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Figure 42 Relationship among PIM protocols
PIM support for VPNs
To support PIM for VPNs, a multicast router that runs PIM maintains an independent set of PIM neighbor
table, multicast routing table, BSR information, and RP-set information for each VPN.
After receiving a multicast data packet, the multicast router checks which VPN the data packet belongs
to. Then, the router forwards the packet according to the multicast routing table for that VPN or creates
a multicast routing entry for that VPN.
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 4610, Anycast-RP Using Protocol Independent Multicast (PIM)
• 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)
Configuring PIM-DM
This section describes how to configure PIM-DM.
A receiver joins multicast group G.
G is in the
SSM group range?
BIDIR-PIM runs for G.
BIDIR-PIM is enabled?
G has a BIDIR-PIM RP?
Yes
Yes
Yes
No
PIM-SSM runs for G.
An IGMP-SSM mapping is
configured for G?
PIM-SM runs for G.
A multicast source is
specified?
No
Yes
No
No
No
Yes
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