Enterasys Networks 700 - Manual (Page 132)

Alarm Configuration
4-16 Advanced Alarm Configuration
4. To select the Variable to be used for your alarm, use the MIB Tree display
provided on the right side of the window. (For more information about how to
use the MIB Tools utility, see the
Tools Guide.) The display will default to the
top of the tree (labeled Internet); there are two ways to locate and/or assign
the correct variable:
a. If you know the exact name of the OID value you wish to track (including
its capitalization), enter the name in the Alarm Variable field; to verify that
you have entered the name correctly, click on the Find-> button to move
the MIB Tree display to that OID. (If the MIB Tree display does not adjust
to show the OID you have entered, then you entered the name incorrectly;
remember, the case must match exactly).
b. Use the scroll bars and click to open the appropriate folders in the MIB
Tree display to locate the object you wish you use; click to select it in the
panel, and its name will automatically be entered in the Alarm Variable
field.
Almost any RMON or MIB-II object can be used as an alarm variable as long
as it is resident in the device firmware and its value is defined as an integer
(including counters, timeticks, and gauges). If you select an invalid object (i.e.,
one whose value is not an integer), the message “!!Can’t set alarm on this
type!!” will display in the Alarm Variable field.
5. Once you have selected the object you wish to use for your alarm variable,
you must assign the appropriate instance value in the Alarm Instance field.
Most RMON objects are instanced by the index number assigned to the table
TIP
The only thing that determines whether you are modifying an existing alarm or creating a
new one is the assignment of the index number; be sure to assign this value appropriately.
TIP
If you don’t know the exact spelling of the OID you wish to use for your alarm variable,
and you can’t find it by searching through the tree, use the MIB Tools utility’s Find
feature to locate the OID and determine its exact spelling (and tree location). For more
information on the MIB Tools utility and its Find capabilities, see the Tools Guide.
NOTE
If you select an object which is not resident in the device firmware, you will receive a “Set
Failed; ensure variable is readable” message when you try to set your alarm by clicking on
the Apply button. If you are unsure just which objects are resident on your device, and
you find yourself receiving a lot of “Set Failed” messages, you can use the MIB Tools
utility (accessed from the main console window menu bar or from a Device View) to
determine which objects are and are not part of your device’s firmware — simply query
the object you are interested in; if the query response comes back empty, the object is not
present (make sure you are using the appropriate community name when making a query,
or you will get no response).