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OSN 500 550 580 V100R008C50 Alarms and Performance Events Reference 02

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ERPS_IN_PROTECTION indicates that EPRS ring is in protection mode.


Alarm Severity Alarm Type


Equipment alarm


When you view an alarm on the network management system, select the alarm. In the Alarm Details field display the related parameters of the alarm. The alarm parameters are in the following format: Alarm Parameters (hex): parameter1 parameter2...parameterN. For details about each parameter, refer to the following table.

Name Meaning

Parameter 1, Parameter 2


Parameter 3

DIR, indicating whether the faulty node is in the east or west direction of the ERPS RPL-OWNER node.
  • 0x00: west
  • 0x01: east

Parameter 4, Parameter 5, Parameter 6, Parameter 7, Parameter 8, Parameter 9

NODE ID, indicating the MAC address of the faulty node.

Impact on the System

At least one node on the ring is unreachable. Services (if any) on this node may be interrupted.

Possible Causes

Possible causes of the ERPS_IN_PROTECTION alarm are as follows:

  • Cause 1: This alarm is reported when EPRS switching is triggered by a fault on the ERPS ring.


  1. Locate the faulty node on the ERPS ring based on the alarm parameters.
  2. Locate the ERPS blocked port on the faulty node.
  3. Rectify the fault.

Related Information


Updated: 2019-01-21

Document ID: EDOC1100020975

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