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CLI-based Configuration Guide - Interface Management

AR100, AR120, AR160, AR1200, AR2200, AR3200, and AR3600 V300R003

This document provides the basic concepts, configuration procedures, and configuration examples of the interfaces supported by the device.
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Configuring Loopback Detection

Configuring Loopback Detection


  • After the loopback detection is enabled on an interface using the loopback command, the POS interface or link on the interface cannot function properly. When the loopback detection is not required, run the undo loopback command to disable it.

When testing some special functions, for example, diagnosing POS interface faults, enable loopback detection.

Table 14-2 describes the loopback detection classification.

Table 14-2  Loopback detection classification


Hardware loopback

Connect a short-circuiting cable on the transceiver so that the device receives the signals sent by itself.

Software loopback

Remote loopback

Remote loopback means that the local interface sends a packet from the peer interface back to the peer interface, rather than forwarding the packet to the destination address.

Internal loopback

Internal loopback means that a packet from an interface is sent back to this interface inside the system.


  1. Run system-view

    The system view is displayed.

  2. Run interface pos interface-number

    The POS interface view is displayed.

  3. Run loopback { local | remote }

    The loopback detection is enabled for the POS interface and the detection mode is configured.

    By default, loopback detection is disabled on a POS interface.

Updated: 2019-03-06

Document ID: EDOC1100069331

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