Cabletron Systems EMM-E6 - Manual (Page 53)

Using Alarm Configuration 3-3
Alarm Configuration
Configuring Alarms
While configuring alarms for your EMM-E6 you must set the threshold and
timebase that will factor in triggering the alarm. From the repeater alarms
window you set an alarm timebase that applies to all enabled alarms at the
repeater, module and port level; this timebase is the interval (in seconds) over
which the selected variable(s) will be counted for comparison to the threshold
values. The thresholds are configured separately for each alarm type and at each
alarm level (repeater, module, and port). For example, if the Broadcasts alarm is
enabled, the repeater-level threshold is set at 1000, and the timebase is set to 10
seconds, the EMM-E6 will generate an alarm if 1000 broadcast packets are
processed within a 10-second time period; if the module-level threshold is set to
100, the EMM-E6 will also generate an alarm if 100 broadcast packets are
processed by that module within the 10-second time period.
You can set alarm thresholds for the following variables:
Traffic
The traffic threshold determines the total number of packets that can be processed
by the repeater, module, or port within the user-defined timebase before an alarm
is triggered. Allowable values are 1 to
≈
4 billion.
Collisions
The collisions threshold sets the number of collisions per good packet that will be
allowed on the repeater, module, or port in the user-defined timebase before an
alarm is generated. Allowable values are 1 to 15 collisions per good packet.
Errors
The errors threshold determines what percentage of total packets received by the
repeater, module, or port within the specified timebase can be errors of the
selected type or types before an alarm is triggered. Allowable values are one to
100; percentages will be calculated based on the number of error packets of all
types selected. You can select any combination of the following error types:
CRC If this check box is selected, all packets with Cyclical
Redundancy Check (CRC) errors will be included in
calculating the overall percentage of errors.
NOTE
Since alarm condition samples are taken at the end of the defined timebase interval, alarm
conditions which occur over the span of two timebase intervals will not be detected even if
the threshold is crossed within the defined timebase. For example, if the timebase is set to
10 seconds and the broadcast alarm threshold is set to 20, 20 or more broadcast packets
may be detected in the last 5 seconds of one time interval and the first five seconds of the
subsequent interval (for a total time interval of 10 seconds), but no alarm will be triggered
because the broadcasts occurred within two different timebase intervals. The shorter the
timebase, the more likely this condition is to occur.