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Cisco IOS Software Configuration Guide for Cisco Aironet Access Points
OL-14209-01
Chapter 5 Administering the Access PointWireless Device Access
Managing the System Time and Date
You can configure SNTP to request and accept packets from configured servers or to accept NTP
broadcast packets from any source. When multiple sources are sending NTP packets, the server with the
best stratum is selected. Click this URL for more information on NTP and strata:
http://www.cisco.com/en/US/products/hw/switches/ps708/products_installation_and_configuration_gu
ides_list.html
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.
Table 5-4
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.
