H1
wants to receive from S = 1.1.1.1 but not from S = 2.2.2.2
With
IGMPv3, specific sources can be pruned back - S =
2.2.2.2 in this case
RFC3376
Enables hosts to listen only
to a specified subset of the hosts sending to the group
Video Server
Video Server
IGMPv3 Example
(future)
In this example,
host H1 has joined group 224.1.1.1 but only wishes to receive traffic from
Source 1.1.1.1.Using an as yet
unspecified IGMPv3 mechanism, the host can inform the designated router,
R3, that it is only interested in multicast traffic from Source 1.1.1.1 for
Group 224.1.1.1.Router R3 could
then potentially prune this specific (S,G) traffic source.