Cisco 2821 Jitter Failure

manjesh.michael · ‎07-10-2009

Dear All,

Intermittent Jitter failure in Cisco 2821 router. Show IP SLA satistics output gives "Latest operation return code: Socket bind error". Reachability between source and destination is perfectly fine and no packet drops.

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Jitter configuration

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ip sla 8

udp-jitter <Destination IP> 99 source-ip <Source IP> source-port 99 num-packets 100

frequency 300

ip sla schedule 8 life forever start-time now ageout 3600

Jitter error

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CISCO2821#sh ip sla statistics 8

IPSLAs Latest Operation Statistics

IPSLA operation id: 8

Latest RTT: 0 milliseconds

Latest operation start time: *10:54:37.511 IST xx xx xx

Latest operation return code: Socket bind error

RTT Values:

Number Of RTT: 0 RTT Min/Avg/Max: 0/0/0 milliseconds

Latency one-way time:

Number of Latency one-way Samples: 0

Source to Destination Latency one way Min/Avg/Max: 0/0/0 milliseconds

Destination to Source Latency one way Min/Avg/Max: 0/0/0 milliseconds

Jitter Time:

Number of SD Jitter Samples: 0

Number of DS Jitter Samples: 0

Source to Destination Jitter Min/Avg/Max: 0/0/0 milliseconds

Destination to Source Jitter Min/Avg/Max: 0/0/0 milliseconds

Packet Loss Values:

Loss Source to Destination: 0 Loss Destination to Source: 0

Out Of Sequence: 0 Tail Drop: 0

Packet Late Arrival: 0 Packet Skipped: 0

Voice Score Values:

Calculated Planning Impairment Factor (ICPIF): 0

Mean Opinion Score (MOS): 0

Number of successes: 0

Number of failures: 1181

Operation time to live: Forever

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Please suggest a solution.

Istvan_Rabai · ‎07-11-2009

Hi Michael,

I can suggest you 2 things:

1. In your configuration I do not see if you have enabled the ip sla responder on the destination router.

If not, you should enable it with the "ip sla responder" command.

2. Though it is not required to measure jitter, but to measure one-way packet delay it is required:

I suggest to configure NTP on both the 2821 router and the responder router so they have a common time source and their system times should be synchronized.

Cheers:

Istvan

manjesh.michael · ‎07-13-2009

Hi Istvan,

Thanks for the reply. I will implement IP SLA RESPONDER and NTP parameters on the router.

Thanks and Regards,

Manjesh Michael

Istvan_Rabai · ‎07-14-2009

Hi,

Important:

you should configure the destination router as an ip sla responder.

NTP should be configured on both routers so system times are closely synchronized. In that case you will get the most exact measurements.

But for jitter measurements only it is not required.

Cheers:

Istvan