OpenView Network Node Manager: Designing and Implementing an Enterprise Solution

Reducing Event Storms with ECS

NNM 6.0 introduced event correlation services (ECS) to provide the means to intelligently interpret the event stream, reduce its volume, and increase its quality. This solves the problem of servicing events on a large network which can number hundreds per minute. A single outage can generate thousands of events. As it’s impractical to react to them all, network managers would resort to one of the following:

• ignore all messages except when a critical device goes down

• reconfigure most messages “log only”

• handle critical alarms only

• use the NNM event browser filter to limit events

• buy a third-party tool for event filtering

The NNM event browser filter lets you configure the following criteria to limit events displayed: ...