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NE40E V800R010C10SPC500 Configuration Guide - IP Multicast 01

This is NE40E V800R010C10SPC500 Configuration Guide - IP Multicast
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Adjusting C-BSR Parameters

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.


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.


  1. Run system-view

    The system view is displayed.

  2. Run pim [ vpn-instance vpn-instance-name ]

    The PIM view is displayed.

  3. 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.

  4. Run c-bsr priority priority

    The global priority is set for a C-BSR.

    A larger priority value indicates a higher priority.

  5. Run c-bsr interval interval

    The interval at which a C-BSR sends Bootstrap messages is set.

  6. 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.

  7. Run commit

    The configuration is committed.

Updated: 2019-01-03

Document ID: EDOC1100055017

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