We have configured IP SLA on two of our devices [ASR 1K and ISR 3900] for latency measurement, but can't get "one-way delay", could you please take a look at the configuration and advise what's the potential problem?
ROUTER_ASR>
ip sla 121
udp-jitter 10.251.64.4 5000 source-ip 10.234.128.24 num-packets 100
request-data-size 36
tos 104
frequency 300
IPSLA operation id: 121
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
ROUTER_ASR>show ntp assoc
address ref clock st when poll reach delay offset disp
*~146.170.96.220 146.170.124.36 4 612 1024 377 235.96 -1.446 30.399
+~146.170.56.220 146.170.124.36 4 922 1024 377 223.97 -2.407 30.382
* sys.peer, # selected, + candidate, - outlyer, x falseticker, ~ configured
ROUTER_ASR>show ntp status
Clock is synchronized, stratum 5, reference is 146.170.96.220
nominal freq is 250.0000 Hz, actual freq is 249.9962 Hz, precision is 2**6
reference time is E04D6361.BC6A8100 (04:28:17.736 GMT Tue Apr 2 2019)
clock offset is -1.4462 msec, root delay is 238.81 msec
root dispersion is 138.80 msec, peer dispersion is 30.39 msec
loopfilter state is 'CTRL' (Normal Controlled Loop), drift is 0.000014998 s/s
system poll interval is 1024, last update was 619 sec ago.
ROUTER_ISR >
ip sla 121
udp-jitter 10.234.128.24 5000 source-ip 10.251.64.4 num-packets 100
request-data-size 36
tos 104
frequency 300
IPSLA operation id: 121
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
ROUTER_ISR>show ntp assoc
address ref clock st when poll reach delay offset disp
*~146.170.56.220 146.170.124.36 4 51 1024 377 204.49 76.934 0.070
+~146.170.96.220 146.170.124.36 4 409 1024 377 215.90 76.070 0.091
* sys.peer, # selected, + candidate, - outlyer, x falseticker, ~ configured
ROUTER_ISR>sh ntp status
Clock is synchronized, stratum 5, reference is 146.170.56.220
nominal freq is 250.0000 Hz, actual freq is 249.9989 Hz, precision is 2**22
ntp uptime is 1103784700 (1/100 of seconds), resolution is 4016
reference time is E04D55A1.22308841 (03:29:37.133 GMT Tue Apr 2 2019)
clock offset is 76.9345 msec, root delay is 219.80 msec
root dispersion is 192.68 msec, peer dispersion is 0.07 msec
loopfilter state is 'CTRL' (Normal Controlled Loop), drift is 0.000004097 s/s
system poll interval is 1024, last update was 4279 sec ago.
I assume the issue is due to the clock offset being way too high. So, the solution is to synchronise the devices. How do i achieve this ?
Thank you. Any help would be really appreciated.
