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Configuration Guide - Ethernet Switching

S7700 and S9700 V200R011C10

This document describes the configuration of Ethernet services, including configuring link aggregation, VLANs, Voice VLAN, VLAN mapping, QinQ, GVRP, MAC table, STP/RSTP/MSTP, SEP, and so on.
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(Optional) Configuring LACP Preemption

(Optional) Configuring LACP Preemption


The LACP preemption function ensures that the interface with the highest LACP priority always functions as an active interface. For example, the interface with the highest priority becomes inactive due to a failure. If LACP preemption is enabled, the interface becomes active again after it recovers; if LACP preemption is disabled, the interface cannot become active interface after it recovers.

The LACP preemption delay is the period during which an inactive interface switches to active. The LACP preemption delay prevents unstable data transmission on an Eth-Trunk link due to frequent status changes of some links.


  1. Run system-view

    The system view is displayed.

  2. Run interface eth-trunk trunk-id

    The Eth-Trunk interface view is displayed.

  3. Run lacp preempt enable

    LACP preemption is enabled.

    By default, LACP preemption is disabled. To ensure normal running of an Eth-Trunk, enable or disable LACP preemption at both ends of the Eth-Trunk.

  4. Run lacp preempt delay delay-time

    The LACP preemption delay is set.

    By default, the LACP preemption delay is 30 seconds. If both devices of an Eth-Trunk use different preemption delays, a longer preemption delay is used.

Updated: 2019-10-18

Document ID: EDOC1000178310

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