H3C Technologies H3C S12500 Series Switches - Manual (Page 140)

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Figure 49 Relationship among PIM protocols
PIM support for VPNs
CAUTION:
When the system is operating in standard mode, a reserved VLAN must be configured if you want to
configure PIM support for VPNs. Otherwise, abnormality might occur in the system. After a reserved
VLAN is configured, any change to it will incur reconfiguration of the reserved VLAN. For information
about the system operating mode, see Fundamentals Configuration Guide. For information about how to
configure a reserved VLAN, see MPLS Configuration Guide and MPLS Command Reference.
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 to which VPN the data packet belongs,
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)
• 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)
A receiver joins multicast group G
G is in the SSM group range
Use BIDIR-PIM for G
BIDIR-PIM is used?
G has corresponding
BIDIR-PIM RP?
Yes
No
Yes
No
Yes
No
Use PIM-SSM for G
An IGMP SSM mapping is
configured for G?
Use PIM-SM for G
The receiver specifies a
multicast source?
No
Yes
No
Yes