DELL S50V User Manual

Bidirectional Forwarding Detection | 187

Disabling BFD for BGP 

To disable a BFD for BGP session with a specified neighbor, enter the 

 {

 | 

} 

 command in 

ROUTER BGP configuration mode

.

To remove the disabled state of a BFD for BGP session with a specified neighbor, enter the 

 

{

 | 

} 

 command in 

ROUTER BGP 

configuration mode. The BGP link 

with the neighbor returns to normal operation and uses the BFD session parameters globally configured 
with the 

command or configured for the peer group to which the neighbor belongs.

Using BFD in a BGP Peer Group

If you establish a BFD session for the members of a peer group (

command 

in ROUTER BGP configuration mode), members of the peer group may have BFD:

•

Explicitly enabled (

 

command)

•

Explicitly disabled (

 

command) 

•

Inherited (neither explicitly enabled or disabled) according to the current BFD configuration of the 
peer group. For information on BGP peer groups, see 

. 

If you explicitly enable (or disable) a BGP neighbor for BFD that belongs to a peer group:

•

The neighbor does not inherit the BFD enable/disable values configured with the 

command or configured for the peer group to which the neighbor belongs.

5

Configure parameters for a BFD session 
established with all neighbors discovered by 
BGP.

OR

Establish a BFD session with a specified BGP 
neighbor or peer group using the default BFD 
session parameters. 

bfd all-neighbors [interval millisecs

 

min_rx millisecs multiplier value role 
{active | passive}]

OR

 {

 | 

}

CONFIG-ROUTER-
BGP

Notes: 
- When you establish a BFD session with a specified BGP neighbor or peer group using the neighbor bfd 
command, the default BFD session parameters are used (interval: 100 milliseconds, min_rx: 100 milliseconds, 
multiplier: 3 packets, and role: active).
- When you explicitly enable or disable a BGP neighbor for a BFD session with the 

 

or 

 

commands:

  - The neighbor does not inherit the BFD enable/disable values configured with the 

command 

or configured for the peer group to which the neighbor belongs.
  - The neighbor only inherits the global timer values configured with the 

command (interval, 

min_rx, and multiplier).

6

Repeat Steps 1 to 5 on each BGP peer participating in a BFD session.