3Com 7750 Series Command Reference Manual page 929

3Com Switch 7750 Series
Command Reference Guide – SNMP & RMON
Use the undo rmon prialarm command to remove a specified extended alarm entry.
The maximum number of distances in the table depends on the hardware resources.
Note:
Before adding an extended alarm entry, you need to use the rmon event command
to define the events to be referenced by the entry.
Make sure the node to be monitored exists before executing the rmon event
command.
You can define up to 50 extended alarm entries.
With an extended alarm entry defined in an extended alarm group, the network devices
perform the following operations accordingly:
Sampling the alarm variables referenced in the defined extended alarm
expressions (prialarm-formula) once in each period specified by the
sampling-timer argument.
Performing operations on sampled values according to the defined extended
alarm expressions (prialarm-formula)
Comparing the operation result with the set thresholds and perform corresponding
operations, as described in Table 2-8.
Table 2-8 Operation result and corresponding operation
The operation result is larger than or equal to the
set upper threshold (threshold-value1)
The operation result is smaller than or equal to
the set lower threshold (threshold-value2)
Example
# Add the extended alarm entry numbered 2 as follows:
Perform operations on the corresponding alarm variables using the expression
((1.3.6.1.2.1.16.1.1.1.4.1)*100).
Sampling interval: 10 seconds
Upper threshold: 50
Lower threshold: 5
Event 1 is triggered when the change ratio is larger than the upper threshold.
Event 2 is triggered when the change ratio is less than the lower threshold.
The alarm entry is valid forever.
Entry owner: user1
Comparison
2-14
Chapter 2 RMON Configuration Commands
Operation
Triggering the event identified
by the event-entry1 argument
Triggering the event identified
by the event-entry2 argument