When interfaces used to track BFD sessions are configured on an S9300, and the WTR time is set, why does BFD flapping occur sometimes

S9300 switches have LE0MFSUA installed on the MPU. In V100R002, when a BFD session becomes Up, the blocked port is unblocked. When the WTR time is set and the BFD session state changes from Down to Up, BFD sends a notification to the upper-layer application only after the WTR time expires. In this case, the port's blocking state is canceled until the WTR timer times out. The blocked port, however, cannot send packets, causing the BFD session to become Down again. BFD flapping occurs. This problem is solved in V100R003 and later versions.

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