Cisco Systems OL-11291-01 manual Measuring Network Performance for Enhanced UDP

Chapter 3 Using IPM to Measure Network Performance

Measuring Network Performance for Enhanced UDP

If you selected more than one collector, their statistics appear in a single graph in the Historical Statistics—Multi-Collector Graph window (see Figure 2-14for an example).

For more detailed information about the statistics displayed in the UDP Historical Statistics window, see the “UDP Historical Statistics Window” topic in the online help.

Measuring Network Performance for Enhanced UDP

The Enhanced UDP operation for Voice over IP measures round-trip latency, packet loss, and jitter in IP networks by generating synthetic UDP traffic. The Enhanced UDP operation sends a defined number of packets of a defined size from the source to a target with a defined interpacket delay.

Both the source and the target must be running version 12.1 or later of the Cisco IOS software, and the SA Agent Responder must be enabled on the target.

To enable the SA Agent Responder on the target, use the rtr responder IOS configuration command. The packets sent out to measure jitter contain packet sequence information, as well as sending and receiving timestamps from the source and the Responder.

Note The Enhanced UDP operation sends only UDP data traffic, and does not send any voice packets.

The Enhanced UDP operation measures the following network performance statistics:

•Round-trip network latency

•Per-direction packet loss

•Per-direction interpacket delay variance (jitter)

•Network availability and errors

To measure end-to-end performance for Enhanced UDP:

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 discovery requests from the source device. For details on defining a target, see Defining a Target.

To control how statistics are collected, use one of the default Enhanced UDP operations or define your own Enhanced UDP operation. For details on defining an Enhanced UDP operation, see Defining an Enhanced UDP Operation.

Step 3 Define a collector to measure performance between the source router 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 Enhanced UDP Historical Statistics window. For details on viewing end-to-end statistics for Enhanced UDP, see Viewing Statistics for Enhanced UDP.

	User Guide for Internetwork Performance Monitor
OL-11291-01		3-39