Configuring the Association Between BFD Status and Sub-Interface Status

Perform the following procedure on the ME60/NE40E-X3  that needs to rapidly detect the link fault:

Run:

system-view

The system view is displayed.

Run:

bfd cfg-name

The BFD session view is displayed.

Run:

process-interface-status sub-if

The association between the BFD status and the sub-interface status is configured.

Run:

commit

The configuration is committed.

NOTE:

When the process-interface-status command and the commit command are run in succession, the BFD session may not be set up or the BFD session does not go Up through negotiation. Therefore, the BFD session does not notify the interface of the BFD status immediately, avoiding that the BFD session notifies the interface of incorrect status information that results in incorrect interface status change. After the configuration is committed, the BFD sessions can notify the interface of the BFD status change. In this manner, the BFD session status is associated with the interface status.

If the networking requires that the BFD status must be synchronized with the interface status, you can run the shutdown and undo shudown commands to change the status of the BFD session. When the undo shutdown command is run, a timer to test the BFD session status is started. If the BFD session goes Up through negotiation before the timer expires, the BFD session notifies the interface of the Up state. Otherwise, the BFD session regards the link as failed and notifies the interface of the Down state after the timer expires. In this manner, the BFD session status and the interface status are in real-time synchronization.

If the process-interface-status command is saved in the configuration file, the BFD session that is bound to the interface notifies the interface that the BFD session is Down when the NE80E/40E is restarted, in view of the initial status of an interface being Down.

Before BFD status is associated with interface status, the BFD configurations on the two NE80E/40Es must be correct and symmetrical. If the BFD status on the local interface goes Down, check whether the BFD configuration on the peer is correct or whether the BFD session has been shut down.