Juniper SYSTEM BASICS - CONFIGURATION GUIDE V 11.1.X

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
■ Use to configure an access list.
■ Example
host1(config)#access-list europe permit any
■ Use the no version to remove the access list.
■ See access-list.
ntp access-group
NOTE: The system can accept, but does not use, NTP control queries.
■ Use to specify the types of broadcasts that the system will accept and respond
to, and to specify an access list of servers from which the system will accept
broadcasts.You can enable the system to:
■ Receive time requests, receive NTP control queries, and synchronize itself
to the servers specified on the access-list
■ Only receive time requests and NTP control queries from specified servers
■ Only receive time requests from specified servers
■ Only receive NTP control queries from specified servers
■ Example
host1(config-line)#ntp access-group peer europe
■ Use the no version to enable the system to receive all NTP broadcasts on
interfaces configured to receive broadcasts.
■ See ntp access-group.
NTP Server Configuration
To enable a virtual router to act as an NTP server:
1. Access the virtual router context.
2. Specify that the virtual router acts as an NTP server.
530 ■ NTP Configuration Tasks
JUNOSe 11.1.x System Basics Configuration Guide