiver with M-HBH

  24. Mobile receiver with M-HBH

  25. Routing triangle

  26. Simulation results

  27. Questions?

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