Implementing NTP on Cisco IOS XR Software
How to Implement NTP on Cisco IOS XR Software
SMC-175
Cisco IOS XR System Management Configuration Guide
Configuring NTP Access Groups
This task explains how to configure NTP access groups.
Note No specific command enables NTP; the first NTP configuration command that you issue enables NTP.
NTP Access Groups
The access list-based restriction scheme allows you to grant or deny certain access privileges to an entire
network, a subnet within a network, or a host within a subnet.
The access group options are scanned in the following order, from least restrictive to most restrictive:
1. peer—Allows time requests and NTP control queries and allows the system to synchronize itself to
a system whose address passes the access list criteria.
2. serve—Allows time requests and NTP control queries, but does not allow the system to synchronize
itself to a system whose address passes the access list criteria.
3. serve-only—Allows only time requests from a system whose address passes the access list criteria.
4. query-only—Allows only NTP control queries from a system whose address passes the access list
criteria.
Step 6
broadcast [destination
ip-address
][key
key-id
]
[version
number
]
Example:
RP/0/RP0/CPU0:(config-ntp-int)# broadcast
destination 10.50.32.149
Configures the specified interface to send NTP broadcast
packets.
Step 7
end
or
commit
Example:
RP/0/RP0/CPU0:router(config)# end
or
RP/0/RP0/CPU0:router(config)# commit
Saves configuration changes.
• When you issue the end command, the system prompts
you to commit changes:
Uncommitted changes found, commit them before
exiting(yes/no/cancel)?
[cancel]:
–
Entering yes saves configuration changes to the
running configuration file, exits the configuration
session, and returns the router to EXEC mode.
–
Entering no exits the configuration session and
returns the router to EXEC mode without
committing the configuration changes.
–
Entering cancel leaves the router in the current
configuration session without exiting or
committing the configuration changes.
• Use the commit command to save the configuration
changes to the running configuration file and remain
within the configuration session.
Command or Action Purpose
