(Optional) Configuring BFD for a Specified Interface

Procedure

1. Run system-view

   The system view is displayed.

2. Run interface interface-type interface-number

   The interface view is displayed.

3. (Optional) On an Ethernet interface, run undo portswitch

   The interface is switched to Layer 3 mode.

   By default, an Ethernet interface works in Layer 2 mode.

   

   Only the S5720-EI, S5720-HI, S5730-HI, S5731-H, S5731-S, S5731S-H, S5731S-S, S5732-H, S6720-EI, S6720-HI, S6720S-EI, S6730-H, S6730S-H, S6730-S, and S6730S-S support switching between Layer 2 and Layer 3 modes.

4. Run ospfv3 bfd enable

   BFD is enabled on the interface to establish a BFD session.

   When BFD is configured globally and the neighbor status is Full, OSPFv3 establishes BFD sessions on all the neighbors in the process using default BFD parameters.

   You can run the ospfv3 bfd { min-transmit-interval min-transmit-value | min-receive-interval min-receive-value | detect-multiplier detect-multiplier-value }^* [ instance instance-id ] } command to set parameters for BFD sessions.

   Using the default min-transmit-value, min-receive-value, and detect-multiplier values is recommended. Therefore, the ospfv3 bfd { min-transmit-interval min-transmit-value | min-receive-interval min-receive-value | detect-multiplier detect-multiplier-value }^* [ instance instance-id ] } command can be skipped.

   The parameters are configured based on the network status and network reliability requirements. A short interval at which BFD packets are transmitted can be configured for a link that has a higher requirement for reliability. A long interval at which BFD packets are transmitted can be configured for a link that has a lower requirement for reliability.

   

   • The BFD configured on an interface takes precedence over that configured in a process. Specifically, if BFD is enabled on an interface, BFD parameters on the interface are used to establish BFD sessions.

   • If the parameters of a BFD session are set but the ospfv3 bfd enable command is not run, BFD cannot be enabled.