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Cisco IE 2000 Switch Software Configuration Guide
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Chapter 45 Configuring Cisco IOS IP SLAs Operations
How to Configure Cisco IOS IP SLAs Operations
Round-trip delay (average round-trip time)
Because the paths for the sending and receiving of data can be different (asymmetric), you can use the
per-direction data to more readily identify where congestion or other problems are occurring in the
network.
The UDP jitter operation generates synthetic (simulated) UDP traffic and sends a number of UDP
packets, each of a specified size, sent a specified number of milliseconds apart, from a source router to
a target router, at a given frequency. By default, ten packet-frames, each with a payload size of 10 bytes
are generated every 10 ms, and the operation is repeated every 60 seconds. You can configure each of
these parameters to best simulate the IP service you want to provide.
To provide accurate one-way delay (latency) measurements, time synchronization, such as that provided
by NTP, is required between the source and the target device. Time synchronization is not required for
the one-way jitter and packet loss measurements. If the time is not synchronized between the source and
target devices, one-way jitter and packet loss data is returned, but values of 0 are returned for the
one-way delay measurements provided by the UDP jitter operation
Note Before you configure a UDP jitter operation on the source device, you must enable the IP SLAs
responder on the target device (the operational target).

IP Service Levels by Using the ICMP Echo Operation

The ICMP echo operation measures end-to-end response time between a Cisco device and any devices
using IP. Response time is computed by measuring the time taken between sending an ICMP ec ho
request message to the destination and receiving an ICMP echo reply. Many customers use IP SLAs
ICMP-based operations, in-house ping testing, or ping-based dedicated probes for response time
measurements between the source IP SLAs device and the destination IP device. The IP SLAs ICMP
echo operation conforms to the same specifications as ICMP ping testing, and the two methods result in
the same response times.
Note This operation does not require the IP SLAs responder to be enabled.
How to Configure Cisco IOS IP SLAs Operations
Note Not all of the IP SLAs commands or operations described in this gui de are supported on the switch. The
switch supports IP service level analysis by using UDP jitter, UDP echo, HTTP, TCP connect, ICMP
echo, ICMP path echo, ICMP path jitter, FTP, DNS, and DHCP, as well as multiple operation scheduling
and proactive threshold monitoring. It does not support VoIP service levels using the gatekeeper
registration delay operations measurements.