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OSN 500 550 580 V100R008C50 Alarms and Performance Events Reference 02

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The PORTMODE_MISMATCH alarm indicates that the working mode of the opposite FE port does not match with that of the local FE port. When the local FE port is in the auto-negotiation mode and the opposite FE port is in the non-auto-negotiation mode, the PORTMODE_MISMATCH alarm is reported.


Alarm Severity Alarm Type


Service 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

Indicate the working mode of the local FE port.

Parameter 1 is always 0x00.

Parameter 2 indicate the working mode of the local port.

0x01: 10M half duplex.

0x03: 100M half duplex.

0x05: 1000M half duplex.

Impact on the System

Service packets are lost on the link and the network rate decreases.

Possible Causes

The possible cause of the PORTMODE_MISMATCH alarm is as follows:

  • The working mode of the local FE port is inconsistent with that of opposite FE port. For example, the local FE port works in the auto-negotiation mode whereas the opposite FE port works in the non-auto-negotiation mode.


  1. View the PORTMODE_MISMATCH alarm on the U2000, and then confirm the number of the MAC port where the PORTMODE_MISMATCH alarm is generated according to alarm parameters.
  2. Disable and then enable the opposite FE port, and start the auto-negotiation mode. Ensure that the working mode of the local FE port is consistent with that of the opposite FE port. Check whether the PORTMODE_MISMATCH alarm is cleared.

Related Information


Updated: 2019-01-21

Document ID: EDOC1100020975

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