Cabletron Systems EMM-E6 manual Configuring Alarms, Alarm Configuration, Traffic, Collisions, Errors

Alarm Configuration

Configuring Alarms

While configuring alarms for your EMM-E6 you must set the threshold and timebase that will factor in triggering the alarm. From the repeater alarms window you set an alarm timebase that applies to all enabled alarms at the repeater, module and port level; this timebase is the interval (in seconds) over which the selected variable(s) will be counted for comparison to the threshold values. The thresholds are configured separately for each alarm type and at each alarm level (repeater, module, and port). For example, if the Broadcasts alarm is enabled, the repeater-level threshold is set at 1000, and the timebase is set to 10 seconds, the EMM-E6 will generate an alarm if 1000 broadcast packets are processed within a 10-second time period; if the module-level threshold is set to 100, the EMM-E6 will also generate an alarm if 100 broadcast packets are processed by that module within the 10-second time period.

NOTE

Since alarm condition samples are taken at the end of the defined timebase interval, alarm conditions which occur over the span of two timebase intervals will not be detected even if the threshold is crossed within the defined timebase. For example, if the timebase is set to 10 seconds and the broadcast alarm threshold is set to 20, 20 or more broadcast packets may be detected in the last 5 seconds of one time interval and the first five seconds of the subsequent interval (for a total time interval of 10 seconds), but no alarm will be triggered because the broadcasts occurred within two different timebase intervals. The shorter the timebase, the more likely this condition is to occur.

You can set alarm thresholds for the following variables:

Traffic

The traffic threshold determines the total number of packets that can be processed by the repeater, module, or port within the user-defined timebase before an alarm is triggered. Allowable values are 1 to ≈ 4 billion.

Collisions

The collisions threshold sets the number of collisions per good packet that will be allowed on the repeater, module, or port in the user-defined timebase before an alarm is generated. Allowable values are 1 to 15 collisions per good packet.

Errors

The errors threshold determines what percentage of total packets received by the repeater, module, or port within the specified timebase can be errors of the selected type or types before an alarm is triggered. Allowable values are one to 100; percentages will be calculated based on the number of error packets of all types selected. You can select any combination of the following error types:

CRC	If this check box is selected, all packets with Cyclical
	Redundancy Check (CRC) errors will be included in
	calculating the overall percentage of errors.

Using Alarm Configuration 3-3