Reference Guide

182 | Bidirectional Forwarding Detection
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To change parameters for IS-IS sessions on an interface:
View session parameters using the command
show bfd neighbors detail, as shown in the example in
Changing physical port session parameters.
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 (Message 3). Disabling BFD does not trigger a 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:
Configuring BFD for VRRP
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. Refer to Enabling BFD globally.
2. Establish VRRP BFD sessions with all VRRP-participating neighbors.
3. On the master router, establish a VRRP BFD sessions with the backup routers. Refer to Establishing
sessions with all VRRP neighbors.
Step Task Command Syntax Command Mode
1 Change parameters for all IS-IS
sessions out of an interface.
isis bfd all-neighbors interval milliseconds
min_rx milliseconds multiplier value role
[active | passive]
INTERFACE
Step Task Command Syntax Command Mode
1 Disable BFD sessions with all IS-IS
neighbors.
no bfd all-neighbors ROUTER-ISIS
Step Task Command Syntax Command Mode
1 Disable BFD sessions with all IS-IS
neighbors out of an interface
isis bfd all-neighbors disable INTERFACE