In this scenario, all the devices in the network that sense the network outage will start sending messages (alarms) to the Fault Management component in the Element Management System (EMS). This condition typically will last for a few minutes and whenever it happens, the EMS can get saturated with thousands of alarms in a short period of time.
Some EMS products cannot handle large alarm storms, which can result in sluggish performance in fault management, or in the entire element/Network Management System.
A state of the art EMS can handle such network outages and at the same time be capable of processing all of the alarms without dropping any of them. This is typically accomplished by using one or more of the following techniques.
Incorporating an EMS framework for alarm reception that will ensure that all the alarms are received.
Implementing an efficient event/alarm queue to buffer the alarms received and ensure that the queue is managed effectively
Using a capable "rule engine", which can be configured with rules such as "If the same alarm occurs "M" times in "N" minutes then consider it as a single alarm and do not notify the administrator".
By making the rule engine flexible and intelligent the EMS can be provided with the ability to handle alarm storms with minimal impact on the responsiveness of the fault management component of the EMS, while preserving system resources to also handle topology management, performance management, configuration management and security functions.
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