Configuring RMON with the Web-based Management Interface 95
RMON Threshold Creation fields
Field Description
Alarm Index Type the unique number to identify the alarm entry.
Port Choose the port on which to set an alarm.
Parameter Choose the sampled statistic.
Rising Level Type the event entry to be used when a rising threshold
is crossed.
Falling Level Type the event entry to be used when a falling
threshold is crossed.
Rising Action Choose the type of notification for the event. Selecting
Log generates an entry in the RMON Event Log table
for each event. Selecting SNMP Trap sends an SNMP
trap to one or more management stations.
Interval Type the time period (in seconds) to sample data and
compare the data to the rising and falling thresholds.
Alarm Sample Choose the sampling method:
Absolute: Absolute alarms are defined on the current
value of the alarm variable. An example of an alarm
defined with absolute value is card operating status.
Because this value is not cumulative, but instead
represents states, such as card up (value 1) and card
down (value 2), you set it for absolute value. Therefore,
an alarm could be created with a rising value of 2 and
a falling value of 1 to alert a user to whether the card
is up or down.
Delta: Most alarm variables related to Ethernet traffic
are set to delta value. Delta alarms are defined based
on the difference in the value of the alarm variable
between the start of the polling period and the end of
the polling period. Delta alarms are sampled twice per
polling period. For each sample, the last two values
are added together and compared to the threshold
values. This process increases precision and allows
for the detection of threshold crossings that span the
sampling boundar y. Therefore, if you keep track of
the current values of a given delta-valued alarm and
add them together, the result is twice the actual value.
(This result is not an error in the software.)
3
Click Submit.
—End—
Nortel Ethernet Routing Switch 5500 Series
Configuration - System Monitor ing
NN47200-505 03.01 Standard
5.1 27 August 2007
Copyright © 2005 - 2007, Nortel Networks
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