Reference Guide

Bidirectional Forwarding Detection | 179
Changing OSPF 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 OSPF sessions or all OSPF sessions on a particular interface; if
you change a parameter globally, the change affects all OSPF neighbors sessions. If you change a
parameter at interface level, the change affects all OSPF sessions on that interface.
To change parameters for all OSPF sessions:
To change parameters for OSPF 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 OSPF
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 OSPF neighbors:
To disable BFD sessions with all OSPF neighbors out of an interface:
Step Task Command Syntax Command Mode
1 Change parameters
for OSPF sessions.
bfd all-neighbors interval milliseconds min_rx
milliseconds multiplier value role [active | passive]
ROUTER-OSPF
Step Task Command Syntax Command Mode
1 Change parameters for all
OSPF sessions on an interface.
ip ospf 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 OSPF neighbors. no bfd all-neighbors ROUTER-OSPF
Step Task Command Syntax Command Mode
1 Disable BFD sessions with all OSPF
neighbors out of an interface
ip ospf bfd all-neighbors disable INTERFACE