3com 3.01.01 用户手册

calculate the RPs corresponding to multicast groups according to the same 
algorithm, after receiving the C-RP messages that the BSR advertises.

The BSR is the management core in a PIM-SM network. Candidate-RPs send 
announcement to the BSR, which is responsible for collecting and advertising the 
information about all candidate-RPs.

It should be noted that there can be only one BSR in a network but you can 
configure multiple candidate-BSRs. In this case, once a BSR fails, you can switch 
over to another BSR. A BSR is elected among the C-BSRs automatically. The C-BSR 
with the highest priority is elected as the BSR. If the priority is the same, the C-BSR 
with the largest IP address is elected as the BSR.

The router that serves as the RP is the core router of multicast routes. If the 
dynamic RP elected by BSR mechanism is invalid for some reason, the static RP can 
be configured to specify RP. As the backup of dynamic RP, static RP improves 
network robustness and enhances the operation and management capability of 
multicast network.

Basic PIM-SM configuration includes:

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Advanced PIM-SM configuration includes:

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