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NTP Server question

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  • 1.  NTP Server question

    Posted 08-21-2018 02:12

    Hi all,


    I need to configure one of our MX240 Routers as an NTP server for Internal devices to get their NTP settings from.


    Primarily, the devices requiring this will be the SRX300 and 340 series NTE devices. These devices are protected from the outside World by utilising address ranges that are not advertised through BGP. This causes an issue with being able to use the server0.europe.pool.ntp.org addresses as there is no resolution available.


    Does anyone know the best way to configure one of the MX240 routers to be an NTP Server please for these updates?

  • 2.  RE: NTP Server question

    Posted 08-21-2018 02:18

    Dumb question I guess....


    Can I just use the address of an MX router that has NTP already configured?

  • 3.  RE: NTP Server question
    Best Answer

    Posted 08-21-2018 02:23


    A JUNOS device can be an NTP server _IF_ it is synced to another NTP server itself.

    Otherwise it will relegate self to Stratum 16 server which cannot be used for time sync.

    No specific configuration is necessary EXCEPT for loopback filter to allow incoming NTP requests.




  • 4.  RE: NTP Server question

    Posted 08-21-2018 04:53

    Hi Alex,


    Thanks. That's exactly what I thought.


    Yes, the MX240 is already configured to sync with the European Time Servers, so all should be okay.