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5-16
Managing the Hub
Writer:
Chris Seiter
Project:
Compaq Netelligent 2724/2824 Dual-Speed Hub User Guide
Comments:
File Name:
2824_5.DOC
Last Saved On:
06/25/97 5:32 PM
b. greater than or equal to the rising threshold, and if the value of
alarmStartupAlarm is risingAlarm(1) or risingOrFallingAlarm(3),
then a rising-alarm event is generated.
c. greater than or equal to the rising threshold, and if the value of
alarmStartupAlarm is fallingAlarm(2), then a rising-alarm event is
generated after having fallen below the rising threshold.
2. After a rising-alarm event is generated, another such event will not be
generated until after the sampled value falls below the rising threshold
and reaches the falling threshold and then subsequently reaches the
rising threshold again.
The conditions for the generation of falling-alarm events are the reverse of
those listed above.
The number of alarmTable entries that may be configured is limited by the
agent’s RAM and NVRAM resources.
Event Group
The Event group controls the generation of event notifications. An event
notification can be an SNMP trap and/or an entry in an event log. In the 2824
hub, the only triggers of events are alarms defined in the Alarm Table. In other
words, an alarm can trigger an event, which can then issue a notification.
The event group is composed of the Event Table (eventTable) and the Log
Table (logTable). Each entry in eventTable specifies a set of notification
parameters. Multiple conditions may trigger a single event notification. The
logTable stores event notifications for those events that create a log entry.
The notification parameters specified by the eventTable entries are saved in
NVRAM and are restored each time the hub is re-initialized. The event log
stored in logTable, however, is not saved.
When an event generates a trap, the community for the trap message is taken
from the associated eventTable entry’s eventCommunity object. The condition
that triggered the event determines the enterprise and specific trap fields.