Adjusting C-BSR Parameters
At first, each Candidate-BootStrap Router (C-BSR) considers itself as a BootStrap router (BSR) and sends Bootstrap messages to all other routers on the network. You can adjust the C-BSR hash mask length and Candidate-Rendezvous Point (C-RP) priority information carried by a Bootstrap message, interval for sending Bootstrap messages, and the holdtime of Bootstrap messages on a router configured as a C-BSR.
Context
BSR election rules are as follows:
- The C-BSR that has the highest priority wins.
- If C-BSRs have the same priority, the C-BSR that has the highest IP address wins.
Based on the BSR election result, a C-BSR performs one of the following operations:
- If the C-BSR wins the BSR election, it periodically sends Bootstrap messages to routers on the network. The Bootstrap messages carry the IP addresses of the C-BSRs and the RP-Set information.
- If the C-BSR fails in the BSR election, it is suppressed from sending Bootstrap messages.
- When the current BSR becomes faulty, the C-BSRs automatically trigger a new round of BSR election to prevent service interruptions.
Procedure
- Run system-view
The system view is displayed.
- Run pim [ vpn-instance vpn-instance-name ]
The PIM view is displayed.
- Run c-bsr hash-length hash-length
The global hash mask length is set for a C-BSR.
The hash mask length carried in a Bootstrap message is used for RP calculation.
- Run c-bsr priority priority
The global priority is set for a C-BSR.
A larger priority value indicates a higher priority.
- Run c-bsr interval interval
The interval at which a C-BSR sends Bootstrap messages is set.
- Run c-bsr holdtime interval
The period during which the router keeps the Bootstrap message received from a BSR is set.
The period during which the router holds the Bootstrap message received from the BSR must be longer than the interval at which a C-BSR sends Bootstrap messages. Otherwise, BSR election is frequently performed.
The BSR periodically sends a Bootstrap message to the routers on the network. After receiving the Bootstrap message, the routers hold the message for a specified time period. During the period, BSR election is suspended. After this period expires, the C-BSRs trigger a new round of BSR election.
- Run commit
The configuration is committed.