66-9
Software Configuration Guide—Release IOS XE 3.3.0SG and IOS 15.1(1)SG
OL-25340-01
Chapter 66 Configuring Cisco IOS IP SLA Operations
Configuring IP SLAs Operations
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.
Note The IP SLA precision microsecond feature does not provide microsecond accuracy; it provides only
microsecond granularity of the timestamps.
To obtain 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).
To configure UDP jitter operation on the source device, perform this task:
Command Purpose
Step 1
configure terminal
Enters global configuration mode.
Step 2
ip sla operation-number
Creates an IP SLAs operation, and enter IP SLAs configuration mode.
Step 3
udp-jitter
{destination-ip-address |
destination-hostname}
destination-port [source-ip
{ip-address | hostname}]
[source-port port-number]
[control {enable | disable}]
[num-packets
number-of-packets] [interval
interpacket-interval]
Configures the IP SLAs operation as a UDP jitter operation, and enter UDP
jitter configuration mode.
• destination-ip-address | destination-hostname—Specify the destination IP
address or hostname.
• destination-port—Specify the destination port number in the range from 1
to 65535.
• (Optional) source-ip {ip-address | hostname}—Specify the source IP
address or hostname. When a source IP address or hostname is not
specified, IP SLAs chooses the IP address nearest to the destination
• (Optional) source-port port-number—Specify the source port number in
the range from 1 to 65535. When a port number is not specified, IP SLAs
chooses an available port.
• (Optional) control—Enable or disable sending of IP SLAs control
messages to the IP SLAs responder. By default, IP SLAs control messages
are sent to the destination device to establish a connection with the IP
SLAs responder
• (Optional) num-packets number-of-packets—Enter the number of
packets to be generated. The range is 1 to 6000; the default is 10.
• (Optional) interval inter-packet-interval—Enter the interval between
sending packets in milliseconds. The range is 1 to 6000; the default value
is 20 ms.
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