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Frequent clock changes

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  • 1.  Frequent clock changes

    Posted Oct 10, 2017 02:59 AM

    Hi,

    on our HPE Moonshot IRF switch I see very frequent clock changes:

    SNTP/5/NTP_CLOCK_CHANGE: System clock changed from ...

    Comware 7.1.045, Feature 2428 is installed on the switches. The NTP configuration is as follows:

     clock protocol ntp
     sntp enable
     sntp unicast-server 10.0.0.1 source Vlan-interface100
     sntp unicast-server 10.0.0.2 source Vlan-interface100

    Both IP addresses being our Windows Domain Controllers. Any ideas why I see this repeated clock changes?


    #NTP


  • 2.  RE: Frequent clock changes

    MVP GURU
    Posted Oct 10, 2017 06:09 AM

    What are the outputs of

    display ntp-service sessions

    and

    display ntp-service status

    commands executed on your IRF stack?



  • 3.  RE: Frequent clock changes

    Posted Oct 10, 2017 11:22 AM

    <SWITCH>display ntp-service sessions
    <SWITCH>display ntp-service status
     Clock status: unsynchronized
     Clock stratum: 16
     Reference clock ID: none
    <SWITCH>display sntp sessions
    SNTP server     Stratum   Version    Last receive time
    10.0.0.1        5         4          Tue, Oct 10 2017 17:20:03.181
    10.0.0.2        4         4          Tue, Oct 10 2017 17:20:02.179 (Synced)



  • 4.  RE: Frequent clock changes

    MVP GURU
    Posted Oct 10, 2017 05:40 PM

    Just curious, can you provide us results of:

    display current-configuration | include ntp

    and

    display clock

    and

    display ntp-service trace

    and

    timesync sntp

    commands



  • 5.  RE: Frequent clock changes

    Posted Oct 12, 2017 11:35 AM

    <SWITCH>display current-configuration | include ntp
     clock protocol ntp
     sntp enable
     sntp unicast-server 10.0.0.1 source Vlan-interface100
     sntp unicast-server 10.0.0.2 source Vlan-interface100
    <SWITCH>display clock
    17:30:40 MEST Thu 10/12/2017
    Time Zone : MET add 01:00:00
    Summer Time : MEST 02:00:00 March last Sunday 03:00:00 October last Sunday 01:00:00
    <SWITCH>display ntp-service trace
    Local host: Not synchronized.

    There is no "timesync" command.



  • 6.  RE: Frequent clock changes

    EMPLOYEE
    Posted Oct 18, 2017 03:04 PM

    Leonardo,

    Stratus 4 and 5 servers are less accurate time servers.  We always like to see peers that are closer to the Atomic Clock than that. 

    Are the servers that 10.0.0.1 and 2 using stable?  Are the Moonshot switches within a reasonable delta from the NTP servers?  If more than a few seconds difference, you should manually set the clocks to be closer to the correct time before you enable NTP again.  NTP doesn't make large time swings.  You have to get it there first and then NTP will deal with the fluctuations.

    Regards,

    David