Users Guide
Changing OSPF Session Parameters
Congure BFD sessions with default intervals and a default role.
The parameters that you can congure are: desired tx interval, required min rx interval, detection multiplier,
and system role. Congure these parameters for all OSPF sessions or all OSPF sessions on a particular interface. If you change a
parameter globally, the change aects all OSPF neighbors sessions. If you change a parameter at the interface level, the change aects all
OSPF sessions on that interface.
To change parameters for all OSPF sessions or for OSPF sessions on a single interface, use the following commands.
• Change parameters for OSPF sessions.
ROUTER-OSPF mode
bfd all-neighbors interval milliseconds min_rx milliseconds multiplier value role [active |
passive]
• Change parameters for all OSPF sessions on an interface.
INTERFACE mode
ip ospf bfd all-neighbors interval milliseconds min_rx milliseconds multiplier value role
[active | passive]
To view session parameters, use the show bfd neighbors detail command, as shown in the example in Displaying BFD for BGP
Information.
Disabling BFD for OSPF
If you disable BFD globally, all sessions are torn down and sessions on the remote system are placed in a Down state.
If you disable BFD on an interface, sessions on the interface are torn down and sessions on the remote system are placed in a Down state.
Disabling BFD does not trigger a change in BFD clients; a nal Admin Down packet is sent before the session is terminated.
To disable BFD sessions, use the following commands.
• Disable BFD sessions with all OSPF neighbors.
ROUTER-OSPF mode
no bfd all-neighbors
• Disable BFD sessions with all OSPF neighbors on an interface.
INTERFACE mode
ip ospf bfd all-neighbors disable
Congure BFD for OSPFv3
BFD for OSPFv3 provides support for IPV6.
Conguring BFD for OSPFv3 is a two-step process:
1 Enable BFD globally.
2 Establish sessions with OSPFv3 neighbors.
NOTE
: BFD for OSPFv3 with ECMP is not supported.
154 Bidirectional Forwarding Detection (BFD)