LevelOne GEP-5070, Руководство пользователя

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C
HAPTER
4
| Configuring the Switch
Configuring Security
– 80 –
C
ONFIGURING
RMON A
LARMS
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.
P
ATH
Advanced Configuration, Security, RMON, Alarm
P
ARAMETERS
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.