c-bsr interval (IPv4)

Function

The c-bsr interval command configures the interval for the BSR to continuously send Bootstrap messages.

The undo c-bsr interval command restores the default configuration.

By default, the interval for the BSR to continuously send Bootstrap messages is 60s.

Format

c-bsr interval interval

undo c-bsr interval

Parameters

Parameter	Description	Value
interval	Specifies the interval for the BSR to continuously send the Bootstrap messages.	The value is an integer that ranges from 1 to 107374177, in seconds.

Views

PIM view of public network instance or PIM view of VPN instance

Default Level

2: Configuration level

Usage Guidelines

Usage Scenario

After a C-BSR is elected as the BSR, it periodically sends Bootstrap messages carrying its own IP address and the RP-set information to the network.

Other C-BSRs that fail in the election are suppressed from sending Bootstrap messages and start the timer to monitor the BSR. The timeout period of a timer is holdtime, which can be configured using the c-bsr holdtime command. The following applies to the timer:

If the C-BSR receives the Bootstrap messages sent by the BSR, the C-BSR refreshes the timer.
If the timer times out, the BSR is considered to be faulty. The C-BSRs that failed in the election triggers a new BSR election, preventing service interruption.

Prerequisites

IP multicast routing has been enabled using the multicast routing-enable command.

Precautions

In actual applications, all C-BSRs in the same PIM domain must use the same BS_interval and holdtime values; otherwise, the BSR will become unstable. This may result in a multicast fault. Note the following points:

If BS_interval and holdtime are configured at the same time, ensure that BS_interval is less than holdtime.
If only one of the BS_interval and holdtime is configured, use the following formula to calculate the other parameter: holdtime = 2 x BS_interval + 10. The following determines which value is used:
- If holdtime is configured and the calculated BS_interval is less than the minimum value of BS_interval, the minimum value is used.
- If BS_interval is configured and the calculated holdtime is more than the maximum value of holdtime, the maximum value is used.
If neither the BS_interval nor the holdtime is configured, default values are used. The default value of BS_interval is 60s, and the default value of holdtime is 130s.

Example

# In the PIM view of public network instance, set the interval for the C-BSR to continuously send Bootstrap messages to 30 seconds.

<HUAWEI> system-view
[HUAWEI] multicast routing-enable
[HUAWEI] pim
[HUAWEI-pim] c-bsr interval 30