DELL S50V User Manual

Bidirectional Forwarding Detection | 195

Disabling BFD for IS-IS

If BFD is disabled globally, all sessions are torn down, and sessions on the remote system are placed in a 
Down state. If BFD is disabled on an interface, sessions on the interface are torn down, and sessions on the 
remote system are placed in a Down state (

change in BFD clients; a final Admin Down packet is sent before the session is terminated.

To disable BFD sessions with all IS-IS neighbors:

To disable BFD sessions with all IS-IS neighbors out of an interface:

When using BFD with VRRP, the VRRP protocol registers with the BFD manager on the RPM. BFD 
sessions are established with all neighboring interfaces participating in VRRP. If a neighboring interface 
fails, the BFD agent on the line card notifies the BFD manager, which in turn notifies the VRRP protocol 
that a link state change occurred.

Configuring BFD for VRRP is a three-step process:

1. Enable BFD globally. See 

2. Establish VRRP BFD sessions with all VRRP-participating neighbors.

3. On the master router, establish a VRRP BFD sessions with the backup routers. See page 195.

Related configuration tasks

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Establishing sessions with all VRRP neighbors

BFD sessions can be established for all VRRP neighbors at once, or a session can be established with a 
particular neighbor.

1

Disable BFD sessions with all IS-IS 
neighbors.

ROUTER-ISIS

1

Disable BFD sessions with all IS-IS 
neighbors out of an interface

INTERFACE