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What Is the Function of the Delay for LACP Preemption?
When an Eth-Trunk interface in LACP mode goes Up and Down frequently due to unstable physical links, LACP goes Up and Down accordingly. As a result, services transmitted on the Eth-Trunk link are affected. After the LACP preemption delay is set, LACP negotiation is not performed during the delay period. The possibility of LACP flapping is reduced, and services will not be affected.
You can run the lacp preempt enable command to enable the LACP preemption function on the current Eth-Trunk interface and run the lacp preempt delay delay-time command to configure the preemption delay.