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194 CHAPTER 6: MULTICAST PROTOCOL
Figure 9 RPT Schematic Diagram
Multicast Source Registration
When multicast source S sends a multicast packet to group G, the PIM-SM
multicast router is responsible for encapsulating the packet into a registration
packet upon receipt. It then sends the packet to the corresponding RP in unicast. If
there are multiple PIM-SM multicast routers on a network segment, the
Designated Router (DR) will be responsible for sending the multicast packet.
Preparing to Configure
PIM-SM
Tasks for preparing to Configure PIM-SM are described in the following sections:
■ Configure Candidate RPs
■ Configure BSRs
■ Configure Static RP
Configure Candidate RPs
In a PIM-SM network, multiple RPs (candidate-RPs) can be configured. Each
Candidate-RP (C-RP) is responsible for forwarding multicast packets with the
destination addresses in a certain range. Configuring multiple C-RPs is to
implement load balancing of the RP. These C-RPs are equal. All multicast routers
Multicast Source S
RPT
join
Multicast source registration
RP
Receiver
RPT
join
Multicast source
registration
Multicast source S
RP
Receiver