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Time incorrect 23 minutes ahead on Aruba 2930F - Using NTP

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  • 1.  Time incorrect 23 minutes ahead on Aruba 2930F - Using NTP

    Posted Aug 31, 2022 02:11 PM
    Hi all,

    I'm having some issues getting my switch to sync time from the NTP server on my domain. We recently migrated the server to another DC due to a FSMO role change. I'm using a 2930F configured with NTP synchronization located in Central Time Zone. The time is off by about 23 minutes and I can't figure out why it is off. I have redacted the time server IP, but all other workstations and servers are using the server successfully on the network.

    timesync ntp
    no sntp
    ntp unicast
    ntp server x.x.x.x iburst
    ntp enable
    time daylight-time-rule continental-us-and-canada
    time timezone -360

    The current time is 9:54am 8/31/2022 and my switch is showing 9:31am 8/31/2022

    CityHall-SW2# sh time
    Wed Aug 31 09:31:17 2022


    NTP Associations Entries
    Remote St T When Poll Reach Delay Offset Dispersion
    --------------- ---- ---- ------ ----- -------- -------- -------- ----------
    x.x.x.x 
     4 u 5143 10 37777... 0.001 1389.603 0.30809
    -My offset is showing 1389 seconds which is about 23 minutes of offset. I've read online that this offset will slowly be adjusted, however after 2 days there has been no change to the offset.

    NTP Status

    CityHall-SW2# sh ntp status

    NTP Status Information

    NTP Status : Enabled NTP Mode : Unicast
    Synchronization Status : Synchronized Peer Dispersion : 0.30809 sec
    Stratum Number : 16 Leap Direction : 0
    Reference Assoc ID : 1 Clock Offset : 1389.60332 sec
    Reference ID : x.x.x.x Root Delay : 0.03664 sec
    Precision : 2**-18 Root Dispersion : 1186.00820 sec
    NTP Up Time : 20d 18h 58m Time Resolution : 819 nsec
    Drift : 0.00000 sec/sec

    System Time : Wed Aug 31 09:35:01 2022
    Reference Time : Sun Apr 10 00:25:35 2022
    I am a rookie when it comes to configuring the NTP settings on an Aruba switch. Any advice would be truly appreciated as I'd like to get this configured on all of my switches correctly.



  • 2.  RE: Time incorrect 23 minutes ahead on Aruba 2930F - Using NTP

    MVP GURU
    Posted Sep 01, 2022 03:19 AM
    Hi!, Stratum, Clock Offset and Root Dispersion values look a little strange to me compared to ones I'm used to see.

    If I look at my NTP settings (very similar to your ones):

    timesync ntp
    ntp unicast
    ntp server 10.255.0.1 iburst
    ntp server 10.255.0.2 iburst
    ntp enable
    no telnet-server
    time daylight-time-rule western-europe
    time timezone 60

    the outcome from my local NTP Servers (two Linux instances running chrony service) this i what I obtain:

    switch# show ntp status

    NTP Status Information

    NTP Status             : Enabled         NTP Mode        : Unicast
    Synchronization Status : Synchronized    Peer Dispersion : 0.00000 sec
    Stratum Number         : 3               Leap Direction  : 0
    Reference Assoc ID     : 0               Clock Offset    : 0.35887 sec
    Reference ID           : 10.255.0.1      Root Delay      : 0.02804 sec
    Precision              : 2**-18          Root Dispersion : 0.91092 sec
    NTP Up Time            : 27d 14h 36m     Time Resolution : 819 nsec
    Drift                  : 0.00052 sec/sec

    System    Time : Thu Sep 1 09:07:14 2022
    Reference Time : Thu Sep 1 07:59:20 2022

    with these associations:

    switch# show ntp associations

    NTP Associations Entries

    Remote          St   T    When   Poll  Reach    Delay    Offset   Dispersion
    --------------- ---- ---- ------ ----- -------- -------- -------- ----------
    10.255.0.1      2    u    238... 10    17       0.000    0.000    16.00000
    10.255.0.2      3    u    238... 10    17       0.000    0.000    16.00000

    What is the software version running on your Aruba 2930F switch?
    Original Message


  • 3.  RE: Time incorrect 23 minutes ahead on Aruba 2930F - Using NTP

    Posted Sep 02, 2022 09:07 AM

    Here is the version that this switch is currently running. 

    CityHall-SW2# sh version
Image stamp:
 /ws/swbuildm/rel_spokane_qaoff/code/build/lvm(swbuildm_rel_spokane_qaoff_rel_sp
okane)
                Oct 26 2016 11:24:18
                WC.16.02.0014
                281
Boot Image:     Primary

Boot ROM Version:    WC.16.01.0003
Active Boot ROM:     Primary
​

    Original Message