Protocol Independent Multicast-Source Specific Multicast Guidelines - Avaya 8800 Planning And Engineering

If the shortest path from C to the source is through switch B, and the interface between C and B
does not have PIM-SM enabled, then C cannot switch to the SPT. C discards data that comes
through the shared path tree (that is, through A). The simple workaround is to enable PIM on
VLAN1 between C and B.
Figure 83: PIM network with non-PIM interfaces
Protocol Independent Multicast-Source Specific Multicast
guidelines
PIM Source Specific Multicast (SSM) is a one-to-many model that uses a subset of the PIM-
SM features. In this model, members of an SSM group can only receive multicast traffic from
a single source, which is more efficient and puts less load on multicast routing devices.
IGMPv3 supports PIM-SSM by enabling a host to selectively request or filter traffic from
individual sources within a multicast group.
Planning and Engineering — Network Design

Protocol Independent Multicast-Source Specific Multicast guidelines

November 2010 189