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    Configuring NTP Servers and Time Zones

    Use this procedure to specify the NTP servers that the system will use, and to set the time zone.

    Note: We recommend that you always use NTP servers for the system time. If you are unable to use NTP servers, you can set the time manually using the procedure in Setting the Date and Time.

    Note: If the NTP server provides a reference time that is different from the local system time, the local system clock is changed gradually to match the reference clock. For larger time differences, the local system clock might take an hour or more to finish synchronizing with the reference clock. For even larger time differences, the local system clock might not synchronize at all. This is standard NTP behavior.

    Note: Changing the time affects PMs. For more information, see Effect Of a Time Change on PMs.

    1. Enter system configuration mode.

      For example:

      bti7800# config
      Entering configuration mode terminal 
      bti7800(config)# system 
    2. Add the list of NTP servers that you want the system to use.

      For example:

      bti7800(config-system)# ntp server

      The NTP servers are placed on the server list in the order that you add them.

    3. Set the time zone.

      For example:

      bti7800(config-system)# clock timezone-location America/New_York
    4. Commit your changes.
      bti7800(config-system)# commit
    5. Verify your settings by displaying the new settings.

      For example:

      bti7800(config-system)# do show system ntp
           remote           refid      st t when poll reach   delay   offset  jitter 
      ==============================================================================          2 u   16   64    1   57.721    2.958   0.000         2 u   15   64    1   38.271   -4.293   0.000  
      bti7800(config-system)# do show system clock 
      current-datetime          : 2015-01-23T16:44:18-05:00 
      boot-datetime             : 2015-01-22T23:58:05-05:00 
      uptime                    : 0 days,16:46:13  

      Note: The T delineates the date from the time. The time shown is the local time in the specified timezone. The timezone is indicated by the UTC offset, which in the above example is UTC-05:00.

    Modified: 2017-04-20