127
Figure 48 Selection of PIM-SM, BIDIR-PIM, and PIM-SSM
A receiver joins multicast group G.
G is in the
SSM group range?
Enable BIDIR-PIM for G
BIDIR-PIM is enabled?
G has corresponding
BIDIR-PIM RP?
Yes
No
Yes
No
Yes
No
Enable PIM-SSM for G
IGMP SSM mapping is
configured for G?
Enable PIM-SM for G
The receiver specifies a
multicast source?
No
Yes
No
Yes
NOTE:
For more information about IGMP SSM mapping, see the chapter “IGMP configuration.”
Multi-instance PIM
A multicast router that is running multiple instances maintains an independent set of PIM neighbor table,
multicast routing table, BSR information, and RP-set information for each instance.
Upon receiving a multicast data packet, the multicast router determines the VPN instance that the data
packet belongs to. The router then forwards the packet according to the multicast routing table of that
VPN instance or creates a multicast routing table entry for that VPN instance.
Protocols and standards
• RFC 3973, Protocol Independent Multicast-Dense Mode (PIM-DM): Protocol Specification(Revised)
• RFC 4601, Protocol Independent Multicast-Sparse Mode (PIM-SM): Protocol Specification (Revised)
• RFC 5015, Bidirectional Protocol Independent Multicast (BIDIR-PIM)
• RFC 5059, Bootstrap Router (BSR) Mechanism for Protocol Independent Multicast (PIM)
• RFC 4607, Source-Specific Multicast for IP
• Draft-ietf-ssm-overview-05, An Overview of Source-Specific Multicast (SSM)
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