Introduction of Transmission Alarm Customization and Suppression


Carrier-class networks require high reliability for IP devices. IP devices are required to rapidly detect faults.

When the fast detection function is enabled on an interface, alarm reporting becomes faster. This may cause the physical status of the interface to switch between Up and Down. As a result, the network flaps frequently. Therefore, alarms must be filtered and suppressed to prevent frequent network flapping.

Transmission alarm suppression can efficiently filter and suppress alarm signals to prevent interfaces from frequently flapping. In addition, transmission alarm customization can control the impact of alarms on the interface status.

Transmission alarm customization and suppression provide the following functions:

  • The Transmission alarm customization function allows you to specify alarms that can cause the physical status of an interface to change. This function helps filter out unwanted alarms.

  • The Transmission alarm suppression function allows you to suppress network flapping by setting a series of thresholds.


Transmission alarm customization allows you to filter unwanted alarms, and transmission alarm suppression enables you to set thresholds on customized alarms, allowing devices to ignore burrs generated during transmission link protection and preventing frequent network flapping.

On a backbone network or an MAN, IP devices are connected to transmission devices, including synchronous digital hierarchy (SDH), Synchronous Optical Network (SONET). When transmission devices become faulty, IP devices will receive alarms. Then, faulty transmission devices perform link switchovers and the alarms disappear. After an alarm is generated, a link switchover lasts 50 ms to 200 ms. In the log information on IP devices, the transmission alarms are displayed as burrs that last 50 ms to 200 ms. These burrs will cause the interface status of IP devices to switch frequently. IP devices will perform route calculation frequently. As a result, routes flap frequently, affecting the performance of IP devices.

From the perspective of the entire network, IP devices are expected to ignore such burrs. That is, IP devices must customize and suppress the alarms that are generated during transmission device maintenance or link switchovers. This can prevent route flapping. Transmission alarm customization can control the impact of transmission alarms on the physical status of interfaces. Transmission alarm suppression can efficiently filter and suppress specific alarm signals to avoid frequent interface flapping.

Copyright © Huawei Technologies Co., Ltd.
Copyright © Huawei Technologies Co., Ltd.
Next topic >