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OSN 500 550 580 V100R008C50 Alarms and Performance Events Reference 02

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EX_ETHOAM_CC_LOS

EX_ETHOAM_CC_LOS

Description

The EX_ETHOAM_CC_LOS is an alarm indicating the loss of the periodic connectivity check (CC) packets. After receiving the CC packets from the source maintenance point, the sink maintenance point starts the timer and then periodically checks the link between the source and sink maintenance points. If the sink maintenance point does not receive the CC packets from the source maintenance point in one period (3.5 times of the duration in which the CC packets are transmitted from the source maintenance point to the sink maintenance point), this alarm is reported.

Attribute

Alarm Severity Alarm Type

Critical

Communication alarm

Parameters

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

Indicates the ID of maintenance point(MEP) where the EX_ETHOAM_CC_LOS alarm is reported. The MEP ID should be unique in the entire network.

Parameter 2

Indicates the number of the Ethernet port where the EX_ETHOAM_CC_LOS alarm is reported.
  • 0x03-0xff: types for expansion. MAC port number: 0x0001-0x0000 + MAX_ETH_PORT.

  • VCTRUNK port number: 0x8001-0x8000 + MAX_ETH_VCTRUNK.
NOTE:
  • The MAX_ETH_PORT indicates the maximum MAC port number supported by the board.

  • The MAX_ETH_VCTRUNK indicates the maximum VCTRUNK port number supported by the board.

Parameter 3

Indicates the service VLAN ID.
  • For a service with the VLAN tag, the VLAN ID ranges from 0x0000 to 0x0FFF.

  • For a service without the VLAN tag, the VLAN ID is 0xffFF.

Parameter 4

Indicates the maintenance domain level.
  • 0x00: Consumer MEP level (high).

  • 0x01: Consumer MEP level (middle).
  • 0x02: Consumer MEP level (low).
  • 0x03: Provider MEP level (high).
  • 0x04: Provider MEP level (low).
  • 0x05: Operator MEP level (high).
  • 0x03: Provider MEP level (high).
  • 0x06: Operator MEP level (middle).
  • 0x07: Operator MEP level (low).
NOTE:

Consumer indicates the customer, provider the supplier and operator the carrier.

Parameter 5

Indicates the ID of the MEP at the CC source. The MEP ID should be unique in the entire network.

Parameter 6

Indicates the ID of the MEP at the CC sink. The MEP ID should be unique in the entire network.

NOTE:

The ID of the MEP at the CC sink is the ID of the MEP where the EX_ETHOAM_CC_LOS alarm is reported. Parameter 1 and Parameter 6 carry the same information.

Impact on the System

This alarm reminds you that a unidirectional connectivity failure has been detected in the link from the source maintenance point to the sink maintenance point.

Possible Causes

The possible causes of the alarm are as follows:

  • A software or hardware failure occurs on the services from the source maintenance point to the sink maintenance point.

  • A congestion or an interruption occurs on the services from the source maintenance point to the sink maintenance point.

Procedure

  1. View the alarm on the NMS. According to the parameters, determine the ID of the MEP where the alarm occurs.
  2. Query the information about the MEP.
  3. Perform the loopback (LB) or link trace (LT) on the source and sink MEPs to locate the fault on the services between the source and sink MEPs.
  4. Check the faulty services (check the software, hardware, and traffic) and then restore the services. When the services are restored, the alarm is automatically cleared.

Related Information

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Updated: 2019-01-21

Document ID: EDOC1100020975

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