Reference Guide

Configure BFD for IS-IS
When using BFD with IS-IS, the IS-IS protocol registers with the BFD manager. BFD sessions are then established with all
neighboring interfaces participating in IS-IS. If a neighboring interface fails, the BFD agent on the line card notifies the BFD
manager, which in turn notifies the IS-IS protocol that a link state change occurred.
Configuring BFD for IS-IS is a two-step process:
1. Enable BFD globally.
2. Establish sessions for all or particular IS-IS neighbors.
Related Configuration Tasks
● Changing IS-IS Session Parameters
● Disabling BFD for IS-IS
Establishing Sessions with IS-IS Neighbors
BFD sessions can be established for all IS-IS neighbors at once or sessions can be established for all neighbors out of a specific
interface.
Figure 13. Establishing Sessions with IS-IS Neighbors
To establish BFD with all IS-IS neighbors or with IS-IS neighbors on a single interface, use the following commands.
● Establish sessions with all IS-IS neighbors.
ROUTER-ISIS mode
bfd all-neighbors
Bidirectional Forwarding Detection (BFD)
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