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Configuration Guide - Ethernet Switching

CloudEngine 8800, 7800, 6800, and 5800 V200R003C00

This document describes the configuration of Ethernet services, including configuring MAC address table, link aggregation, VLANs, MUX VLAN, Voice VLAN, VLAN mapping, QinQ, GVRP, VCMP, STP/RSTP/MSTP, VBST, SEP, RRPP, ERPS, LBDT, and Layer 2 protocol transparent transmission.
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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 will return to functioning as an active interface after recovering from a fault. If LACP preemption is disabled, the interface cannot become active interface after it recovers.

The LACP preemption delay is the period that an inactive interface waits before changing to the active interface. The LACP preemption delay reduces the chances of unstable data transmission on an Eth-Trunk 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, the longer preemption delay becomes effective.

  5. Run commit

    The configuration is committed.

Updated: 2019-05-08

Document ID: EDOC1100004351

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