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

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Name

ntp access-group — global

Synopsis

ntp access-group [condition] access-list
no ntp access-group [condition] access-list

Configures

Network Time Protocol (NTP) service

Default

None

Description

This command applies an access list to the router’s NTP service.

condition

Optional. Specifies the type of NTP queries to which the access list applies. Valid values are query-only, serve-only, serve, and peer. query-only allows NTP control requests only; serve-only allows time requests only; serve allows time requests and NTP control requests, but does not allow the router to synchronize its time with another NTP peer; peer allows time requests, NTP control requests, and time synchronization with other NTP peers. If this keyword is omitted, the access list applies to all queries.

access-list

A standard access list to be applied to NTP connections.

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