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A customer deployed BFD on its network that comprised a large amount of transmission devices between NE40Es. After the BFD-session status change upon interface status change function is enabled, BFD session frequently occurred on the interface. Services were affected.
Huawei completed the following steps to diagnose the problem:
1. Checked the BFD session flap log BFD/4/STACHG_TODWN on the NE40Es.
According to the Diagnostic parameter, the flap type was DetectDown, meaning that BFD packets were not received as expected (BFD down) during the BFD session detection period.
2. Checked whether BFD configurations were correct on the NE40Es. The configurations were correct, using the default packet sending interval.
3. Suspected that intermediate transmission equipment was faulty.4. Set the BFD-packet sending and detection intervals to larger values. BFD session flapping did not occur.