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106 Chapter 6 Configur ing RMON using Device Manager
Field Description
FallingThreshold A threshold for the sampled statistic. When the current sampled value is less
than or equal to this threshold, and the value at the last sampling interval was
greater than this threshold, a single event is generated. A single event is
also generated after this entry becomes valid if the first sample is less than
or equal to this threshold and the associated alarmStartupAlarm is equal to
fallingAlarm(2) or risingOrFallingAlarm(3). After a falling event is generated,
another such event is not generated until the sampled value rises above this
threshold and reaches the alarmRisingThreshold.
FallingEventInde
x
The index of the eventEntry used when a falling threshold is crossed. The
eventEntry identified by a particular value of this index is the same as identified
by the same value of the eventIndex object. If there is no corresponding entry
in the eventTable, then no association exists. In particular, if this value is zero,
no associated event is generated, because zero is not a valid event index.
Owner The network management system that created this entry.
Status The status of this alarm entry.
RMON events
RMON events and alarms work together to notify you when values in your
network are outside of a specified range. When values pass the specified
ranges, the alarm is triggered and fires. The event specifies how the activity
is recorded.
How events work
An event specifies whether a trap, a log, or a trap and a log is generated
to view alarm activity. When RMON is globally enabled, two default events
are generated:
•
RisingEvent
•
FallingEvent
The default events specify that when an alarm goes out of range, the firing
of the alarm is tracked in both a trap and a log. For example, when an alarm
fires at the rising threshold, the rising event specifies that this information
be sent to both a trap and a log. Likewise, when an alarm passes the
falling threshold, the falling event specifies that this information be sent to
a trap and a log.
Viewing an event
To view a table of events:
Step Action
1
From the Device Manager main menu, choose Rmon > Alarms.
Nortel Ethernet Switch 460/470
Configuration — System Monitoring
NN47210-503 01.01 Standard
3.7 22 February 2007
Copyright © 2005-2007, Nortel Networks Nortel Networks Confidential
.