To prevent STP flapping caused by device restart and peer-link faults and ensure switching performance, you are advised to set the delay in reporting the Up event to be at least 30s on the M-LAG interface, peer-link interface, and other service interfaces. By default, the delay for an M-LAG interface to report the Up state is 120s in V200R005C00 and earlier versions, and 240s in V200R005C10 and later versions.