Track 2 - Internet Routing and IP Network management (7-Oct-96)

Multicast

3) Protocols

A) IGMP protocol

  1. Query/Reponse for Group membership and response

  2. Query format [group addres = 0]
    1. Host member of any groups? [to 224.0.0.1 from routers]
    2. (use TTL of 1 to provide scope)
    3. look for response
  3. Response

    1. format - 1 per group

    2. all routers need to listen to response to

      routers don't flood group

    3. if response within time period - don't send another

  4. Join source -specific group

  5. Leave source -specific group

  6. Rendezvous-point ID for PIM