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页码 454
10-17
Expert Features
Working with the Expert System
10
The tree can be expanded or collapsed by clicking on the plus or minus icon, 
double-clicking on the item, or using direction keys. The checkbox can be checked 
or unchecked by clicking on the checkbox or by selecting the symptom and pressing 
the 
Space
 bar. The edit control is activated by selecting the value and clicking on it 
or pressing the 
Space
 bar. 
When a setting is changed, the number is checked against minimum and maximum 
values. Clicking anywhere inside the dialog box besides the edit control or pressing 
Return
 key closes the edit control and enters the new configuration value. Pressing 
the 
Escape
 key restores the original value.
Module Settings for the Expert System
Turning the expert system on or off can be controlled on a per-device basis. Select 
Module 
 Settings...
 from the 
Configuration
 menu. From the 
Modes
 tab, turn on/off 
the expert system using the check box. 
Setting Expert Alarms
Expert Alarms allows you to set thresholds related to Expert Symptoms. Alarms can 
be configured to perform an action such as a page or e-mail, as with all other 
Surveyor alarms. Alarms test for thresholds at different protocol layers, such as the 
number of NFS retransmissions at the application layer or a specific overload 
utilization percentage at the MAC layer.
Some network problems are not single events, but are indicated by certain 
thresholds or counters being exceeded. To catch these type of problems, use Expert 
Alarms. Many event counters within the Expert Alarm Table that can be used to 
flag network conditions that are not single events, such as excessive multicast 
broadcasts.
Customizing Expert Diagnostic Information
Surveyor provides diagnostic information that is general to all networks. However, 
you can customize the diagnostic information to suit your environment.
As you use any diagnostic system you may find that certain error events occur 
regularly and or that events have a unique meaning in your environment. Custom 
solutions may apply to fixing the problems that are indicated by expert symptoms. 
By customizing the diagnostic information, you build an “information base” that 
applies to your particular environment. When the same problems occur, the custom 
information displays as well as standard information, providing the diagnostician 
with the benefit of previous experience related to your particular network.