User manual

HAPTER

| Configuring the Switch

Configuring Security

– 80 –

CONFIGURING RMON ALARMS

Use the RMON Alarm Configuration page to define specific criteria that will

generate response events. Alarms can be set to test data over any

specified time interval, and can monitor absolute or changing values (such

as a statistical counter reaching a specific value, or a statistic changing by

a certain amount over the set interval). Alarms can be set to respond to

rising or falling thresholds. However, note that after an alarm is triggered it

will not be triggered again until the statistical value crosses the opposite

bounding threshold and then back across the trigger threshold.

PATH

Advanced Configuration, Security, RMON, Alarm

PARAMETERS

The following parameters are displayed:

◆ ID – Index to this entry. (Range: 1-65535)

◆ Interval – The polling interval. (Range: 1-2^31 seconds)

◆ Variable – The object identifier of the MIB variable to be sampled.

Only variables of the type ifEntry.n.n may be sampled.

Note that ifEntry.n uniquely defines the MIB variable, and ifEntry.n.n

defines the MIB variable, plus the ifIndex. For example,

1.3.6.1.2.1.2.2.1.1.10.1 denotes ifInOctets, plus the ifIndex of 1.

Possible variables (ifEntry.n, where n = 10-21) include: InOctets,

InUcastPkts, InNUcastPkts, InDiscards, InErrors, InUnknownProtos,

OutOctets, OutUcastPkts, OutNUcastPkts, OutDiscards, OutErrors, and

OutQLen.

◆ Sample Type – Tests for absolute or relative changes in the specified

variable.

■

Absolute – The variable is compared directly to the thresholds at

the end of the sampling period.

■

Delta – The last sample is subtracted from the current value and

the difference is then compared to the thresholds.

◆ Value – The value of the statistic during the last sampling period.

◆ Startup Alarm – The method of sampling the selected variable and

calculating the value to be compared against the thresholds. Possible

sample types include:

■

Rising – Trigger alarm when the first value is larger than the rising

threshold.

■

Falling – Trigger alarm when the first value is less than the falling

threshold.