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IP SLA Jitter Monitoring

Hi All,

This concerns a problem with IP SLA jitter monitoring not set up through the CLI.

when setting up an IP SLA jitter probe with the CLI, monitoring works correctly & jitter statistics are displayed.

#show ip sla monitor configuration 1234

IP SLA Monitor, Infrastructure Engine-II.

Entry number: 1234

Owner:

Type of operation to perform: jitter

Target address: x.x.x.x

Source address: x.x.x.x

Target port: 7

Source port: 1

Request size (ARR data portion): 32

Operation timeout (milliseconds): 5000

Number of packets: 100

Interval (milliseconds): 50

Type Of Service parameters: 0x0

Control Packets: enabled

Operation frequency (seconds): 30

...

When setting this up through SNMP, the monitoring works for a few seconds and then stops. Jitter statistics are cleared (reset to zero's).

#show ip sla monitor configuration 8647

IP SLA Monitor, Infrastructure Engine-II.

Entry number: 8647

Owner: InfoVista Server

Type of operation to perform: jitter

Target address: x.x.x.x

Source address: x.x.x.x

Target port: 7

Source port: 0

Request size (ARR data portion): 460

Operation timeout (milliseconds): 2000

Number of packets: 100

Interval (milliseconds): 100

Type Of Service parameters: 0x0

Control Packets: disabled

Operation frequency (seconds): 60

...

I noticed that in the second configuration the Control Packets are disabled.

Only thing that Cisco release notes mentions about this: "Do not use the control keyword with this command (type jitter). The control disable keyword combination will disable IP SLAs control packets and cause the operation to malfunction. The default is control enable."

So, it seems that this Control Packets option should always be enabled.

Remote SLA responders are configured identically.

Can anyone give me more technical info about these Control Packets and how to correctly setup the probe configuration (not through CLI)?

Multiple probes are configured on the systems; they need to be configured through SNMP.

Running on Cisco systems 3845 with IOS 12.4(25b).

Thanks

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