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Cisco Aironet 1100 Series Access Point Installation and Configuration Guide
OL-2851-01
Chapter 6 Administering the Access Point
Managing the System Time and Date
Note The SSH feature in this software release does not support IP Security (IPSec).
Configuring SSH
Before configuring SSH, download the crypto software image from Cisco.com. For more information,
refer to the release notes for this release.
For information about configuring SSH and displaying SSH settings, refer to the “Configuring Secure
Shell” section in the Cisco IOS Security Configuration Guide for Release 12.2.
Managing the System Time and Date
You can manage the system time and date on your access point automatically, using the Network Time
Protocol (NTP), or manually, by setting the time and date on the access point.
Note For complete syntax and usage information for the commands used in this section, refer to the Cisco IOS
Configuration Fundamentals Command Reference for Release 12.2.
This section contains this configuration information:
• Understanding the System Clock, page 6-14
• Understanding Network Time Protocol, page 6-15
• Configuring NTP, page 6-16
• Configuring Time and Date Manually, page 6-24
Understanding the System Clock
The heart of the time service is the system clock. This clock runs from the moment the system starts up
and keeps track of the date and time.
The system clock can then be set from these sources:
• Network Time Protocol
• Manual configuration
The system clock can provide time to these services:
• User show commands
• Logging and debugging messages
The system clock determines time internally based on Universal Time Coordinated (UTC), also known
as Greenwich Mean Time (GMT). You can configure information about the local time zone and summer
time (daylight saving time) so that the time is correctly displayed for the local time zone.
The system clock keeps track of whether the time is authoritative or not (that is, whether it has been set
by a time source considered to be authoritative). If it is not authoritative, the time is available only for
display purposes and is not redistributed. For configuration information, see the “Configuring Time and
Date Manually” section on page 6-24.
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