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Configuring PIM-SM 197
Perform the following configuration in system view.
Using undo pim command, you can clear the configuration in PIM view and back
to system view.
Configuring Candidate-BSRs
In a PIM domain, one or more candidate BSRs should be configured. A BSR
(Bootstrap Router) is elected among candidate BSRs. The BSR takes charge of
collecting and advertising RP information.
The automatic election among candidate BSRs is described as follows. One
interface which has started PIM-SM, must be specified when configuring the
router as the candidate BSR. At first, each candidate BSR considers itself as the BSR
of the PIM-SM domain, and sends a Bootstrap message by taking the IP address of
the interface as the BSR address. When receiving Bootstrap messages from other
routers, the candidate BSR will compare the BSR address of the newly received
Bootstrap message with that of itself. Comparison standards include priority and
IP address. The bigger IP address is considered better when the priority is the same.
If the new BSR address is better, the candidate BSR will replace its BSR address.
Otherwise, the candidate BSR will keep its BSR address and continue to regard
itself as the BSR.
Perform the following configuration in PIM view.
Candidate-BSRs should be configured on the routers in the network backbone. By
default, no BSR is set. The default priority is 0.
Only one router can be configured with one candidate-BSR. When a
candidate-BSR is configured on another interface, it will replace the previous
configuration.
Configuring Candidate-RPs
In PIM-SM, the shared tree built by the multicast routing data is rooted at the RP.
There is mapping from a multicast group to an RP. A multicast group can be
mapped to an RP. Different groups can be mapped to one RP.
Table 35 Entering PIM View
Operation Command
Enter PIM view pim
Back to system view undo pim
Table 36 Configuring Candidate-BSRs
Operation Command
Configure a candidate-BSR c-bsr interface-type interface-number
hash-mask-len [ priority ]
Remove the candidate-BSR configured undo c-bsr