The peer bfd command sets BFD detection parameters for a peer group.
The undo peer bfd command restores default BFD detection parameter values.
By default, the interval at which BFD packets are sent is 10 milliseconds, the interval at which BFD packets are received is 10 milliseconds, the local detection time multiplier is 3.
| 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. |
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.
<HUAWEI> system-view [~HUAWEI] ip vpn-instance vpna [*HUAWEI-vpn-instance-vpna] ipv4-family [*HUAWEI-vpn-instance-vpna-af-ipv4] route-distinguisher 100:1 [*HUAWEI-vpn-instance-vpna-af-ipv4] vpn-target 111:1 both [*HUAWEI-vpn-instance-vpna-af-ipv4] quit [*HUAWEI-instance-vpna] quit [~HUAWEI] bgp 100 instance a [*HUAWEI-bgp-instance-a] ipv4-family vpn-instance vpna [*HUAWEI-bgp-instance-a-vpna] group test external [*HUAWEI-bgp-instance-a-vpna] peer test bfd min-tx-interval 100 min-rx-interval 100 detect-multiplier 5