Step 1 |
Disable the radio of a particular access point on the 802.11a/n/ac or 802.11b/g/n network by entering this command:
config {802.11a | 802.11b} disable Cisco_AP
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Step 2 |
Configure the channel width for a particular access point by entering this command:
config {802.11a | 802.11b} chan_width
Cisco_AP {20 | 40 | 80}
where
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20 allows the radio to communicate using only 20-MHz channels. Choose this option for legacy 802.11a radios, 20-MHz 802.11n
radios, or 40-MHz 802.11n radios that you want to operate using only 20-MHz channels. This is the default value.
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40 allows 40-MHz 802.11n radios to communicate using two adjacent 20-MHz channels bonded together. The radio uses the primary
channel that you choose as well as its extension channel for faster throughput. Each channel has only one extension channel
(36 and 40 are a pair, 44 and 48 are a pair, and so on). For example, if you choose a primary channel of 44, the Cisco WLC
would use channel 48 as the extension channel. If you choose a primary channel of 48, the Cisco WLC would use channel 44 as
the extension channel.
Note
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This parameter can be configured only if the primary channel is statically assigned.
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Note
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Statically configuring an AP’s radio for one of the available modes overrides the globally configured DCA channel width setting
(configured using the config advanced 802.11a channel dca chan-width-11n {20 | 40 | 80} command). If you ever change the static configuration back to global on the access point radio, the global DCA configuration
overrides the channel width configuration that the access point was previously using. It can take up to 30 minutes (depending
on how often DCA is configured to run) for the change to take effect.
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80 sets the channel width for the 802.11ac radios to 80 MHz.
Note
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Channels 116, 120, 124, and 128 are not available in the U.S. and Canada for 40-MHz channel bonding.
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Note
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You should disable the operational and admin status of the slot 1 and slot 2 on the Cisco Aironet 3600 Series APs with 802.11
ac module before changing the channel width using the config 802.11 {a | b} chan_width ap
ap-name
channel command. We recommend that you use the config 802.11 {a | b} disable ap command to disable the operational and admin status.
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Step 3 |
Enable or disable the use of specific antennas for a particular access point by entering this command:
config {802.11a | 802.11b} 11nsupport antenna {tx | rx} Cisco_AP {A | B | C} {enable | disable}
where A, B, and C are antenna ports. A is the right antenna port, B is the left antenna port, and C is the center antenna
port. For example, to enable transmissions from the antenna in access point AP1’s antenna port C on the 802.11a network, you
would enter this command:
config 802.11a 11nsupport antenna tx AP1 C enable
Note
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You cannot enable or disable individual antennas for 802.11ac because the 802.11ac module antennas are internal.
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Step 4 |
Specify the external antenna gain, which is a measure of an external antenna’s ability to direct or focus radio energy over
a region of space entering this command:
config {802.11a | 802.11b} antenna extAntGain
antenna_gain
Cisco_AP
High-gain antennas have a more focused radiation pattern in a specific direction. The antenna gain is measured in 0.5 dBi
units, and the default value is 7 times 0.5 dBi, or 3.5 dBi.
If you have a high-gain antenna, enter a value that is twice the actual dBi value (see Cisco Aironet Antenna Reference Guide for antenna dBi values). Otherwise, enter 0. For example, if your antenna has a 4.4-dBi gain, multiply the 4.4 dBi by 2 to
get 8.8 and then round down to enter only the whole number (8). The Cisco WLC reduces the actual equivalent isotropic radiated
power (EIRP) to make sure that the antenna does not violate your country’s regulations.
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Step 5 |
Configure beamforming for the 5-GHz radios for all APs or a specific by entering this command:
config 802.11a {global | ap
ap-name} {enable | disable}
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Step 6 |
Specify the channel that a particular access point is to use by entering this command:
config {802.11a | 802.11b} channel ap Cisco_AP channe l
For example, to configure 802.11a channel 36 as the default channel on AP1, enter the
config 802.11a channel ap AP1 36 command.
The channel you choose is the primary channel (for example, channel 36), which is used for communication by legacy 802.11a
radios and 802.11n 20-MHz radios. 802.11n 40-MHz radios use this channel as the primary channel but also use an additional
bonded extension channel for faster throughput, if you chose 40 for the channel width.
Note
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Changing the operating channel causes the access point radio to reset.
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Step 7 |
Specify the transmit power level that a particular access point is to use by entering this command:
config {802.11a | 802.11b} txPower ap Cisco_AP power_level
For example, to set the transmit power for 802.11a AP1 to power level 2, enter the
config 802.11a txPower ap AP1 2 command.
The transmit power level is assigned an integer value instead of a value in mW or dBm. The integer corresponds to a power
level that varies depending on the regulatory domain in which the access points are deployed. The number of available power
levels varies based on the access point model. However, power level 1 is always the maximum power level allowed per country
code setting, with each successive power level representing 50% of the previous power level. For example, 1 = maximum power
level in a particular regulatory domain, 2 = 50% power, 3 = 25% power, 4 = 12.5% power, and so on.
In certain cases, Cisco access points support only 7 power levels for certain channels, so that the Cisco Wireless Controller
considers the 7th and 8th power levels as the same. If the 8th power level is configured on those channels, the configuration
would fail since the controller considers the 7th power level as the lowest acceptable valid power level. These power values
are derived based on the regulatory compliance limits and minimum hardware limitation which varies across different Cisco
access points. For example, Cisco 3500, 1140, and 1250 series access points allow the configuration of last power levels because those access
points report the "per path power" to the controller, whereas all next generation acess points such as Cisco 3700, 3600, 2600,
and 1600 series access points report "total power value" to the controller, thereby decreasing the allowed power levels for
newer generation products. For example, if the last power level in the 3600E access point has a power value of 4dbm (total
power), then it actually means the power value is -2dbm (per path).
Note
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See the hardware installation guide for your access point for the maximum transmit power levels supported per regulatory domain.
Also, see data sheet for your access point for the number of power levels supported.
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Step 8 |
Save your settings by entering this command:
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Step 9 |
Repeat Step 2 through Step 7 for each access point radio for which you want to assign a static channel and power level.
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Step 10 |
Reenable the access point radio by entering this command:
config {802.11a | 802.11b} enable Cisco_AP
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Step 11 |
Have the Cisco WLC send the access point radio admin state immediately to WCS by entering this command:
config {802.11a | 802.11b} enable network
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Step 12 |
Save your changes by entering this command:
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Step 13 |
See the configuration of a particular access point by entering this command:
show ap config {802.11a | 802.11b} Cisco_AP
Information similar to the following appears:
Cisco AP Identifier.............................. 7
Cisco AP Name.................................... AP1
...
Tx Power
Num Of Supported Power Levels ............. 8
Tx Power Level 1 .......................... 20 dBm
Tx Power Level 2 .......................... 17 dBm
Tx Power Level 3 .......................... 14 dBm
Tx Power Level 4 .......................... 11 dBm
Tx Power Level 5 .......................... 8 dBm
Tx Power Level 6 .......................... 5 dBm
Tx Power Level 7 .......................... 2 dBm
Tx Power Level 8 .......................... -1 dBm
Tx Power Configuration .................... CUSTOMIZED
Current Tx Power Level .................... 1
Phy OFDM parameters
Configuration ............................. CUSTOMIZED
Current Channel ........................... 36
Extension Channel ......................... 40
Channel Width.............................. 40 Mhz
Allowed Channel List....................... 36,44,52,60,100,108,116,132,
......................................... 149,157
TI Threshold .............................. -50
Antenna Type............................... EXTERNAL_ANTENNA
External Antenna Gain (in .5 dBi units).... 7
Diversity.................................. DIVERSITY_ENABLED
802.11n Antennas
Tx
A....................................... ENABLED
B....................................... ENABLED
Rx
A....................................... DISABLED
B....................................... DISABLED
C.................................... ENABLED
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