Specifications

9031280 E4 Configuring RMON Alarms and Events
6-3
RMON Alarms
Creating an Alarm
5. Click on the Status button and select createRequest from the Status
menu.
6. Click on the Start-up Alarm button and select the type of threshold that
will trigger this alarm. Threshold types are:
• Rising—The value for the monitored object rises above the threshold
• Falling—The value for the monitored object falls below the threshold
• Rising_or_Falling—The value for the monitored object rises above
or falls below the threshold
7. Click in the Variable field and enter the object ID (OID) you want to
monitor. (You can monitor any OID in the SNMP MIB of the device.) See
Appendix B for a listing and description of RMON objects and OIDs.
(An OID is a numerical representation of an RMON object. If you are
unfamiliar with OIDs, see RFCs 1271 and 1513 for information about
Ethernet and Token Ring objects and OIDs.)
When you enter an OID, you must append the number of the interface (on
which the object will be monitored) to the object’s OID. For example,
assume that you modeled an EMME that has four interfaces and you want
to create an alarm for the object etherStatsOctets on interface 1. To
monitor the object on network interface 1, you would enter the OID in the
following format:
8. In the Threshold Information box, click in the Falling Threshold field and
enter the low threshold for the sampled statistic. A single alarm is
generated for the object if either of the following conditions is met:
• The current sampled value is less than or equal to this threshold, and
the current value at the last sampling interval was greater than this
threshold.
• The first sample taken after this entry became valid is less than or
equal to this threshold, and the associated Startup Alarm is equal to
Falling or Rising_or_Falling.
After a falling alarm is generated, a second one is not generated until the
sampled value rises above the Falling Threshold and reaches the Rising
Threshold.
9. Click in the Falling Event Index field and enter the index of the Falling
Threshold Event definition. This is the event in the Event Table which
will be generated when this Falling Threshold Alarm is triggered. Use this
1.3.6.1.2.1.16.1.1.1.4 .1
the OID for etherStatsOctets
the network interface
number