3Com LINKBUILDER 3C18500, User Manual

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Counters and RMON Alarms D-11
DUA1850-0AAA05
Using Alarms
H ow to set up alarms is described in the manuals of your management
application.
The alarm carries the ability to define actions to be taken when the
alarm value rises above the high threshold, and/or falls below the low
threshold.
Two system alarms with default values will be automatically set up for
each port at initialization and whenever a new module is detected. The
system alarms form part of the 1024 maximum. The system alarms are
set up on the Smart Objects:
■
Percentage Bandwidth Used
■
Errors per 10,000 frames
The system alarms can be modified, but cannot be created or deleted
by a user. The default values are given in the table below.
Once alarms have been set up on a module in a particular slot, they
will be retained against that slot in any new configuration. This
situation may be made clearer by the following examples.
If a module is removed and replaced by a similar module, the
alarms will be retained on the new module.
If a module is swapped to another repeater backplane bus, the
alarms will be retained on that module.
Here is an example of how you may benefit from the power of alarms.
Broadcast Storms are capable of using most of the available
bandwidth of your network. If you set up an alarm on the Broadcast
Table D-3 Smart Object Default Values
Parameter Traffic Level Errors/10000 frames
high threshold 15% 200
low threshold recovery 10% 100
samples per average 4 4
period 15 seconds 15 seconds