配置和驗證AP功率

1、針對自主AP（Autonomous AP）

使用'power local'配置命令配置AP或Bridge Radio功率級別。
在2.4 GHz，802.11g Radio上，您可以設置正交頻分復用（Orthogonal Frequency Division Multiplexing，OFDM）功率電平和互補代碼鍵控（Complementary Code Keying，CCK）功率電平。 802.11b和802.11g設備支持CCK調制。 802.11g和802.11a設備支持OFDM調制。

2.4-GHz Access Point Radio (802.11b)

power local {1 | 5 | 20 | 30 | 50 | 100 | maximum}

2.4-GHz Access Point Radio (802.11g)

power local cck {1 | 5 | 10 | 20 | 30 | 50 | 100 | maximum}
power local cck {-1 | 2 | 5 | 8 | 11 | 14 | 15 | 17 | 20 | maximum}
power local ofdm {1 | 5 | 10 | 20 | 30 | maximum}
power local ofdm {-1 | 2 | 5 | 8 | 11 | 14 | 17 | maximum}

5-GHz Access Point Radio (801.11a)

power local {5 | 10 | 20 | 40 | maximum}
power local { -1 | 2 | 5 | 8 | 11 | 14 | 15 | maximum}
power local { -1 | 2 | 5 | 8 | 11 | 14 | 15 | 17 | maximum}

1400 Series Bridge 5.8-GHz Radio

power local {12 | 15 | 18 | 21 | 22 | 23 | 24 | maximum}
This example shows how to specify a 20-mW transmit power level for the 802.11b access point radio:

AP(config-if)# power local 20

驗證傳輸功率：

使用'show controller dot11Radio'命令。 如下是一個例子。
此示例顯示如何顯示Radio 0接口的Radio Controller狀態：

AP# show controllers dot11radio 0

此命令的一部分輸出按速率顯示有效功率電平，如下所示：

1.0 to 11.0  , 20  dBm, changed due to regulatory maximum
6.0 to m15.  , 17  dBm, changed due to regulatory maximum
m0.-4 to m15.-4, 14  dBm, changed due to regulatory maximum

-4表示40MHz寬帶。 類似的輸出，-4s意味着40MHz寬帶，短保護間隔開啟。

 

 

2、CUWN中配置AP的傳輸功率

要配置802.11網絡中所有AP或單個AP的發射功率電平，請使用“config 802.11 txPower”命令。

config 802.11{a | b} txPower {global [auto | once | power_level]} config 802.11{a | b} txPower {ap ap_name [global | power_level]} 

此示例顯示如何為所有LAP手動將802.11b Radio發射功率設置為5級：

 

> config 802.11b txPower global 5

此示例顯示如何顯示802.11b傳輸功率開銷的配置和統計信息：

> show advanced 802.11b txpower Automatic Transmit Power Assignment Transmit Power Assignment Mode.................. AUTO Transmit Power Update Interval.................. 600 seconds Transmit Power Threshold........................ -65 dBm Transmit Power Neighbor Count................... 3 APs Transmit Power Update Contribution.............. SN. Transmit Power Assignment Leader................ xx:xx:xx:xx:xx:xx Last Run........................................ 384 seconds ago

3、配置Radio傳輸功率

從特權EXEC模式開始，請按照以下步驟設置AP Radio的發射功率：

Step 1	configure terminal	Enter global configuration mode.
Step 2	interface dot11radio { 0 | 1 }	Enter interface configuration mode for the radio interface. The 2.4-GHz radio is radio 0, and the 5-GHz radio is radio 1.
Step 3	power local These options are available for the 802.11b, 2.4-GHz radio:{ 1 | 5 | 20 | 30 | 50 | 100 | maximum }These options are available for the 5-GHz radio:{ 5 | 10 | 20 | 40 | maximum }	Set the transmit power for the 802.11b, 2.4-GHz radio or the 5-GHz radio to one of the power levels allowed in your regulatory domain. All settings are in mW. Note The settings allowed in your regulatory domain might differ from the settings listed here.
Step 4	power localThese options are available for the 802.11g, 2.4-GHz radio:power local cck settings:{ 1 | 5 | 10 | 20 | 30 | 50 | 100 | maximum }power local ofdm settings:{ 1 | 5 | 10 | 20 | 30 | maximum }	Set the transmit power for the 802.11g, 2.4-GHz radio to one of the power levels allowed in your regulatory domain. All settings are in mW.On the 2.4-GHz, 802.11g radio, you can set Orthogonal Frequency Division Multiplexing (OFDM) power levels and Complementary Code Keying (CCK) power levels. CCK modulation is supported by 802.11b and 802.11g devices. OFDM modulation is supported by 802.11g and 802.11a devices. Note The settings allowed in your regulatory domain might differ from the settings listed here. Note The 802.11g radio transmits at up to 100 mW for the 1, 2, 5.5, and 11Mbps data rates. However, for the 6, 9, 12, 18, 24, 36, 48, and 54Mbps data rates, the maximum transmit power for the 802.11g radio is 30 mW.
Step 5	end	Return to privileged EXEC mode
Step 6	copy running-config startup-config	(Optional) Save your entries in the configuration file.

使用no形式的power命令將電源設置恢復為最大值，即默認設置。

4、AIR-RM21A / AIR-RM22A無線電模塊通常設置為最大發射功率

AIR-RM21A和AIR-RM22A Radio模塊以分貝每毫瓦（dBm）測量發射功率，但Cisco Aironet AP中早期版本的802.11a無線電以毫瓦（mW）為單位測量功率。 由於mW的功率設置不直接轉換為dBm設置，因此在安裝新的AIR-RM21A或AIR-RM22A無線電模塊時，AP通常使用默認功率設置。

表中列出了以mW為單位的802.11a傳輸功率設置以及接入點分配給新無線電模塊的功率設置。

5	5 dBm (approximately 3 mW)
10	maximum (17 dBm)
20	maximum
40	maximum

5、限制關聯的客戶端的Power Level

你還可以限制與AP關聯的客戶端設備上的功率級別。 當客戶端設備關聯到AP時，AP將最大功率電平設置發送到客戶端。
從特權EXEC模式開始，請按照以下步驟在與AP關聯的所有客戶端設備上指定最大允許功率設置：

Step 1	configure terminal	Enter global configuration mode.
Step 2	interface dot11radio { 0 | 1 }	Enter interface configuration mode for the radio interface. The 2.4-GHz radio is radio 0, and the 5-GHz radio is radio 1.
Step 3	power clientThese options are available for 802.11b, 2.4-GHz clients:{ 1 | 5 | 20 | 30 | 50 | 100 | maximum}These options are available for 802.11g, 2.4-GHz clients:{ 1 | 5 | 10 | 20 | 30 | 50 | 100 | maximum}These options are available for 5-GHz clients:{ 5 | 10 | 20 | 40 | maximum }	Set the maximum power level allowed on client devices that associate to the access point. All settings are in mW. Note The settings allowed in your regulatory domain might differ from the settings listed here.
Step 4	end	Return to privileged EXEC mode.
Step 5	copy running-config startup-config	(Optional) Save your entries in the configuration file.

使用no形式的client power命令禁用關聯客戶端的最大功率級別。
注意必須啟用Aironet擴展以限制關聯客戶端設備的功率級別。 默認情況下啟用Aironet擴展。

 

https://community.cisco.com/t5/wireless-mobility-documents/how-to-configure-and-verify-the-transmitted-power-level-on-aps/ta-p/3107653