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Configuring the NTP Time Server and Time Services
When configuring NTP, you can specify which system
on the network is the authoritative time source, or time server, and
how time is synchronized between systems on the network. To do this,
you configure the router to operate in one of the following modes:
- Client mode—In this mode, the local router can be
synchronized with the remote system, but the remote system can never
be synchronized with the local router.
- Symmetric active mode—In this mode, the local router
and the remote system can synchronize with each other. You use this
mode in a network in which either the local router or the remote system
might be a better source of time.
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Note:
Symmetric active mode can be initiated by either
the local or the remote system. Only one system needs to be configured
to do so. This means that the local system can synchronize with any
system that offers symmetric active mode without any configuration
whatsoever. However, we strongly encourage you to configure authentication
to ensure that the local system synchronizes only with known time
servers.
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- Broadcast mode—In this mode, the local router sends
periodic broadcast messages to a client population at the specified
broadcast or multicast address. Normally,
you include this statement only when the local router is operating
as a transmitter.
- Server mode—In this mode, the local router operates
as an NTP server.
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Note:
In NTP server mode, the JUNOS software does not
support authentication.
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The following sections describe how to configure
these modes of operation:
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