NTP Operational Commands

OSPF Show Commands

NTP Status

Displays the NTP status information.

Syntax:

show ntp status

supervisor@rtbrick>LEAF01: cfg> show ntp status
associd=0 status=0615 leap_none, sync_ntp, 1 event, clock_sync,
version="ntpd 4.2.8p12@1.3728-o (1)", processor="x86_64",
system="Linux/5.4.40-OpenNetworkLinux", leap=0, stratum=3,
precision=-23, rootdelay=8.000, rootdisp=22.954, refid=198.51.100.13,
reftime=0xebe02d40.3a7421ac  2025-05-27T12:23:28.228334+00:00,
clock=0xebe03159.0c75c3b2  2025-05-27T12:40:57.048671+00:00,peer=60555,
tc=9, mintc=3, offset=-0.167277, frequency=-8.965, sys_jitter=0.076656,
clk_jitter=0.105, clk_wander=0.019

NTP Peer

Displays history of the NTP peers, showing when they went up or down and any changes in their status, identified by the peer’s IP address.

Syntax:

show ntp peer <options>

Option	Description
<peer-ip>	IP address of the NTP peer to show history for.
history	Displays history of the NTP peers, showing when they went up or down and any changes in their status, identified by the peer’s IP address.
detail	Displays detailed information for a specific NTP peer, including its association ID, status, source address, port, hostname, destination address, leap indicator, stratum, precision, root delay, root dispersion, reference ID, reference time, receive time, reachability, host mode, peer mode, poll intervals, headway, key ID, offset, delay, dispersion, and jitter.
<peer-ip> history	Displays the history of a specific NTP peer.
<peer-ip> detail	Displays detailed information for a specific NTP peer.

Option

Description

<peer-ip>

IP address of the NTP peer to show history for.

history

Displays history of the NTP peers, showing when they went up or down and any changes in their status, identified by the peer’s IP address.

detail

Displays detailed information for a specific NTP peer, including its association ID, status, source address, port, hostname, destination address, leap indicator, stratum, precision, root delay, root dispersion, reference ID, reference time, receive time, reachability, host mode, peer mode, poll intervals, headway, key ID, offset, delay, dispersion, and jitter.

<peer-ip> history

Displays the history of a specific NTP peer.

<peer-ip> detail

Displays detailed information for a specific NTP peer.

The example below shows the history of a specific NTP peer, showing when it went up or down and any changes in its status.

supervisor@rtbrick>LEAF01: cfg> show ntp peer 198.51.100.13 history
srcadr               timestamp                                associd     status    reason
198.51.100.13        Tue May 27 10:15:27 GMT +0000 2025         60555       1414    Peer Up
198.51.100.13        Tue May 27 12:24:52 GMT +0000 2025         60555       161a    Selected as Best

The example below shows detailed information of the NTP peers using NTP Mode 6 control message READVAR, including their association ID, status, source address, port, hostname, destination address, leap indicator, stratum, precision, root delay, root dispersion, reference ID, reference time, receive time, reachability, host mode, peer mode, poll intervals, headway, key ID, offset, delay, dispersion, and jitter.

supervisor@rtbrick>LEAF01: cfg> show ntp peer detail
associd: 60555, status: 161a
  srcadr: 198.51.100.13, srcport: 123
  srchost: node-2.infogral.is
  dstadr: 198.51.100.101, Port: 123
  leap: 0 leap_none, stratum: 2, precision: -25
  rootdelay: 5.112
  rootdisp: 0.290
  refid: 192.0.2.4
  reftime: 2025-05-27T12:34:07.000003+0000
  rec: 2025-05-27T12:36:32.000003+0000
  reach: 336, unreach: 2
  hmode: 3 pmode: 4, hpoll: 9, ppoll: 9
  headway: 0, keyid: 0
  flash: 0 Ok
  offset: -0.198
  delay: 2.828
  dispersion: 16.124001
  jitter: 0.638
  xleave: 0.036000
<...>

NTP Associations

Displays the information about the various NTP servers configured.

Syntax:

show ntp association <options>

Option	Description
no-resolve	Details without DNS resolution.

Option

Description

no-resolve

Details without DNS resolution.

supervisor@rtbrick.net: op> show ntp association
Flags: * Synchronized, # Almost synchronized, + Selected for possible synchronization,"
       – Candidate for selection, ~ Statically configured"
Remote              Refid            St  T  When  Poll  Reach    Delay   Offset   Jitter
+194.50.19.117      131.188.3.222     2  u   522  1024    377    4.939    0.162    0.069
*193.203.3.171      .GPS.             1  u   897  1024    377    9.791    0.008    0.066
-51.75.67.47        157.13.205.54     3  u   770  1024    377    4.929   -0.110    0.149
+85.215.189.120     192.53.103.103    2  u   868  1024    377   13.483    0.043    0.181
-167.235.70.245     195.176.26.205    2  u   757  1024    377    0.883    0.158    0.332
-162.159.200.123    10.163.8.4        3  u   642  1024    377    4.160    0.439    0.484

Verifying NTP Service on Linux

To get more information about NTP’s status, use the ntpq command:

The command displays the NTP servers that the system is synchronized with.

supervisor@rtbrick>LEAF01:~ $ sudo ntpq -p
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
198.51.100.5       .XFAC.          16 u    -   64    0    0.000    0.000   0.000