Changing OSPFv3 Session ParametersConfigure BFD sessions with default intervals and a default role.The parameters that you can configure are: desired tx interval, required min rx interval, detection multiplier,and system role. Configure these parameters for all OSPFv3 sessions or all OSPFv3 sessions on a particular interface. If you change aparameter globally, the change affects all OSPFv3 neighbors sessions. If you change a parameter at the interface level, the change affectsall OSPFv3 sessions on that interface.To change parameters for all OSPFv3 sessions or for OSPFv3 sessions on a single interface, use the following commands.To view session parameters, use the show bfd neighbors detail command.• Change parameters for all OSPFv3 sessions.ROUTER-OSPFv3 modebfd all-neighbors interval milliseconds min_rx milliseconds multiplier value role [active |passive]• Change parameters for OSPFv3 sessions on a single interface.INTERFACE modeipv6 ospf bfd all-neighbors interval milliseconds min_rx milliseconds multiplier value role[active | passive]Disabling BFD for OSPFv3If 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 final Admin Down packet is sent before the session is terminated.To disable BFD sessions, use the following commands.• Disable BFD sessions with all OSPFv3 neighbors.ROUTER-OSPFv3 modeno bfd all-neighbors• Disable BFD sessions with OSPFv3 neighbors on a single interface.INTERFACE modeipv6 ospf bfd all-neighbors disableConfigure BFD for IS-ISWhen using BFD with IS-IS, the IS-IS protocol registers with the BFD manager on the RPM. BFD sessions are then established with allneighboring interfaces participating in IS-IS. If a neighboring interface fails, the BFD agent on the line card notifies the BFD manager, whichin turn notifies the IS-IS protocol that a link state change occurred.Configuring BFD for IS-IS is a two-step process:1 Enable BFD globally.2 Establish sessions for all or particular IS-IS neighbors.162 Bidirectional Forwarding Detection (BFD)
