08-05-2011 06:46 AM - edited 03-04-2019 01:11 PM
Hi eveybody,
I've set QoS throughout the whole network, and I have set SAA to test if everything works the way I want. I've typed the command
sh rtr collection-statistics but then I don't understand what's being displayed. There's not much information on cisco's website except some defenition of the terms which don't help me much and I'm wondering how I'm supposed to measure de jitter between my router A and B.
If someone could tell me how to read it simply, I just want the delay from source to destination and the vice-versa.
If someone knows some other way to measure those values, well I'll try it.
Thank you in advance.
CR_1#sh rtr collection-statistics
Entry number: 1
Start Time Index: .12:34:06.404 CEST Fri Aug 5 2011
Number of successful operations: 60
Number of operations over threshold: 0
Number of failed operations due to a Disconnect: 0
Number of failed operations due to a Timeout: 0
Number of failed operations due to a Busy: 0
Number of failed operations due to a No Connection: 0
Number of failed operations due to an Internal Error: 0
Number of failed operations due to a Sequence Error: 0
Number of failed operations due to a Verify Error: 0
Voice Scores:
MinOfICPIF: 0 MaxOfICPIF: 0 MinOfMOS: 0 MaxOfMOS: 0
RTT Values:
NumOfRTT: 59219 RTTAvg: 41 RTTMin: 29 RTTMax: 325
RTTSum: 2436709 RTTSum2: 105338059
Packet Loss Values:
PacketLossSD: 19 PacketLossDS: 229
PacketOutOfSequence: 0 PacketMIA: 533 PacketLateArrival: 0
InternalError: 0 Busies: 0
Jitter Values:
MinOfPositivesSD: 1 MaxOfPositivesSD: 124
NumOfPositivesSD: 20331 SumOfPositivesSD: 109748 Sum2PositivesSD: 890214
MinOfNegativesSD: 1 MaxOfNegativesSD: 28
NumOfNegativesSD: 33377 SumOfNegativesSD: 109967 Sum2NegativesSD: 536367
MinOfPositivesDS: 1 MaxOfPositivesDS: 60
NumOfPositivesDS: 16551 SumOfPositivesDS: 41946 Sum2PositivesDS: 254888
MinOfNegativesDS: 1 MaxOfNegativesDS: 36
NumOfNegativesDS: 18658 SumOfNegativesDS: 41557 Sum2NegativesDS: 206045
Interarrival jitterout: 0 Interarrival jitterin: 0
One Way Values:
NumOfOW: 133
OWMinSD: 121 OWMaxSD: 132 OWSumSD: 16777 OWSum2SD: 2117655
OWMinDS: 1 OWMaxDS: 201 OWSumDS: 4959 OWSum2DS: 389027
Start Time Index: .13:34:06.401 CEST Fri Aug 5 2011
Number of successful operations: 22
Number of operations over threshold: 0
Number of failed operations due to a Disconnect: 0
Number of failed operations due to a Timeout: 0
Number of failed operations due to a Busy: 0
Number of failed operations due to a No Connection: 0
Number of failed operations due to an Internal Error: 0
Number of failed operations due to a Sequence Error: 0
Number of failed operations due to a Verify Error: 0
Voice Scores:
MinOfICPIF: 0 MaxOfICPIF: 0 MinOfMOS: 0 MaxOfMOS: 0
RTT Values:
NumOfRTT: 21685 RTTAvg: 40 RTTMin: 29 RTTMax: 165
RTTSum: 876298 RTTSum2: 36001570
Packet Loss Values:
PacketLossSD: 16 PacketLossDS: 116
PacketOutOfSequence: 0 PacketMIA: 183 PacketLateArrival: 0
InternalError: 0 Busies: 0
Jitter Values:
MinOfPositivesSD: 1 MaxOfPositivesSD: 129
NumOfPositivesSD: 7347 SumOfPositivesSD: 38547 Sum2PositivesSD: 298911
MinOfNegativesSD: 1 MaxOfNegativesSD: 27
NumOfNegativesSD: 12315 SumOfNegativesSD: 38583 Sum2NegativesSD: 177697
MinOfPositivesDS: 1 MaxOfPositivesDS: 15
NumOfPositivesDS: 5962 SumOfPositivesDS: 15738 Sum2PositivesDS: 88530
MinOfNegativesDS: 1 MaxOfNegativesDS: 16
NumOfNegativesDS: 7626 SumOfNegativesDS: 15696 Sum2NegativesDS: 65900
Interarrival jitterout: 0 Interarrival jitterin: 0
One Way Values:
NumOfOW: 0
OWMinSD: 0 OWMaxSD: 0 OWSumSD: 0 OWSum2SD: 0
OWMinDS: 0 OWMaxDS: 0 OWSumDS: 0 OWSum2DS: 0
08-05-2011 12:59 PM
Hello Vincent,
Please see the link below in order to have a detailed understanding on the
sh rtr collection-statistics
http://www.cisco.com/en/US/docs/ios/12_3/configfun/command/reference/cfr_1g09.html#wp1080239
Please note : Effective with Cisco IOS Release 12.3(14)T, the show rtr collection-statistics command is replaced by the show ip sla monitor collection-statistics command.
Thanks,
Ricky Micky
Rate this answer if it is helpful to you
08-08-2011 05:11 AM
Well thank you for your reply, unfortunately it didn't really answer my question, the page you refered me to doesn't give much information on how to deduce the jitter in ms from source to destination and vice versa. The définition of the different values give me much help on how to put them together in order to find the information I'm looking for.
If you know a way of doing it, please let me know and show me an example with the statistic I posted the last time.
Thank you.
08-08-2011 06:01 AM
Hello Vincent,
You can refer the tabulation 101 in the above link to get the definition of the different values,
Jitter Values:
Indicates that Jitter statistics appear on the following lines.
Jitter is inter-packet delay variance.
NumOfJitterSamples:
The number of jitter samples collected. This is the number of samples that are used to calculate the following jitter statitstics.
MinOfPositivesSD
MaxOfPositivesSD
The minimum and maximum positive jitter values from source to destination, in milliseconds.
NumOfPositivesSD
The number of jitter values from source to destination that are positive (i.e., network latency increases for two consecutive test packets).
SumOfPositivesSD
The sum of those positive values (in milliseconds).
Sum2PositivesSD
The sum of squares of those positive values.
MinOfNegativesSD
MaxOfNegativesSD
The minimum and maximum negative jitter values from source to destination. The absolute value is given.
NumOfNegativesSD
The number of jitter values from source to destination that are negative (i.e., network latency decreases for two consecutive test packets).
SumOfNegativesSD
The sum of those values.
Sum2NegativesSD
The sum of the squares of those values.
Interarrival jitterout:
The source to destination(SD) jitter value calculation, as defined in RFC 1889.
Interarrival jitterin:
The destination to souce (DS) jitter value calculation, as defined in RFC 1889.
One Way Values
Indicates that one way measurement statistics appear on the following lines.
One Way (OW) Values are the amount of time it took the packet to travel from the source router to the target router (SD) or from the target router to the source router (DS).
NumOfOW
Number of successful one way time measurements.
OWMinSD
Minimum time from the source to the destination.
OWMaxSD
Maximum time from the source to the destination.
OWSumSD
Sum of the OWMinSD and OWMaxSD values.
OWSum2SD
Sum of the squares of the OWMinSD and OWMaxSD values.
Coming to the Jitter calculation, I have taken the values from the output that you have posted initially,
Formula :
rttMonLatestJitterOperAvgJitter = (jitterSum / jitterNum)
Where:
jitterSum = sumOfPositiveDS + sumOfNegativeDS + sumOfPositiveSD + sumOfNegativeSD
jitterNum = "Number of DS jitter samples" + "Number of SD jitter samples"
SumOfPositivesDS: 41946 ;
SumOfNegativesDS: 41557
SumOfPositivesSD: 109748
SumOfNegativesSD: 109967
NumOfPositivesDS: 16551
NumOfNegativesDS: 18658
NumOfNegativesSD: 33377
NumOfPositivesSD: 20331
Avg Jitter = 303218/88917 = 3ms
Hope this helps.
Thanks,
Ricky Micky
Pls Rate if this is useful
08-08-2011 09:33 AM
Well thank you very much, it really helps me, so I guess the jitter in my network is not too bad. Thank you again.
06-27-2012 02:19 PM
I am just delving into the use of rtr, and I am having a problem of obtaining the One Way Values.
I have synchronized my clocks, and I obtain One Way Values after I have reloaded both routers and have started the rtr. However, after a period of time, these revert to 0. Even after I reset the rtr and configure a new rtr, these remain at 0.
Any insight would be appreciated.
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