Juniper JUNOSE 11.3, Configuration Manual

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•
Use to assign an NTP server to the system and to customize the way the server
communicates with the system.
•
Specify the source option to direct responses from the NTP server to a specific interface
on the system and override the ntp source command.
•
Example
host1(config)# ntp server 192.35.42.1 version 3 prefer source atm 3/0.1
•
Use the no version to terminate communications between the system and an NTP
server.
•
See ntp server.
ping
•
Use to check that the system can reach an NTP server.
•
Example
host1(config)# ping 192.35.42.1
•
There is no no version.
•
See ping.
Directing Responses from NTP Servers
By default, an NTP server sends a response to the interface from which an NTP request
originated. You can now direct responses from all NTP servers to one interface on the
system or direct responses from a specific NTP server to a specific interface.
ntp source
•
Use to direct responses from all NTP servers to a specific interface. Using the source
option with the ntp server command overrides the ntp source command.
•
Example
host1(config)# ntp source atm 3/1
•
Use the no version to direct all servers to reply to the interface from which the NTP
request was sent (the default setting).
•
See ntp source.
Refusing Broadcasts from NTP Servers
You can prevent the system from receiving certain types of broadcasts and specify the
servers from which the system will accept NTP broadcasts. To do so:
1.
Issue the ntp access-group command.
2.
Configure an access list.
access-list
515 Copyright © 2010, Juniper Networks, Inc.
Chapter 10: Configuring the System Clock