user manual

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User Guide for Internetwork Performance Monitor
OL-11291-01
Chapter 3 Using IPM to Measure Network Performance
Measuring Network Performance for IP
Measuring End-to-End Performance for IP
IPM’s Echo operations measure end-to-end performance between a source and any IP-enabled device.
Latency is computed by measuring the time taken between sending an ICMP echo request message to
the destination and receiving an ICMP echo reply. The IP Echo operation also measures availability and
errors for IP services.
With an IP Echo operation, you can determine performance on a specific path by using Loose Source
Routing. Additionally, IPM provides an option for measuring quality of service (QoS) between
endpoints by setting the DSCP and the type of service (ToS) bits on the IP packet.
To measure end-to-end performance for IP:
Step 1 Define a device as the source device from which to measure performance. For details on defining a
source device, see Defining a Source Device.
Step 2 Define a device as the target of ICMP echo requests from the source device. For details on defining a
target, see Defining a Target.
To control how statistics are collected, use the DefaultIPEcho operation or define your own IP Echo
operation. For details on defining an IP Echo operation, see Defining an IP Echo Operation.
Step 3 Define a collector to measure performance between the source and target you defined. For details on
defining a collector, see Defining a Collector. If you set the collector’s schedule to On Demand, start
the collector when needed.
Step 4 View the statistics in the Echo Historical Statistics window. For details on viewing end-to-end statistics
for IP, see Viewing End-to-End Statistics for IP.
Defining an IP Echo Operation
IPM provides a default IP Echo operation for measuring performance between a source and target. In
addition, IPM provides the option to create, modify, or delete your own IP Echo operations from the
Echo Operation Configuration window.
To define an IP Echo operation:
Step 1 From the IPM Main Window, select Edit > Configuration.
The Configuration window appears.
Step 2 Click Operation.
The Operation Configuration window appears within the Configuration window.
Step 3 Click Echo.
The Echo Operation Configuration window (Figure 3-11) appears.