Flapping is a flood
of consecutive event notifications related to the same alarm. It can occur when
a fault causes repeated event notifications (for example, a cable with a
loosely fitting connector.) An event is identified as a flapping event if
multiple events are of the same type, are associated with the same source, and
recur in a short period of time.
Cisco EPN Manager
will generate an alarm for flapping events. This alarm is generated when there
are five occurrences of the same event within 300 seconds. The five occurrences
could be of a sequence such as, Interface Down, Interface Up, Interface Down,
Interface Up, Interface Down, and so on.
When an alarm is
generated for a flapping event, the devices often go into a continuous
synchronization state. This can prevent deployment of device configuration such
as service provisioning, OAM, etc, on the device. However, in
Cisco EPN Manager, when a monitored device raises a
Cisco EPN Manager detects this alarm and stops further
updates of the alarm until the flapping condition on the device is cleared.
The alarm detected as
a Flapping Event is cleared based on an exit condition, which is that when
there is no occurrence of the same event within the next 300 seconds, the alarm
is cleared. This helps control the flow of events to avoid unnecessary
triggering of device synchronization.