Managing The System Time And Date; Understanding The System Clock; Understanding Network Time Protocol - Cisco C3201FESMIC-TP= - 3201 Fast EN Switch Mobile Interface Card Expansion Module Software Configuration Manual

Administering the WMIC
wmic1(config-if)#station-role root
Selected role requires Cisco Aironet Extension enabled.
Enabled Cisco Aironet Extension.
If you try to change the Aironet extensions without setting the radio to the proper role, an error message
displays:
wmic1(config-if)#
wmic1(config-if)#no dot11 extension aironet
Aironet Extension is always enabled in Bridge or WGB mode.

Managing the System Time and Date

You can manage the system time and date on your WMIC automatically, by using the Network Time
Protocol (NTP), or manually, by setting the time and date on the WMIC.
For complete syntax and usage information for the commands used in this section, see the Cisco IOS
Note
Configuration Fundamentals Command Reference for Release 12.2.

Understanding the System Clock

The heart of the time service is the system clock. This clock runs from the moment that the system starts
up. The system clock keeps track of the date and time.
The system clock can then be set from these sources:
•
•
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
Date Manually" section on page

Understanding Network Time Protocol

The NTP is designed to time-synchronize a network of devices. NTP is documented in RFC 1305.
An NTP network usually gets its time from an authoritative time source, such as a radio clock or an
atomic clock attached to a time server. NTP then distributes this time across the network. NTP is
extremely efficient; no more than one packet per minute is necessary to synchronize two devices to
within a millisecond of each other.
NTP uses the concept of a stratum to describe how many NTP hops away a device is from an
authoritative time source. A stratum 1 time server has a radio or atomic clock directly attached, a
stratum 2 time server receives its time through NTP from a stratum 1 time server, and so on.
Network Time Protocol
Manual configuration
44.
Cisco 3200 Series Wireless MIC Software Configuration Guide
Managing the System Time and Date
"Configuring Time and
41