peer bfd (BGP view) (group)

Format

peer group-name bfd { min-tx-interval min-tx-interval | min-rx-interval min-rx-interval | detect-multiplier multiplier } ^*

undo peer group-name bfd { min-tx-interval | min-rx-interval | detect-multiplier } ^*

Parameters

Parameter	Description	Value
group-name	Specifies the name of a peer group.	The name is a string of 1 to 47 case-sensitive characters, with spaces not supported. When double quotation marks are used around the string, spaces are allowed in the string.
min-tx-interval min-tx-interval	Specifies the interval at which BFD packets are sent.	The value is an integer ranging from 3 to 20000, in milliseconds. The default value is 10.
min-rx-interval min-rx-interval	Specifies the interval at which BFD packets are received.	The value is an integer ranging from 3 to 20000, in milliseconds. The default value is 10.
detect-multiplier multiplier	Specifies the local detection time multiplier.	The value is an integer ranging from 3 to 50. The default value is 3.

Views

BGP view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
bgp	write

Usage Guidelines

Usage Scenario

BFD provides millisecond-level fault detection. It helps BGP to detect faults in neighboring devices or links more quickly, and instructs BGP to recalculate routes for correct packet forwarding. The peer bfd command can be used to set the values of BFD session parameters on a specified interface.

The BFD configuration of a peer takes precedence over that of the peer group to which the peer belongs. If BFD is not configured on a peer and the peer group to which the peer belongs is enabled with BFD, the peer will inherit the BFD configurations of the peer group.

Prerequisites

A BFD session can be established only when the corresponding BGP session is in the Established state.

Configuration Impact

If the peer bfd command is run multiple times, the latest configuration overwrites the previous one. The BFD session uses the latest parameters as the detection parameters.

Assume that BFD is configured on a peer group. If the peer bfd block command is not run on members of the peer group, the members will establish BFD sessions.

Precautions

If BFD parameters are set on a peer, a BFD session will be established by using the BFD parameters on the peer.

Example

# Configure BFD and set detection parameters on peer 192.168.1.1.

<HUAWEI> system-view
[~HUAWEI] bgp 100
[*HUAWEI-bgp] group test external
[*HUAWEI-bgp] peer test as-number 200
[*HUAWEI-bgp] peer test bfd min-tx-interval 100 min-rx-interval 100 detect-multiplier 5