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PIM-SM Configuration 517
Table 588 Enable/Disable PIM-SM Protocol
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
Candidate BSR
In a PIM-SM domain, there must be a unique bootstrap router to enable PIM-SM
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
By default, no interface is configured to be a candidate BSR.
Use the pim command in system view to enter PIM view.
Configuring the
Candidate RP
In the PIM-SM protocol, the shared tree (RP Path Tree) constructed by the routing
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
Enable PIM-SM protocol pim sm
Disable PIM-SM protocol undo pim sm
Operation Command
Configure an interface to be candidate
BSR
c-bsr interface-type
interface-number hash-mask-length [
priority ]
Disable an interface from being candidate
BSR
undo c-bsr
Operation Command