Network flapping occurs when the physical status of interfaces on a network frequently alternates between Up and Down.
An alarm burr is a process in which alarm generation and alarm clearance signals are received in a short period (The period varies with specific usage scenarios, devices, or service types).
For example, if a loss of signal (LOS) alarm is cleared 50 ms after it is generated, the process from the alarm generation to clearance is an alarm burr.
Alarm flapping is a process in which an alarm is repeatedly generated and cleared in a short period (The period varies with specific usage scenarios, devices, or service types).
For example, if an LOS alarm is generated and cleared 10 times in 1s, alarm flapping occurs.
figure of merit: stability value of an alarm. A larger value indicates a less stable alarm.
penalty: penalty value. Each time an interface receives an alarm generation signal. Each time an interface receives an alarm clearance signal, the figure of merit value decreases exponentially.
suppress: alarm suppression threshold. When the figure of merit value exceeds this threshold, alarms are suppressed. This value must be smaller than the ceiling value and greater than the reuse value.
ceiling: maximum value of figure of merit. When an alarm is repeatedly generated and cleared in a short period, figure of merit significantly increases and, therefore, takes a long time to return to reuse. To avoid long delays returning to reuse, a ceiling value can be set to limit the maximum value of figure of merit. The figure of merit value does not increase when it reaches the ceiling value.
half-time: time used by figure of merit of suppressed alarms to decrease to half.
decay-ok: time used by figure of merit to decrease to half when an alarm clearance signal is received.
decay-ng: time used by figure of merit to decrease to half when an alarm generation signal is received.