Alarms - TRENDnet PoE Web Smart Switch Series User Manual

TRENDnet User's Guide

Alarms

System > RMON > Alarms
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 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.
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1. Log into your switch management page (see
on page 5).
2. Click on System, click on RMON, and click on Alarm.
3. Review the settings.

Index: This parameter specifies the ID number of the new group. The range is 1
to 65535.

Interval: This parameter specifies the time (in seconds) over which the data is
sampled. Its range is 1 to 2147483647 seconds.

Variable: This parameter specifies the RMON MIB object that the event is
monitoring.

Sample type: This parameter defines the type of change that has to occur to
trigger the alarm on the monitored statistic. There are two choices from the
pull-down menu - Delta value and Absolute value. Delta value- setting
compares a threshold against the difference between the current and previous
values of the statistic. Absolute value- setting compares a threshold against the
current value of the statistic.

Rising Threshold: This parameter specifies a specific value or threshold level of
the monitored statistic. When the value of the monitored statistic becomes
greater than this threshold level, an alarm event is triggered. The parameter's
range is 1 to 2147483647.

Falling Threshold: This parameter specifies a specific value or threshold level of
the monitored statistic. When the value of the monitored statistic becomes less
than this threshold level, an alarm event is triggered. The parameter's range is
1 to 2147483647.

Rising Event Index: This parameter specifies the event index for the rising
threshold. Its range is 1 to 65535. This field is mandatory and must match an
Event Index that you previously entered in "Events".

Falling Event Index: This parameter specifies the event index for the falling
threshold. Its range is 1 to 65535. This field is mandatory and must match an
Event Index that you previously entered in "Events".

Owner: This parameter is used to identify the person who created an entry. It is
primarily intended for switches that are managed by more than one person,
and is an optional field.
PoE Web Smart Switch Series
"Access your switch management page"
33