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OSN 500 550 580 V100R008C50 Alarms and Performance Events Reference 02

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The MPLS_PW_AIS is an alarm indicating that a defect is detected on a PW. The MIP NE sends AIS packets to the downstream NE when it detects a fault on a tunnel carrying PW. The sink MEP NE reports this alarm upon receiving the AIS packet.


Alarm Severity Alarm Type


Communication alarm



Impact on the System

When this alarm occurs, services are interrupted.

Possible Causes

The possible cause of the MPLS_PW_AIS alarm is as follows:

The MIP NE detects a fault on a tunnel carrying the PW.

Figure 4-7 shows the process of MPLS_PW_AIS alarm detection.

Figure 4-7  MPLS_PW_AIS alarm detection


  1. Check whether the MPLS tunnel OAM are correctly configured for source and sink MEP NEs and MIP NEs. If the MPLS tunnel OAM is configured incorrectly, modify MPLS tunnel OAM configurations by referring to section Configuring MPLS OAM in Configuration Guide (Packet Transport Domain). Then, check whether the alarm is cleared.
  2. If the alarm is uncleared, query whether there are tunnel-related alarms on MEP NEs, such as MPLS_TUNNEL_AIS. If yes, clear them immediately. Then, check whether the MPLS_PW_AIS alarm is cleared.
  3. If the alarm persists, contact Huawei technical support engineers to handle the alarm.

Related Information


Updated: 2019-01-21

Document ID: EDOC1100020975

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