Cisco Systems 0L-11350-01 Configuring SNTP, Configuring Time and Date Manually

5-28
Cisco IOS Software Configuration Guide for Cisco Aironet Access Points
OL-11350-01
Chapter5 Administering the Access PointW ireless Device Access
Managing the System Time and Date
http://www.cisco.com/en/US/tech/tk648/tk362/technologies_tech_note09186a0080a23d02.shtml
If multiple servers are at the same stratum, a configured server is preferred over a broadcast server. If
multiple servers pass both tests, the first one to send a time packet is selected. SNTP will only choose a
new server if it stops receiving packets from the currently selected server, or if a better server (according
to the above criteria) is discovered.
Configuring SNTP
SNTP is disabled by default. To enable SNTP on the access point, use one or both of these commands
in global configuration mode:
Enter the sntp server command once for each NTP server. The NTP servers must be configured to
respond to the SNTP messages from the access point.
If you enter both the sntp server command and the sntp broadcast client command, the access point
will accept time from a broadcast server but prefers time from a configured server, assuming the strata
are equal. To display information about SNTP, use the show sntp EXEC command.
Configuring Time and Date Manually
If no other source of time is available, you can manually configure the time and date after the system is
restarted. The time remains accurate until the next system restart. Cisco recommends that you use
manual configuration only as a last resort. If you have an outside source to which the wireless device can
synchronize, you do not need to manually set the system clock.
This section contains this configuration information:
•Setting the System Clock, page 5-28
•Displaying the Time and Date Configuration, page 5-29
•Configuring the Time Zone, page 5-29
•Configuring Summer Time (Daylight Saving Time), page 5-30
Setting the System Clock
If you have an outside source on the network that provides time services, such as an NTP server, you do
not need to manually set the system clock.
Table5-4 SNTP Commands
Command Purpose
sntp server {address | hostname}
[version number]
Configures SNTP to request NTP packets from an
NTP server.
sntp broadcast client Configures SNTP to accept NTP packets from any
NTP broadcast server.