No relevant resource is found in the selected language.

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies. Read our privacy policy>Search

Reminder

To have a better experience, please upgrade your IE browser.

upgrade

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.
Rate and give feedback:
Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
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. When the switch is enabled with MAC address flapping detection, if MAC address flapping is detected in a VLAN, automatic LBDT is triggered to detect loops in the VLAN.

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.

Follow-up Procedure

To enable LBDT triggered by MAC address flapping, first configure MAC address flapping detection. For details on how to configure MAC address flapping detection, see Configuring MAC Address Flapping Detection.

By default, global MAC address flapping detection is enabled. The switch detects MAC address flapping in all VLANs.

When automatic LBDT is triggered to automatically detect loops in the VLAN where MAC address flapping is detected, you can configure either of the following actions on the interface:
  • trap: The interface only sends a trap.
  • quitvlan: The interface is removed from the VLAN where a loop occurs.

You can run the loopback-detect auto action { quitvlan | trap } command in the system view to configure the action when automatic LBDT is triggered to automatically detect loops in the VLAN where MAC address flapping is detected.

By default, the action is trap when automatic LBDT is triggered to detect loops in the VLAN where MAC address flapping is detected.

NOTE:

The quitvlan action that is configured using this command takes effect only in the scenario where automatic LBDT is triggered to detect a loop between interfaces in the VLAN where MAC address flapping is detected. The trap action is used in the scenario where automatic LBDT is triggered to detect a loop on the downstream network or device in the VLAN where MAC address flapping is detected.

Translation
Download
Updated: 2018-12-24

Document ID: EDOC1100038339

Views: 167299

Downloads: 699

Average rating:
This Document Applies to these Products
Related Version
Related Documents
Share
Previous Next