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S12700 V200R010C00 Configuration Guide - Ethernet Switching

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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Enabling Automatic LBDT

Enabling Automatic LBDT

Context

The switch joins VLAN 1 by default, and the PVID of all interfaces is VLAN 1. When an interface changes from Down to Up, a loop may occur. You can configure automatic LBDT to detect loops in the VLAN specified by the PVID on an interface.

Procedure

  1. Run:

    system-view

    The system view is displayed.

  2. Run:

    undo loopback-detect auto disable

    Automatic LBDT is enabled on all interfaces.

    By default, automatic LBDT is enabled on all interfaces. When a loop is detected in the VLAN specified by the PVID on an interface, a trap is reported.

    NOTE:
    • To disable automatic LBDT, run the loopback-detect auto disable command.

    • When the loopback-detect enable command is used to configure manual LBDT, automatic LBDT becomes invalid.

    • When the loopback-detect enable command is used to configure manual LBDT, automatic LBDT on the corresponding interface becomes invalid.

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Updated: 2019-08-21

Document ID: EDOC1000142081

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