Cabletron-systems 2000 User Manual download pdf (Page 151)

Alarm Limits 5-17

Managing Ethernet MicroLAN Switches

Figure 5-8. Port Alarm Limits Window

The Alarm Limits window displays the following Þelds:

Collisions

Use the text box in this Þeld to enter the number of collisions per good packet you

wish to allow on the selected repeater, board, or port before an alarm is generated;

allowable values are 1-15. For example, if you enter a value of 1, the alarm will be

generated if the repeater, board, or port experiences an average of one collision

per good packet received during the conÞgured time base (see the explanation for

Òwithin,Ó below). In terms of percentages, an alarm threshold value of 1 would

generate an alarm if 50% of your packets were collisions (one collision for every

good packet); a threshold value of 15 would generate an alarm if 93.75% of your

packets were collisions (15 collisions for every good packet). Therefore, the lower

you set your threshold value, the lower the percentage of collisions per good

packet you are allowing.

Remember, a repeater- or board-level alarm will calculate the number of collisions

per good packet based on all trafÞc received on the repeater channel; a port-level

alarm will make the calculation based on trafÞc on the speciÞc port only.

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Cabletron-systems 2000 User Manual Page 151