JAEN

Cisco IOS

show ntp status

SafeNTP on network gear

show ntp status

Verifies clock sync — untrusted timestamps poison every investigation, so NTP health is foundational.

Examples

  • show ntp associationsPeers and reachability
  • show clock detailCurrent time and its source (NTP or not)
  • ntp server 192.168.1.1 preferSet a preferred server (config mode)
  • ntp source Vlan10Pin the NTP source interface (config mode)
  • clock timezone JST 9 0Set the time zone to JST (config mode)

Syntax

show ntp status / show ntp associations / (config)# ntp server <ip>

Key points

  • Clock is synchronized means synced; unsynchronized (or stratum 16) means not.
  • In associations, the line starting with * is the server currently synced to.
  • After a reload or with a large offset, syncing can take several minutes.

When it does not work

  • If it never syncs, check reachability to UDP 123, ACLs on the path and the source interface (ntp source).
  • A reach value stuck at 0 means no replies from that server.

Before you run it

Read only.

Related commands

You can carry a laptop to the rack. Signal will not follow.

Check syntax standing in front of the hardware, with no connection at all. The app keeps 1,510 commands and 120 fix flows on your device. Free to install, no ads (some content is a one-time purchase).

Get it free on the App Store