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New Member

IP SLA UDP Jitter configuration

Hi, I have to configure/use IP SLA via CLI on the Cisco routers.  The customer would like me to measure 3 elements:-

1. The average time taken when 2 test packets of 64bytes are sent every minute, 24 hours a day with a limit of 20milliseconds

2.  The percentage of all data packets successfully delivered

3. The percentage of all data packets successfully delivered with Jitter recorded at less than or = to 5milliseconds.

4. Measure MOS - in all cases MOS should not fall below 3.7

Config for Measurement 1 and 3 and maybe 2.

oc-boieb-test-dmd-eu#sh run | begin ip sla
ip sla 1
udp-jitter 10.80.102.129 5000 source-ip 10.80.102.32 source-port 5000 num-packets 2 interval 30000
request-data-size 64
owner Conor_K
ip sla schedule 1 life forever start-time now

!!

oc-boieb-test-dmd-eu#sh ip sla statistics aggregated details

Round Trip Time (RTT) for Index 1
Start Time Index: 11:39:34.099 GMT Mon Nov 30 2009
Type of operation: udp-jitter
Voice Scores:
MinOfICPIF: 0 MaxOfICPIF: 0 MinOfMOS: 0 MaxOfMOS: 0
RTT Values:
Number Of RTT: 16  RTT Min/Avg/Max: 19/24/101 milliseconds
Latency one-way time:
Number of Latency one-way Samples: 1
Source to Destination Latency one way Min/Avg/Max: 64/64/64 milliseconds
Destination to Source Latency one way Min/Avg/Max: 37/37/37 milliseconds
Source to Destination Latency one way Sum/Sum2: 64/4096
Destination to Source Latency one way Sum/Sum2: 37/1369
Jitter Time:
Number of SD Jitter Samples: 8
Number of DS Jitter Samples: 8
Source to Destination Jitter Min/Avg/Max: 0/11/81 milliseconds
Destination to Source Jitter Min/Avg/Max: 0/1/1 milliseconds
Source to destination positive jitter Min/Avg/Max: 81/81/81 milliseconds
Source to destination positive jitter Number/Sum/Sum2: 1/81/6561
Source to destination negative jitter Min/Avg/Max: 0/0/0 milliseconds
Source to destination negative jitter Number/Sum/Sum2: 0/0/0
Destination to Source positive jitter Min/Avg/Max: 1/1/1 milliseconds
Destination to Source positive jitter Number/Sum/Sum2: 5/5/5
Destination to Source negative jitter Min/Avg/Max: 0/0/0 milliseconds
Destination to Source negative jitter Number/Sum/Sum2: 0/0/0
Interarrival jitterout: 0 Interarrival jitterin: 0
Over thresholds occurred: FALSE
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
Number of successes: 8
Number of failures: 0
Failed Operations due to over threshold: 0
Failed Operations due to Disconnect/TimeOut/Busy/No Connection: 0/0/0/0
Failed Operations due to Internal/Sequence/Verify Error: 0/0/0

Distribution Statistics:
Bucket Range: 0 to < 20ms
Avg. Latency: 24 ms
Percent of Total Completions for this Range: 100 %
Number of Completions/Sum of Latency: 8/193
Sum of RTT squared low 32 Bits/Sum of RTT squared high 32 Bits: 6127/0
Operations completed over thresholds: 0

So, I was going to use UDP Jitter for measurement 1,2 and 3 - are the parameters above correct?

But I'm unsure how to measure 2 and 4 above plus I am also not sure how to read the output I get when I run the ip sla statistics for

Measurement1 and 3 above.

Any help is appreciated?

Regards

Mary

2 REPLIES
Cisco Employee

Re: IP SLA UDP Jitter configuration

I would probably go with something like:

ip sla 1
udp-jitter 10.80.102.129 5000 source-ip 10.80.102.32 source-port 5000 codec g711ulaw codec-numpackets 2 codec-interval 30000 codec-size 64
timeout 20
threshold 5

This way, you separate your timeout from your threshold.  Any probe which has latency higher than 20 ms will be an error, while any higher than 5 will show up as being over threshold.  Therefore, 2 and 3 should be easy to see (2 is simply the number of successes divided by the number of attempts times 100).

The MOS score is seen in the output of "show ip sla stats 1" while "show ip sla stats agg 1" will show you the min and max MOS.

New Member

Hi Mary,Hopefully I can get

Hi Mary,

Hopefully I can get some inputs from you since it is old thread but I am doing the similar config.

Do you have any idea why I am getting many zero readings for per-direction jitter? I synchronized all the involved routers to the same timing source. 

Thanks,

Bo

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