Configure Bfd For Is-Is - Dell S4048T Configuration Manual

sessions. If you change a parameter at the interface level, the change affects 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.
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 final 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

Configure BFD for IS-IS

When using BFD with IS-IS, the IS-IS protocol registers with the BFD manager on the RPM. BFD sessions are
then established with all neighboring interfaces participating in IS-IS. If a neighboring interface fails, the BFD
agent on the line card notifies the BFD manager, which in 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.
Bidirectional Forwarding Detection (BFD) 192