154 | Bidirectional Forwarding Detection (BFD)
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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:
Configuring BFD for IS-IS
BFD for IS-IS is supported on platforms: e z
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. See Enabling BFD globally.
2. Establish sessions for all or particular IS-IS neighbors.
Related configuration tasks
• Change session parameters.
• Disable BFD sessions for IS-IS.
Establishing sessions with IS-IS neighbors
BFD sessions can be established for all IS-IS neighbors at once or sessions can be established for all
neighbors out of a specific 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
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