[c-nsp] IP SLA - all zero's for latency one-way measurements

Thu Aug 27 09:53:01 EDT 2015

Anyone know why I would be seeing zero's for latency ?  It just seems to
come and go. sometimes I see all zero's and other times I see numbers that
seem realistic.  I would expect some latency. actually about 7 milliseconds
of round trip latency is expected.. But zero latency seems weird to me.

This is today..

tower-43-901#sh ip sla stat | in Latency one way Min/Avg/Max

        Source to Destination Latency one way Min/Avg/Max: 0/0/1
milliseconds

        Destination to Source Latency one way Min/Avg/Max: 6/6/7
milliseconds

        Source to Destination Latency one way Min/Avg/Max: 3/3/4
milliseconds

        Destination to Source Latency one way Min/Avg/Max: 3/3/4
milliseconds

This was yesterday.

tower-43-901#sh ip sla statistics  | in Latency one way Min/Avg/Max

        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 Min/Avg/Max: 0/0/0
milliseconds

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

tower-43-901#

tower-43-901#sh ip sla statistics

IPSLAs Latest Operation Statistics

IPSLA operation id: 24300

Type of operation: udp-jitter

        Latest RTT: 6 milliseconds

Latest operation start time: 14:23:35 CDT Wed Aug 26 2015

Latest operation return code: OK

RTT Values:

        Number Of RTT: 10               RTT Min/Avg/Max: 6/6/7 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: 9

        Number of DS Jitter Samples: 9

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

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

Over Threshold:

        Number Of RTT Over Threshold: 0 (0%)

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): 0

        Mean Opinion Score (MOS): 0

Number of successes: 17

Number of failures: 0

Operation time to live: Forever

IPSLA operation id: 24310

Type of operation: udp-jitter

        Latest RTT: 6 milliseconds

Latest operation start time: 14:23:35 CDT Wed Aug 26 2015

Latest operation return code: OK