Dell S4820T Configuration Manual page 182

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 18. 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
• Establish sessions with IS-IS neighbors on a single interface.
INTERFACE mode
isis bfd all-neighbors
Example of Verifying Sessions with IS-IS Neighbors
To view the established sessions, use the show bfd neighbors command.
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Bidirectional Forwarding Detection (BFD)