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Log Reference

AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 V200R007

This document supports all the logs of device, including the parameters, meaning, possible causes and solution.

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PPP/4/LOOPBACK:On the interface [interface-name], PPP link was closed because loopback was detected after PPP link had been established.


The PPP link was closed because a loop was detected after a link was established.


Parameter Name Parameter Meaning
[interface-name] Indicates the local interface name.

Possible Causes

After a PPP link was established, a loop was detected on the link.


  1. Check whether loopback detection is configured on the interface. If loopback detection has been disabled and the link loop persists, go to step 2.
  2. Check whether a physical loop exists on the PPP link. Remove the lines between the local device and the remote device. If the interface goes Down, no loop exists on the local device. If the interface is in Up status, contact technical support personnel.
Updated: 2019-05-29

Document ID: EDOC1000097209

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