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Community Member

IP SLA stats - one-way latency / MOS score 4.34 not updating

I'm trying to use Cisco IP SLA to bench mark voice traffic peformance before and after I apply QoS to the network. 

*  I've setup IP SLA in both directions over a DSL connection between a 7600, and an 1801

*  I've setup IP SLA in both directions over an Ethernet WAN link between a 7200 and another 7200

ip sla 1

udp-jitter 10.101.1.1 32770 source-ip 10.101.2.1 source-port 32770 codec g711alaw

frequency 30

!

ip sla schedule 1 life forever start-time now

!

ip sla responder

!

I have a problem in that I'm not getting any meaningful data from the IP SLA statistics for Voice Score Values:, or any data for Latency one-way time: for any of my tests(x 4).

After a day of testing it seems the MOS score never changes from 4.34, and the ICPIF never changes from 1

Is there something wrong with my config?  Is this working properly or could this be a bug?

ADSL-R1#show ip sla statistics 1 details

Round Trip Time (RTT) for       Index 1

        Latest RTT: 48 milliseconds

Latest operation start time: *09:27:48.435 UTC Thu Jul 5 2012

Latest operation return code: OK

Over thresholds occurred: FALSE

RTT Values:

        Number Of RTT: 999              RTT Min/Avg/Max: 45/48/89 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

        Source to Destination Latency one way Sum/Sum2: 0/0

        Destination to Source Latency one way Sum/Sum2: 0/0

Jitter Time:

        Number of Jitter Samples: 997

        Source to Destination Jitter Min/Avg/Max: 1/2/26 milliseconds

        Destination to Source Jitter Min/Avg/Max: 1/1/18 milliseconds

        Source to destination positive jitter Min/Avg/Max: 1/2/26 milliseconds

        Source to destination positive jitter Number/Sum/Sum2: 348/793/4295

        Source to destination negative jitter Min/Avg/Max: 1/2/16 milliseconds

        Source to destination negative jitter Number/Sum/Sum2: 346/802/3742

        Destination to Source positive jitter Min/Avg/Max: 1/1/18 milliseconds

        Destination to Source positive jitter Number/Sum/Sum2: 330/611/2051

        Destination to Source negative jitter Min/Avg/Max: 1/1/18 milliseconds

        Destination to Source negative jitter Number/Sum/Sum2: 318/606/1992

        Interarrival jitterout: 0       Interarrival jitterin: 0

Packet Loss Values:

        Loss Source to Destination: 0           Loss Destination to Source: 1

        Out Of Sequence: 0      Tail Drop: 0    Packet Late Arrival: 0

Voice Score Values:

        Calculated Planning Impairment Factor (ICPIF): 1

MOS score: 4.34

Number of successes: 72

Number of failures: 0

Operation time to live: Forever

Operational state of entry: Active

Last time this entry was reset: Never

7200-R2#show ip sla statistics details

Round Trip Time (RTT) for       Index 1

Type of operation: jitter

        Latest RTT: 6 ms

Latest operation start time: 08:08:31.349 UTC Thu Jul 5 2012

Latest operation return code: OK

RTT Values

        Number Of RTT: 1000

        RTT Min/Avg/Max: 2/6/199 ms

Latency one-way time milliseconds

        Number of Latency one-way Samples: 0

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

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

        Source to Destination Latency one way Sum/Sum2: 0/0

        Destination to Source Latency one way Sum/Sum2: 0/0

Jitter time milliseconds

        Number of SD Jitter Samples: 999

        Number of DS Jitter Samples: 999

        Source to Destination Jitter Min/Avg/Max: 0/2/13 ms

        Destination to Source Jitter Min/Avg/Max: 0/1/195 ms

        Source to destination positive jitter Min/Avg/Max: 1/1/13 ms

        Source to destination positive jitter Number/Sum/Sum2: 342/638/2142

        Source to destination negative jitter Min/Avg/Max: 1/1/11 ms

        Source to destination negative jitter Number/Sum/Sum2: 335/638/1886

        Destination to Source positive jitter Min/Avg/Max: 1/2/195 ms

        Destination to Source positive jitter Number/Sum/Sum2: 198/408/38510

        Destination to Source negative jitter Min/Avg/Max: 1/2/128 ms

        Destination to Source negative jitter Number/Sum/Sum2: 203/408/20720

        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

Voice Score Values

        Calculated Planning Impairment Factor (ICPIF): 1

MOS score: 4.34

Number of successes: 19

Number of failures: 0

Operation time to live: Forever

Operational state of entry: Active

Last time this entry was reset: 15:59:31.345 UTC Wed Jul 4 2012

3 REPLIES
Community Member

IP SLA stats - one-way latency / MOS score 4.34 not updating

After some further reading it looks like 'part' of the problem might be because the clocks on each pair of routers are not synced.

Community Member

IP SLA stats - one-way latency / MOS score 4.34 not updating

It seems by syncing the router clocks with NTP I am now getting Latency one-way stats.  The MOS and

ICPIF score remains unchanged however. 

show ip sla statistics 1

IPSLAs Latest Operation Statistics

IPSLA operation id: 1

Type of operation: udp-jitter

        Latest RTT: 4 milliseconds

Latest operation start time: 09:38:23 BST Tue Jul 10 2012

Latest operation return code: OK

RTT Values:

        Number Of RTT: 1000             RTT Min/Avg/Max: 3/4/28 milliseconds

Latency one-way time:

        Number of Latency one-way Samples: 36

        Source to Destination Latency one way Min/Avg/Max: 14/14/14 milliseconds

        Destination to Source Latency one way Min/Avg/Max: 0/4/14 milliseconds

Jitter Time:

        Number of SD Jitter Samples: 999

        Number of DS Jitter Samples: 999

        Source to Destination Jitter Min/Avg/Max: 0/1/18 milliseconds

        Destination to Source Jitter Min/Avg/Max: 0/2/17 milliseconds

Packet Loss Values:

        Loss Source to Destination: 0

        Source to Destination Loss Periods Number: 0

        Source to Destination Loss Period Length Min/Max: 0/0

        Source to Destination Inter Loss Period Length Min/Max: 0/0

        Loss Destination to Source: 0

        Destination to Source Loss Periods Number: 0

        Destination to Source Loss Period Length Min/Max: 0/0

        Destination to Source Inter Loss Period Length Min/Max: 0/0

        Out Of Sequence: 0      Tail Drop: 0

        Packet Late Arrival: 0  Packet Skipped: 0

Voice Score Values:

        Calculated Planning Impairment Factor (ICPIF): 1

        MOS score: 4.34

Number of successes: 64

Number of failures: 0

Operation time to live: Forever

Community Member

Re: IP SLA stats - one-way latency / MOS score 4.34 not updating

Update (RESOVLED)

The MOS and ICPIF scores do change.  I saturated the WAN link with FTP down/upload traffic inducing packet loss,increased jitter and delay.  The scores degraded accordingling show ip sla statistics 10 details

R#show ip sla statistics 10

Round Trip Time (RTT) for       Index 10
Type of operation: jitter
        Latest RTT: 292 ms
Latest operation start time: 19:07:12.358 UTC Tue Jul 17 2012
Latest operation return code: OK
RTT Values
        Number Of RTT: 979
        RTT Min/Avg/Max: 58/292/487 ms
Latency one-way time milliseconds
        Number of Latency one-way Samples: 1
        Source to Destination Latency one way Min/Avg/Max: 1/1/1 ms
        Destination to Source Latency one way Min/Avg/Max: 112/112/112 ms
Jitter time milliseconds
        Number of SD Jitter Samples: 958
        Number of DS Jitter Samples: 958
        Source to Destination Jitter Min/Avg/Max: 0/1/6 ms
        Destination to Source Jitter Min/Avg/Max: 0/11/151 ms
Packet Loss Values
        Loss Source to Destination: 0           Loss Destination to Source: 21
        Out Of Sequence: 0      Tail Drop: 0
        Packet Late Arrival: 0  Packet Skipped: 0
Voice Score Values
        Calculated Planning Impairment Factor (ICPIF): 10
MOS score: 4.09
Number of successes: 32
Number of failures: 0
Operation time to live: Forever

        Source to Destination Latency one way Sum/Sum2: 9591/94681
        Destination to Source Latency one way Sum/Sum2: 346227/125286895
Jitter time milliseconds
        Number of SD Jitter Samples: 999
        Number of DS Jitter Samples: 999
        Source to Destination Jitter Min/Avg/Max: 0/2/11 ms
        Destination to Source Jitter Min/Avg/Max: 0/10/48 ms
        Source to destination positive jitter Min/Avg/Max: 1/2/11 ms
        Source to destination positive jitter Number/Sum/Sum2: 231/513/2789
        Source to destination negative jitter Min/Avg/Max: 1/2/10 ms
        Source to destination negative jitter Number/Sum/Sum2: 232/512/2724
        Destination to Source positive jitter Min/Avg/Max: 1/15/48 ms
        Destination to Source positive jitter Number/Sum/Sum2: 305/4762/93106
        Destination to Source negative jitter Min/Avg/Max: 1/6/42 ms
        Destination to Source negative jitter Number/Sum/Sum2: 682/4717/43395
        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
Voice Score Values
        Calculated Planning Impairment Factor (ICPIF): 5
MOS score: 4.24
Number of successes: 43
Number of failures: 0
Operation time to live: Forever
Operational state of entry: Active
Last time this entry was reset: 17:51:41.945 BST Fri Jul 20 2012

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