Cisco Systems OL-11291-01 Manual De Usuario

If you selected more than one collector, their statistics appear in a single graph in the Historical 
Statistics—Multi-Collector Graph window (see 

 for 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.

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.

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:

Define a device as the source device from which to measure performance. For details on defining a 
source device, see 

Define a device as the target of discovery requests from the source device. For details on defining a 
target, see 

.

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 

Define a collector to measure performance between the source router and target you defined. For details 
on defining a collector, see 

. If you set the collector’s schedule to On Demand, start 

the collector when needed.

View the statistics in the Enhanced UDP Historical Statistics window. For details on viewing end-to-end 
statistics for Enhanced UDP, see