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OSN 500 550 580 V100R008C50 Alarms and Performance Events Reference 02

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The ETH_APS_PATH_MISMATCH alarm indicates that the working and protection paths at one end are different from the working and protection paths at the other end.


Alarm Severity Alarm Type


Communication alarm



Impact on the System

Service protection fails.

Possible Causes

Possible causes of the ETH_APS_PATH_MISMATCH alarm are as follows:

  • The configured working and protection paths differ between both ends.
  • The physical link is connected incorrectly.


  1. On the U2000, check whether the APS settings at both ends are the same.
  2. If they are different, modify the settings so that they are the same. Then, deactivate and activate the APS protection groups at both ends. Then, check whether the alarm is cleared.
  3. If the alarm persists, go to 4.
  4. Check whether a fiber or cable is correctly connected between both ends. If not, connect the fiber or cable correctly.

Related Information


Updated: 2019-01-21

Document ID: EDOC1100020975

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