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OSN 500 550 580 V100R008C50 Alarms and Performance Events Reference 02

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The MPLS_TUNNEL_UNEXPMEP is an alarm indicating an error of the tunnel OAM CCM information. The sink NE reports this alarm upon receiving an OAM packet (containing CCM information) with an unexpected MEP ID.

  1. The ingress NE adds a tunnel outgoing label to the OAM packet that contains the CCM information and sends the packet to the egress NE. CCM information includes the MEG level, MEG ID, and MEP ID of the ingress NE.
  2. The egress NE receives the OAM packet based on its incoming label and compares the CCM information in the packet with that configured on itself. If MEG levels and MEG IDs are consistent but MEP IDs are inconsistent, the egress NE reports the MPLS_TUNNEL_UNEXPMEP alarm.


Alarm Severity Alarm Type


Communication 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

(OptiX OSN 500/550)LSRID/MEGID: Indicates the source of the packet.

OptiX OSN 580 has no alarm parameters.

Impact on the System

When this alarm occurs, services are interrupted.

Possible Causes

The possible cause of the MPLS_TUNNEL_UNEXPMEP alarm is as follows:

Cause: MEP IDs are inconsistent on NEs at both ends of the tunnel.

As shown in Figure 4-24, NE2 is the source end for NE1 and the MEP ID on both NEs is 1.

However, the MEP ID of NE1 is set to 1 while that of NE2 is set to 2 in fact. Therefore, NE2 reports the MPLS_TUNNEL_UNEXPMEP alarm upon receiving the OAM packet (containing CCM information) with an incorrect MEP ID from NE1.

Figure 4-24  MPLS_TUNNEL_UNEXPMEP alarm detection


  1. As shown in Figure 4-24, check whether tunnel configurations are consistent on the source and sink NEs. MEP IDs must be set to the same value on NEs at both ends of a tunnel.


    The MEP IDs must be consistent on the source and sink NEs of a tunnel.

  2. If MEP IDs are inconsistent, change them to the same.
  3. Check whether the alarm is cleared. If the alarm persists, contact Huawei technical support engineers for a solution.

Related Information


Updated: 2019-01-21

Document ID: EDOC1100020975

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