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OSN 500 550 580 V100R008C50 Alarms and Performance Events Reference 02

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LAG_MEMBER_DOWN

LAG_MEMBER_DOWN

Description

The LAG_MEMBER_DOWN alarm indicates that a member port of a link aggregation group (LAG) cannot be activated and cannot work as a backup port.

Attribute

Alarm Severity Alarm Type

Minor

Equipment 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 board ID.

Parameter 2

Indicates the sub-board ID.

Parameter 3, Parameter 4

Indicates the port ID.

Parameter 5

Indicates the cause that makes the port unavailable.

  • 0x01: The port is disabled or in link-down state.
  • 0x02: The port receives no LACP packets.
  • 0x03: The port works in half-duplex mode.
  • 0x04: The port is looped back.

Impact on the System

The impact on the system varies depending on the load sharing mode.

  • In load-sharing mode, packet loss may occur and persist due to bandwidth insufficiency.
  • In non-load-sharing mode, link switching is triggered and packet loss occurs temporarily.

Possible Causes

Possible causes of the ETH_LINK_DOWN alarm are as follows:

  • The port is unavailable.
  • The port receives no LACP packets.
  • The port works in half-duplex mode.
  • The port is looped back.

Procedure

  1. On the U2000, query Parameter 5 of the reported alarm.

    • If the value of Parameter 5 is 0x01, go to 2.
    • If the value of Parameter 5 is 0x02, go to 3.
    • If the value of Parameter 5 is 0x04, go to 5.

  2. On the U2000, check whether the ETH_LOS alarm is reported on the port that reports the LAG_MEMBER_DOWN alarm. If yes, clear the ETH_LOS alarm.
  3. On the U2000, check whether the ETH_LOS or FLOW_OVER alarm is reported on the port that reports the LAG_MEMBER_DOWN alarm. If yes, clear the ETH_LOS or FLOW_OVER alarm.
  4. On the U2000, check whether the port works in half-duplex mode. If yes, change the working mode of the port into full-duplex.
  5. Check whether the port at the local end reports the LOOP_ALM alarm. If yes, delete the loopback setting.

Related Information

None.

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Updated: 2019-01-21

Document ID: EDOC1100020975

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