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184 | Bidirectional Forwarding Detection
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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 Figure 9-8 on
page 179.
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 on page 179). 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