The Radio0-802.11A/B Settings are applicable to the 1100 and 1200 IOS APs.
The 802.11B configuration page is shown in Figure
, while the
802.11A is shown in Figure
. Many of
the IOS configuration tasks as settings can be applied in VxWorks
.
If the
Enable Radio is enabled, the access point sends packets through its
802.11a/b radio interface and monitors when other devices use the 802.11a/b
radio interface to send packets. To change the administrative state of the
Radio from up to down, choose Disable. To change the administrative state of
the radio from down to up, choose Enable.
The Current Status Software
indicates whether the interface has been enabled or disabled by the user. The
Current Status Hardware indicates whether the line protocol for the interface
is up or down.
The Role in Radio Network is where the role of the access
point can be selected. Choose one of the three access point (root) settings if
the access point is connected to the wired LAN
.
Use the
Data Rates setting to choose the data transmission rates. The rates are
expressed in megabits per second. The device always attempts to transmit at the
highest rate selected. If there are obstacles or interference, the device steps
down to the highest rate that enables data transmission. For each of the rates,
choose Require, Enable, or Disable
.
The
Transmit Power (mW) setting determines the power level of the radio
transmission. The default power setting is the highest transmit power allowed
in a regulatory domain. Government regulations define the highest allowable
power level for radio devices. This setting must conform to established
standards for the country in which the device is used. To reduce interference,
limit the range of the access point, or conserve power, select a lower power
setting.
Use the Limit Client Power (mw) to set the maximum power level
allowed on client devices that associate to the access point. When a client
device associates to the access point, the access point sends the maximum power
level setting to the client. All settings are in mw.
Use the Default
Radio Channel to define the channel. The available selection of radio channels
are determined by the regulatory domain. The default setting is the least
congested frequency. With this setting, the device scans for the radio channel
that is least busy and selects that channel for use. The device scans at
power-up and when the radio settings are changed. A specific channel setting
can be selected from the Default Radio Channel drop-down menu.
The Least
Congested Channel Search selection list is available only when the Default
Radio Channel is set to the Least Congested Frequency. By default, all channels
are selected and searched. To select more than one channel, hold down the Ctrl
or Shift keys to highlight multiple channels.
When enabling World Mode
Multi-Domain Operation (802.11B only), the device adds channel carrier set
information to its beacon. Client devices with world-mode enabled receive the
carrier set information and adjust their settings automatically.
The
Radio Preamble (802.11B only) is a section of data at the head of a packet that
contains information the access point and the client devices need when sending
and receiving packets. Keep the setting on short unless there is a need to test
with long preambles. If the radio preamble is set to short and a client that
does not support short preamble associates, the access point will only send
long preamble packets to this client
.
The
Receive Antenna and Transmit Antenna settings are shown in Figure
. These will be
covered more in depth in Module 7.
Select Enable to use Cisco Aironet
802.11 extensions. This setting must be set to Enable so that load balancing,
MIC, and TKIP can be used.
For the Ethernet Encapsulation Transform, choose 802.1H or RFC1042 to set
Ethernet encapsulation type. Data packets that are not 802.2 packets must be
formatted to 802.2 with 802.1H or RFC1042. Cisco Aironet equipment defaults to
using RFC1042 because it provides optimum interoperability
.
Normally, an access point treats a workgroup bridge as an infrastructure
device and not as a client. The access point uses the reliable multicast
protocol to ensure delivery of all multicast packets. The extra traffic caused
by reliable delivery limits the number of workgroup bridges that can be
associated. Using the Reliable Multicast to WGB setting, select Disable to
allow the workgroup bridge to be treated as a non-infrastructure device and
thus allow the maximum number of workgroup bridges to be associated.
Public Secure Packet Forwarding prevents exchange of unicast, broadcast, or
multicast traffic between protected ports. Choose Enable so the protected port
can be used for secure mode configuration. To prevent communication between
clients associated to different access points on the wireless LAN, protected
ports must be configured on the switch connected to the access point.
The Beacon Period is amount of time between beacons in Kilomicroseconds. One
Kusec equals 1024 microseconds.
The Data Beacon Rate (DTIM) setting,
always a multiple of the beacon period, determines how often the beacon
contains a delivery traffic indication message (DTIM). A traffic indication map
is present in every beacon. The DTIM tells power-save client devices that a
packet is waiting for them. If power save clients are active, the access point
buffers any multicast traffics and delivers them immediately after the DTIM
beacon. Power save nodes always wake for the DTIM beacons. The longer the time,
the more buffering the access point does, and the longer the multicasts are
delayed. If the beacon period is set at 100 (its default setting), and the data
beacon rate is set at 2 (its default setting), then the device sends a beacon
containing a DTIM every 200 Kusec.
Packet settings are shown in Figure
. Advanced Repeater settings are shown in Figure
.