H3C S5500-EI - Relationships Among PIM Protocols; PIM Support for Vpns; Protocols and Standards

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• If the group address in the message does not fall into the SSM group range, the receiver-side DR
follows the PIM-SM process. The receiver-side DR sends a (*, G) join message to the RP, and the
source-side DR registers the multicast source.
Relationships among PIM protocols
In a PIM network, PIM-DM cannot run together with PIM-SM, BIDIR-PIM, or PIM-SSM. However, PIM-SM,
BIDIR-PIM, and PIM-SSM can run together. When they run together, which one is chosen for a receiver
trying to join a group depends, as shown in Figure 52.
Figure 52 Relationships
among PIM protocols
For more information about IGMP SSM mapping, see "Configuring IGMP (available only on the
S5500-EI)."
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, and then 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)