user manual

4-24
User Guide for Internetwork Performance Monitor
OL-11291-01
Chapter 4 Modifying IPM Components
Setting IPM Database Preferences
To edit the baseline:
Step 1 Select Edit > Baseline from the IPM Main Window.
The Edit Baseline window (Figure 4-9) appears.
Figure 4-9 Edit Baseline Window
Step 2 In the Enter New Baseline field, enter a percentage by which to increase the latency threshold. The valid
range is 1 to 999 (percent). The default is 20 (percent).
For example, if the current average latency is 100 milliseconds and you specify a baseline of 50, the new
rising threshold is 150 milliseconds (50% above the current average latency), and the falling threshold
is 50 ms (50% below the current average latency).
Step 3 Click OK.
The latency threshold is increased by the specified baseline percentage. The change is propagated to all
Running statistical collectors.
On IPM servers with a large number of collectors, the IPM client can seem unresponsive while the
baseline is being updated. This is due to the high volume of messages being received by the client during
this time.
Note IPM does not automatically refresh open statistics windows to reflect the new baseline. To display the
new baseline, close the statistics window and open it again.
For more detailed information about the Edit Baseline window, see the “Edit Baseline Window” topic in
the online help.
Setting IPM Database Preferences
For collectors that are using a statistical operation, IPM gathers network performance and error statistics
from the source router once every hour and stores the data in the IPM database. The collected hourly
data is used to calculate daily, weekly, and monthly data.
By default, IPM stores the collected data for the following periods:
• Hourly data for up to 32 days
• Daily data for up to 180 days
• Weekly data forever
• Monthly data forever