Agilent Technologies J3972A User's Guide Page 431

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430 5967–9446
Setting Alarms
An alarm triggers when a threshold for a specified network activity, or
monitored object, is crossed in a particular direction.
You can set an alarm to trigger when a monitored object goes above an
indicated value (a rising threshold), or when it drops below an indicated
value (a falling threshold). In addition, you can specify a threshold that
indicates when the alarm rearms, allowing it to trigger again.
You control what happens when an alarm triggers. You can have the
alarm generate a log entry on the agent, send a trap that is returned to
your management station, send a trap and execute a specified script on
the management station, or start (or stop) a packet capture.
For example, you could set an alarm to trigger when the data source de-
tects a high level of Ethernet error packets on the network. When the
alarm triggers, the agent sends a trap to your management station,
which executes a script that displays a dialog box on your screen, sends
you electronic mail, and dials your pager; in addition, the agent starts
capturing packets for analysis.
In order to set meaningful thresholds for alarms, you need to understand
what is “normal” for your network. NetMetrix includes several tools that
help you determine this information, including Reporter, discussed on
page 35, and Historical Statistics, discussed on page 475.
The following pages explain how to configure and manage alarms.
Multiple Interfaces
Alarms on multiple interfaces are fully supported for HP probes and
Cisco switches. For all other multi-interface agents, you cannot set an
alarm using a network interface other than 1 (that is, on a non-default
interface) from OpenView NNM. To configure such alarms, use Agent
Manager.
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