peer bfd enable
Function
The peer bfd enable command enables BFD for peers or a peer group.
The undo peer bfd enable command disables BFD for peers or a peer group.
By default, BFD is disabled for peers or a peer group.
Only the S5720-EI, S5720-HI, S5730-HI, S5731-H, S5731-S, S5731S-H, S5731S-S, S5732-H, S6720-EI, S6720-HI, S6720S-EI, S6730-H, S6730S-H, S6730-S, and S6730S-S support this command.
Format
peer { group-name | ipv4-address | ipv6-address } bfd enable [ single-hop-prefer ]
undo peer { group-name | ipv4-address | ipv6-address } bfd enable
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. |
| ipv4-address | Specifies the IPv4 address of a peer. | It is in dotted decimal notation. |
| ipv6-address | Specifies the IPv6 address of a peer. | The value is a 32-digit hexadecimal number, in the format of X:X:X:X:X:X:X:X. |
| single-hop-prefer | Indicates that single-hop BFD sessions are preferentially established. single-hop-prefer takes effect only on IBGP peers. By default, single-hop-prefer is not specified, and multi-hop sessions are established between direct IBGP peers (Huawei devices). To interconnect a Huawei device and a non-Huawei device that defaults the sessions between IBGP peers to single-hop, configure single-hop-prefer in the command. |
- |
Views
BGP view, BGP-VPN instance IPv4 address family view, BGP-VPN instance IPv6 address family view
Usage Guidelines
Usage Scenario
BGP uses BFD to quickly detect faults in links between BGP4 peers. This accelerates network convergence. The peer bfd enable command is used to configure a device to establish a BFD session with its peer or peer group by using default detection parameter values.
Prerequisites
Peer relationships have been established using the peer as-number command.
A BFD session can be established only when the corresponding BGP peer relationship is in the Established state.
Precautions
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 inherits the BFD configurations from the peer group.
Before enabling BFD on a BGP peer, enable BFD in the system view. If no BFD detection parameter is specified, a BFD session is established by using default parameter values.
The peer bfd block command and the peer bfd enable command are mutually exclusive.