Events are sent to the NMS as a series of
clears. A single
clear can clear multiple
raises. Events that relate to each other are
given the same
The correlation ID is a combination of the event class name and the
event component ID. The component ID (available in the MIB) is a combination of
the class name and any substitution strings (arguments) that are passed into
To provide an organized view of events you need to create rules in
your NMS to map events to a state-based object, using the correlation IDs to
associate the events into like groups. When a clear event comes into the NMS
you can cancel all previous raises that have the same correlation ID as the
The raises and clears are defined in the file
which is found in the SNMP folder of your installation.
Some raises have no automatic clears and must be manually cleared.
You should set up an escalation path within your NMS for events that do not
have a corresponding clear.
The ccca-Notifications.txt file contains a list of all alarms and each
alarm contains an ccaEventState (Raise/Clear) and CorrelationID. Based on
CorrelationID, you can determine if a Raise event has a corresponding Clear
event or must be manually cleared.
This information is also available as part of the event;
RAISE=9 requires a manual Clear and
RAISE=4 is an event that has a corresponding Clear.