IP SLAs - ICMP Path Jitter provides hop-by-hop jitter, packet loss, and delay measurement statistics in an IP network. Path
jitter operations function differently than the standard UDP Jitter operation, which provides total one-way data and total
round-trip data.
An ICMP Path Jitter operation can be used a supplement to the standard UDP Jitter operation. For example, results from a
UDP Jitter operation may indicate unexpected delays or high jitter values; an ICMP Path Jitter operation could then be used
to troubleshoot the network path and determine if traffic is bottlenecking in a particular segment along the transmission
path.
The operation first discovers the hop-by-hop IP route from the source to the destination using a traceroute utility, and
then uses ICMP echoes to determine the response times, packet loss and approximate jitter values for each hop along the path.
The jitter values obtained using IP SLAs - ICMP Path Jitter are approximates because ICMP only provides round trip times.
ICMP Path Jitter operations function by tracing the IP path from a source device to a specified destination device, then
sending
N number of Echo probes to each hop along the traced path, with a time interval of
T milliseconds between each Echo probe. The operation as a whole is repeated at a frequency of once every
F seconds. The attributes are user-configurable, as shown here:
Path Jitter Operation Parameter
|
Default
|
Configured Using:
|
Number of echo probes (N )
|
10 echos
|
path-jitter
command,
num-packets option
|
Time between Echo probes, in milliseconds (T )
|
20 ms
|
path-jitter
command,
interval option
Note
|
The operation’s frequency is different than the operation’s interval.
|
|
The frequency of how often the operation is repeated (F )
|
once every 60 seconds
|
frequency
command
|