3Com 10014299 By default, the interface disables PIM-SM protocol, Enable/Disable PIM-SM Protocol

PIM-SM Configuration 517

Table 588 Enable/Disable PIM-SM Protocol

Operation	Command
Enable PIM-SM protocol	pim sm
Disable PIM-SM protocol	undo pim sm

By default, the interface disables PIM-SM protocol.

Note that PIM-SM only runs on specific interfaces. One interface can only run one multicast routing protocol at one time.

Configuring the In a PIM-SM domain, there must be a unique bootstrap router to enable PIM-SM Candidate BSR router to function normally. BSR takes charge of collecting and sending RP

information. Several candidate bootstrap routers (C-BSR) generate one publicly acknowledged BSR by bootstrap message selection. Before the BSR information is known, C-BSRs view themselves as BSRs. They periodically broadcast bootstrap messages in PIM-SM domain (the broadcast address is 224.0.0.13). Such a message contains BSR address and priority.

BSR manages RP, and it collects and distributes the RP information in the whole network. RP is generated from the BSR election.

Make the following configuration in the system view.

Table 589 Configure Candidate BSR

Operation	Command
Configure an interface to be candidate	c-bsrinterface-type
BSR	interface-number hash-mask-length [
	priority ]
Disable an interface from being candidate	undo c-bsr
BSR

By default, no interface is configured to be a candidate BSR.

Use the pim command in system view to enter PIM view.

Configuring the In the PIM-SM protocol, the shared tree (RP Path Tree) constructed by the routing Candidate RP multicast data regards the rendezvous point (RP) as its root, and the group

members as its leaves. RP is generated from BSR selection. After the BSR is selected, all the C-RPs periodically unicast to BSR C-RP advertisements. BSR then selects the RP, and propagates it to the whole network. There may be several RPs, and each has different group service range. In this way, all the routers can get RP information.

In configuring candidate RP, we can specify the RP group service range. It can serve all the multicast groups, or just part of the groups.

Make the following configuration in the system view.

Table 590 Configure Candidate RP

Operation Command