147
To do... Use the command... Remarks
Enable auto-RP auto-rp enable
Required
Disabled by default
Configuring C-RP timers globally
To enable the BSR to distribute the RP-set information within the BIDIR-PIM domain, C-RPs must
periodically send C-RP-Adv messages to the BSR. The BSR learns the RP-set information from the received
messages, and encapsulates its own IP address together with the RP-set information in its bootstrap
messages. The BSR then floods the bootstrap messages to all PIM routers in the network.
Each C-RP encapsulates a timeout value in its C-RP-Adv messages. Upon receiving a C_RP-Adv message,
the BSR obtains this timeout value and starts a C-RP timeout timer. If the BSR fails to hear a subsequent C-
RP-Adv message from the C-RP within the timeout interval, the BSR assumes the C-RP to have expired or
become unreachable.
The C-RP timers need to be configured on C-RP routers.
Follow these steps to configure C-RP timers globally:
To do... Use the command... Remarks
Enter system view system-view —
Enter public network PIM view
or VPN instance PIM view
pim [ vpn-instance vpn-instance-name
]
—
Configure the C-RP-Adv interval c-rp advertisement-interval interval
Optional
60 seconds by default
Configure C-RP timeout time c-rp holdtime interval
Optional
150 seconds by default
NOTE:
For more information about the configuration of other timers in BIDIR-PIM, see “Configuring PIM
common tim
ers.”
Configuring a BSR
A BIDIR-PIM domain can have only one BSR, but must have at least one C-BSR. You can configure any
router as a C-BSR. Elected from C-BSRs, the BSR collects and advertises RP information in the BIDIR-PIM
domain.
Configuring a C-BSR
C-BSRs must be configured on routers in the backbone network. When configuring a router as a C-BSR,
be sure to specify a BIDIR-PIM-enabled interface on the router. The following summarizes the BSR
election process:
• Initially, every C-BSR assumes itself to be the BSR of the BIDIR-PIM domain, and uses its interface IP
address as the BSR address to send bootstrap messages.
• When a C-BSR receives the bootstrap message of another C-BSR, it first compares its own priority
with the other C-BSR’s priority carried in message. The C-BSR with a higher priority wins. If a tie
occurs in the priority, the C-BSR with a higher IP address wins. The loser uses the winner’s BSR
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