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Cisco IOS in a Nutshell, 2nd Edition by James Boney

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Name

ntp master — global

Synopsis

ntp master stratum
no ntp master stratum

Configures

Network Time Protocol (NTP) service

Default

The router is not a master

Description

This command configures the router as the master NTP server from which other NTP peers can receive their NTP time. (See the ntp peer command for setting peer values.) This command should be used with extreme caution, as it can declare the router’s clock to be stratum 1 (most accurate) without any safeguards about how accurate the clock really is.

stratum

The NTP stratum number for this server. The value can be 1 through 15.

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