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Configuration Guide - Ethernet Switching

S1720, S2700, S5700, and S6720 V200R012(C00 and C20)

This document describes the configuration of Ethernet services, including configuring MAC address table, link aggregation, VLANs, VLAN aggregation, MUX VLAN, VLAN termination, 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 the Working Mode of an Eth-Trunk in an E-Trunk

(Optional) Configuring the Working Mode of an Eth-Trunk in an E-Trunk


You can only configure the working mode for Eth-Trunks that have been added to an E-Trunk. The working mode of an Eth-Trunk can be automatic, forced master, or forced backup.


  1. Run system-view

    The system view is displayed.

  2. Run interface eth-trunk trunk-id

    The Eth-Trunk interface view is displayed.

    Only Eth-Trunks in LACP mode can be added to an E-Trunk.

  3. Run e-trunk mode { auto | force-master | force-backup }

    A working mode of the Eth-Trunk in the E-Trunk is configured.

    By default, an Eth-Trunk in an E-Trunk works in automatic mode.

    The e-trunk mode command is valid only for the Eth-Trunk in an E-Trunk. When the Eth-Trunk is deleted from the E-Trunk, the configuration is deleted automatically.

    When an Eth-Trunk works in automatic mode, its master/backup status is controlled by the E-Trunk status of the local device and fault information of the remote Eth-Trunk.
    • If the local E-Trunk is the master, the local Eth-Trunk works in master state.

    • If the local E-Trunk is the backup and the remote member Eth-Trunk fails, the local Eth-Trunk works in master state. When the local Eth-Trunk receives a notification that the remote Eth-Trunk has recovered, the local Eth-Trunk becomes the backup.


    When E-Trunk is working normally, changing the hello packet sending interval or timeout interval may cause flapping of the E-Trunk between master and backup. Before changing the hello packet sending interval or timeout interval, you are advised to configure member Eth-Trunks to work in forcible master/backup state. After the new configuration takes effect, restore the working mode to automatic.

Updated: 2018-12-24

Document ID: EDOC1100038339

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