Alarm Configuration

The top portion of the window contains the device information boxes, as well as the event index number and the event description; the log itself includes the following fields:

Index

This uniquely identifies this occurrence of the event.

Time

Indicates the date and time of each event occurrence.

Description

Provides a detailed description of the alarm that

 

triggered the event: whether it was a rising or falling

 

alarm, the alarm index number, the alarm variable name

 

and object identifier (OID), the alarmSampleType

 

(1=absolute value; 2=delta value), the value that

 

triggered the alarm, the configured threshold that was

 

crossed, and the event description. Use the scroll bar at

 

the bottom of the log to view all the information

 

provided.

Each log will hold only a finite number of entries, which is determined by the resources available on the device; when the log is full, the oldest entries will be replaced by new ones.

How Rising and Falling Thresholds Work

Rising and falling thresholds are intended to be used in pairs, and can be used to provide notification of spikes or drops in a monitored value — either of which can indicate a network problem. To make the best use of this powerful feature, pairs of thresholds should not be set too far apart, or the alarm notification process may be defeated: a built-in hysteresis function designed to limit the generation of events specifies that, once a configured threshold is met or crossed in one direction, no additional events will be generated until the opposite threshold is met or crossed. Therefore, if your threshold pair spans a wide range of values, and network performance is unstable around either threshold, you will only receive one event in response to what may be several dramatic changes in value. To monitor both ends of a wide range of values, set up two pairs of thresholds: one set at the top end of the range, and one at the bottom.

The current version of the Basic Alarms window only allows you to configure a single pair

TIP of thresholds for each alarm variable on each interface; be sure to keep this hysteresis function in mind when configuring those threshold values.

How Rising and Falling Thresholds Work

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Enterasys Networks 700 manual How Rising and Falling Thresholds Work

700 specifications

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