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TRENDnet User's Guide
Configure parameters for RMON alarms
RMON > Alarm
RMON alarms are used to generate alert messages when packet activity
on designated ports rises above or falls below specified threshold values.
The alert messages can take the form of messages that are entered in the
event log on the switch or traps that are sent to your SNMP NMS software
or both.
RMON alarms consist of two thresholds. There is a rising threshold and a
falling threshold. The alarm is triggered if the value of the monitored
RMON statistic of the designated port exceeds the rising threshold. The
response of the switch is to enter a message in the event log, send an
SNMP trap, or both. The alarm is reset if the value of the monitored
statistic drops below the falling threshold.
The frequency with which the switch samples the thresholds of an alarm
against the actual RMON statistic is controlled by a time interval
parameter. You can adjust this interval for each alarm.
Here are the three components that comprise RMON alarms:
RMON statistics group: A port must have an RMON statistics
•
group configured if it is to have an alarm. When you create an
alarm, you specify the port to which it is to be assigned not by the
port number, but rather by the ID number of the port's statistics
group.
RMON event: An event specifies the action of the Switch when the
•
ingress packet activity on a port crosses a statistical threshold
defined in an alarm. The choices are to log a message in the event
log of the Switch, send an SNMP trap to an SNMP workstation, or
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both. Since there are only three possible actions and since events
can be used with more than one alarm, you probably will not
create more than three events.
Alarm: The last component is the alarm itself. It defines the port
•
statistic to be monitored and the rising and falling thresholds that
trigger the switch to perform an event. The thresholds of an alarm
can have the same event or different events. The switch supports
up to eight alarms.
TPE-4840WS
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