156 | Bidirectional Forwarding Detection (BFD)
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Changing IS-IS session parameters
BFD sessions are configured with default intervals and a default role. The parameters that can be
configured are: Desired TX Interval, Required Min RX Interval, Detection Multiplier, and system role.
These parameters are configured for all IS-IS sessions or all IS-IS sessions out of an interface; if you
change a parameter globally, the change affects all IS-IS neighbors sessions. If you change a parameter at
interface level, the change affects all IS-IS sessions on that interface.
To change parameters for all IS-IS sessions:
To change parameters for IS-IS sessions on an interface:
View session parameters using the command
show bfd neighbors detail.
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:
Step Task Command Syntax Command Mode
1 Change parameters for all IS-IS
sessions.
bfd all-neighbors interval milliseconds
min_rx milliseconds multiplier value role
[active | passive]
ROUTER-ISIS
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
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