NTP configuration and verification on Junos# 

lab@vSRX> show configuration system | find ntp 
ntp {
    server 172.25.11.254;
}

lab@vSRX> show configuration system | find zone 
time-zone Europe/Berlin;
syslog {
    file interactive-commands {
        interactive-commands any;
    }
    file messages {
        any any;
        authorization info;
    }
}
license {
    autoupdate {
        url https://ae1.juniper.net/junos/key_retrieval;
    }
}
ntp {
    server 172.25.11.254;
}

lab@vSRX>

Then I instruct Junos to sync its date and time with the NTP server. Note that the set date ntp is executed at the operational mode:

lab@vSRX> set date ntp 
27 Aug 14:53:17 ntpdate[41191]: step time server 172.25.11.254 offset +0.000689 sec

lab@vSRX>

To verify that date and time have been successfully synchronized with the NTP server:

lab@vSRX> show ntp associations 
     remote               refid           auth  st  t  when  poll reach  delay     of
fset   jitter rootdelay rootdisp
=====================================================================================
================================
*172.25.11.254          10.210.8.72          -   3  u    63    64  177    0.378    +0
.299    1.960   12.161   54.642

lab@vSRX> 

lab@vSRX> show system uptime 
Current time: 2026-08-27 15:01:28 CEST
Time Source:  NTP CLOCK 
System booted: 2026-08-27 05:26:19 CEST (09:35:09 ago)
Protocols started: 2026-08-27 05:27:16 CEST (09:34:12 ago)
Last configured: 2026-08-27 14:51:52 CEST (00:09:36 ago) by lab
 3:01PM  up 9:35, 1 users, load averages: 3.12, 2.61, 2.57

lab@vSRX>

NTP configuration and debugging on Cisco Catalyst 6500 series#

Situation

  • 6500 switch is the corporate NTP server
  • Server team wants to synchronize Active Directory time with the NTP server. Troubleshooting
  • enable NTP debugs: enable NTP debugs
  • check logs on the 6500 switch: check logs