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Configuration Guide - Reliability

CloudEngine 8800, 7800, 6800, and 5800 V200R003C00

This document describes the configurations of Reliability, including BFD Configuration, VRRP Configuration, DLDP Configuration, Smart Link and Monitor Link Configuration, EFM Configuration, and CFM Configuration.
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CFM Alarms

CFM Alarms

If CFM detects a fault in an end-to-end link, it triggers an alarm and sends the alarm to the network management system (NMS) so that a network administrator can take measures to rectify the fault.

Alarm Anti-jitter

Multiple alarms and clear alarms may be generated on an unstable network enabled with CC. These alarms consume system resources and affect system performance. The RMEP activation time can be set to prevent incorrect alarms, and the alarm anti-jitter time can be set to limit the number of alarms generated.

Table 7-5 Alarm anti-jitter



RMEP activation time

The RMEP activation time can be used to prevent incorrect alarms. The local MEP that is enabled to receive CCMs starts to receive CCMs only after the RMEP activation time is reached. If the local MEP does not receive CCMs in 3.5 consecutive intervals for sending CCMs, the local device considers that a connectivity fault occurs between the local MEP and the RMEP. Then the local device generates an RMEP connectivity fault alarm.

Alarm anti-jitter time

If a MEP detects a connectivity fault:
  • It sends an alarm to the NMS after the anti-jitter time is reached.

  • It does not send an alarm if the fault is rectified before the anti-jitter time is reached.

Clear alarm anti-jitter time

If a MEP detects a connectivity fault and sends an alarm:
  • It sends a clear alarm if the fault is rectified within the clear alarm anti-jitter time.

  • It does not send a clear alarm if the fault is not rectified within the clear alarm anti-jitter time.

Alarm Suppression

If different types of faults trigger more than one alarm, the CFM alarm suppression function allows the device to report the alarm with the highest level to the NMS. If low-level alarms still exist after the highest-level alarm is cleared, the alarm with the secondary highest level is sent to the NMS. The process repeats until all alarms are cleared.

The principles of CFM alarm suppression are as follows:
  • High-level alarms correspond to major issues on networks and need to be solved preferentially.

  • A single fault may trigger alarms with different levels. After the highest-level alarm is cleared, low-level alarms that are caused by the same fault corresponding to the highest-level alarm may also be cleared.

Updated: 2019-05-08

Document ID: EDOC1100004359

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