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Networking Fundamentals · Intermediate

NTP Stratum

The distance of an NTP server from an authoritative reference clock, from stratum 0 (the clock) to 15; stratum 16 means unsynchronized.

Definition

Stratum 0 devices are atomic clocks or GPS receivers, stratum 1 servers connect directly to them, and each additional hop adds one. Lower stratum indicates closer to the reference, not necessarily more accurate.

Example

show ntp status reporting stratum 3 means the device is two hops from a stratum 1 server.

Exam tip

Stratum 16 = not synchronized.

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