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The documentation set for this product strives to use bias-free language. For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. Learn more about how Cisco is using Inclusive Language.
Cisco CleanAir is a spectrum intelligence solution designed to proactively manage the challenges of a shared wireless spectrum. It allows you to see all of the users of the shared spectrum (both native devices and foreign interferers). It also enables you or your network to act upon this information. For example, you could manually remove the interfering device, or the system could automatically change the channel away from the interference.
A Cisco CleanAir system consists of CleanAir-enabled access points, controllers, and WCS. These access points collect information about all devices that operate in the industrial, scientific, and medical (ISM) bands, identify and evaluate the information as a potential interference source, and forward it to the controller. The controller controls the access points, collects spectrum data, and forwards information to WCS or a Cisco mobility services engine (MSE) upon request. The controller provides a local user interface to configure basic CleanAir features and display basic spectrum information. WCS provides an advanced user interface for configuring Cisco CleanAir features, displaying information, and keeping records. The MSE is optional for the basic feature set but required for advanced features such as tracking the location of non-Wi-Fi interference devices.
For every device operating in the unlicensed band, Cisco CleanAir tells you what it is, where it is, how it is impacting your wireless network, and what actions you or your network should take. It simplifies RF so that you do not have to be an RF expert.
Wireless LAN systems operate in unlicensed 2.4- and 5-GHz ISM bands. Many devices, such as microwave ovens, cordless phones, and Bluetooth devices also operate in these bands and can negatively affect Wi-Fi operations.
Some of the most advanced WLAN services, such as voice over wireless and IEEE 802.11n radio communications, could be significantly impaired by the interference caused by other legal users of the ISM bands. The integration of Cisco CleanAir functionality into the Cisco Unified Wireless Network addresses this problem of radio frequency (RF) interference.
The controller performs the following tasks in a Cisco CleanAir system:
Cisco CleanAir can detect interference, report on the location and severity of the interference, and recommend different mitigation strategies. Two such mitigation strategies are persistent device avoidance and spectrum event-driven RRM.
Wi-Fi chip-based RF management systems share these characteristics:
Cisco CleanAir is different and can positively identify not only the source of the noise but also its location and potential impact to a WLAN. Having this information allows you to consider the noise within the context of the network and make intelligent and, where possible, proactive decisions. For CleanAir, two types of interference events are common:
Persistent interference events are created by devices that are stationary in nature and have intermittent but largely repeatable patterns of interference. For example, consider the case of a microwave oven located in a break room. Such a device might be active for only 1 or 2 minutes at a time. When operating, however, it can be disruptive to the performance of the wireless network and associated clients. Using Cisco CleanAir, you can positively identify the device as a microwave oven rather than indiscriminate noise. You can also determine exactly which part of the band is affected by the device, and because you can locate it, you can understand which access points are most severely affected. You can then use this information to direct RRM in selecting a channel plan that avoids this source of interference for the access points within its range. Because this interference is not active for a large portion of the day, existing RF management applications might attempt to again change the channels of the affected access points. Persistent device avoidance is unique, however, in that it remains in effect as long as the source of interference is periodically detected to refresh the persistent status. The Cisco CleanAir system knows that the microwave oven exists and includes it in all future planning. If you move either the microwave oven or the surrounding access points, the algorithm updates RRM automatically.
Note Spectrum event-driven RRM can be triggered only by Cisco CleanAir-enabled access points in local mode.
Spontaneous interference is interference that appears suddenly on a network, perhaps jamming a channel or a range of channels completely. The Cisco CleanAir spectrum event-driven RRM feature allows you to set a threshold for air quality (AQ) that, if exceeded, triggers an immediate channel change for the affected access point. Most RF management systems can avoid interference, but this information takes time to propagate through the system. Cisco CleanAir relies on AQ measurements to continuously evaluate the spectrum and can trigger a move within 30 seconds. For example, if an access point detects interference from a video camera, it can recover by changing channels within 30 seconds of the camera becoming active. Cisco CleanAir also identifies and locates the source of interference so that more permanent mitigation of the device can be performed at a later time.
In the case of Bluetooth devices, Cisco CleanAir-enabled access points can detect and report interference only if the devices are actively transmitting. Bluetooth devices have extensive power save modes. For example, interference can be detected when data or voice is being streamed between the connected devices.
Some interference devices such as outdoor bridges and Microwave Ovens only transmit when needed. These devices can cause significant interference to the local WLAN due to short duration and periodic operation remain largely undetected by normal RF management metrics. With CleanAir the RRM DCA algorithm can detect, measure, register and remember the impact and adjust the DCA algorithm. This minimizes the use of channels affected by the persistent devices in the channel plan local to the interference source. Cisco CleanAir detects and stores the persistent device information in the controller and this information is used to mitigate interfering channels.
CleanAir-capable Monitor Mode access point collects information about persistent devices on all configured channels and store the information in controller. Local/Bridge mode AP detects interference devices on the serving channels only.
Persistent device information that is detected by local or monitor mode access points is propagated to the neighboring access points connected to the same controller. This provides better chance of handling and avoiding persistent devices. Persistent device detected by the CleanAir-enabled access point is propagated to neighboring non-CleanAir access points, which enhances channel selection quality.
Only Cisco CleanAir-enabled access points using the following access point modes can perform Cisco CleanAir spectrum monitoring:
The following options are available:
– DCA—Channel selection governed by the DCA list
– Country—All channel legal within a regulatory domain
Note Suppose you have two APs, one in the FlexConnect mode and the other in the monitor mode. Also suppose that you have created a profile enabling EAP attack against 802.1x auth. The Airmagnet (AM) tool, which can generate different types of attacks, fails to generate any attack even if you have provided valid AP MAC and STA MAC addresses. But if the AP MAC and STA MAC addresses in the AM tool are swapped, that is, the AP MAC address is specified in the STA MAC field and the STA MAC address is specified in the AP MAC field, then the tool is able to generate attacks, which the AP in the Monitor mode is also able to detect.
Note The access point does not participate in AQ HeatMap in WCS.
This section contains the following topics:
Step 1 Choose Wireless > 802.11a/n or 802.11b/g/n > CleanAir to open the 802.11a (or 802.11b) > CleanAir page.
Figure 14-1 802.11a (or 802.11b) > CleanAir
Step 2 Select the CleanAir check box to enable Cisco CleanAir functionality on the 802.11a/n or 802.11b/g/n network, or unselect it to prevent the controller from detecting spectrum interference. By default, the value is not selected.
Step 3 Select the Report Interferers check box to enable the Cisco CleanAir system to report any detected sources of interference, or unselect it to prevent the controller from reporting interferers. The default value is selected.
Note Device Security alarms, Event Driven RRM, and Persistence Device Avoidance algorithm do not work if Report Interferers are disabled.
Step 4 Select the Persistent Device Propagation check box to enable propagation of information about persistent devices that can be detected by CleanAir. Persistent device propagation enables you to propagate information about persistent devices to the neighboring access points connected to the same controller. Persistent interferers are present at a location and interfere with the WLAN operations even if they are not detectable at all times.
Step 5 Ensure that any sources of interference that need to be detected and reported by the Cisco CleanAir system appear in the Interferences to Detect box and any that do not need to be detected appear in the Interferences to Ignore box. Use the > and < buttons to move interference sources between these two boxes. By default, all interference sources are detected. The possible sources of interference that you can choose are as follows:
Note Access points that are associated to the controller send interference reports only for the interferers that appear in the Interferences to Detect box. This functionality allows you to filter out interferers that you do not want as well as any that may be flooding the network and causing performance problems for the controller or WCS. Filtering allows the system to resume normal performance levels.
Step 6 Configure Cisco CleanAir alarms as follows:
a. Select the Enable AQI (Air Quality Index) Trap check box to enable the triggering of air quality alarms, or unselect the box to disable this feature. The default value is selected.
b. If you selected the Enable AQI Trap check box in Select the Enable AQI (Air Quality Index) Trap check box to enable the triggering of air quality alarms, or unselect the box to disable this feature. The default value is selected., enter a value between 1 and 100 (inclusive) in the AQI Alarm Threshold text box to specify the threshold at which you want the air quality alarm to be triggered. When the air quality falls below the threshold level, the alarm is triggered. A value of 1 represents the worst air quality, and 100 represents the best. The default value is 35.
c. Select the Enable Interference Type Trap check box to trigger interferer alarms when the controller detects specified device types, or unselect it to disable this feature. The default value is selected.
d. Make sure that any sources of interference that need to trigger interferer alarms appear in the Trap on These Types box and any that do not need to trigger interferer alarms appear in the Do Not Trap on These Types box. Use the > and < buttons to move interference sources between these two boxes. By default, all interference sources trigger interferer alarms.
For example, if you want the controller to send an alarm when it detects a jamming device, select the Enable Interference Type Trap check box and move the jamming device to the Trap on These Types box.
Step 7 Click Apply to commit your changes.
Step 8 Trigger spectrum event-driven radio resource management (RRM) to run when a Cisco CleanAir-enabled access point detects a significant level of interference as follows:
a. Look at the EDRRM field to see the current status of spectrum event-driven RRM and, if enabled, the Sensitivity Threshold field to see the threshold level at which event-driven RRM is invoked.
b. If you want to change the current status of event-driven RRM or the sensitivity level, click Change Settings . The 802.11a (or 802.11b) > RRM > Dynamic Channel Assignment (DCA) page appears.
c. Select the EDRRM check box to trigger RRM to run when an access point detects a certain level of interference, or unselect it to disable this feature. The default value is selected.
d. If you selected the EDRRM check box in Select the EDRRM check box to trigger RRM to run when an access point detects a certain level of interference, or unselect it to disable this feature. The default value is selected., choose Low , Medium , High, or Custom from the Sensitivity Threshold drop-down list to specify the threshold at which you want RRM to be triggered. When the interference for the access point rises and the corresponding AQ index falls below the threshold level, RRM initiates a local channel assignment and changes the channel of the affected access point radio if possible to improve network performance. Low represents a decreased sensitivity to changes in the environment while High represents an increased sensitivity.
If you selected the EDRRM sensitivity threshold as custom, you must set a threshold value in the Custom Sensitivity Threshold field. The default sensitivity is 35.
The EDRRM AQ threshold value for low sensitivity is 35, medium sensitivity is 50, and high sensitivity is 60.
e. Click Apply to commit your changes.
Step 9 Click Save Configuration to save your changes.
Step 1 Configure Cisco CleanAir functionality on the 802.11a/n or 802.11b/g/n network by entering this command:
config {802.11a | 802.11b} cleanair {enable | disable} all
If you disable this feature, the controller does not receive any spectrum data. The default value is enable.
Step 2 Configure interference detection and specify sources of interference that need to be detected by the Cisco CleanAir system by entering this command:
config {802.11a | 802.11b} cleanair device {enable | disable} type
where you choose the type is one of the following:
Note Access points that are associated to the controller send interference reports only for the interference types specified in this command. This functionality allows you to filter out interferers that may be flooding the network and causing performance problems for the controller or WCS. Filtering allows the system to resume normal performance levels.
Step 3 Configure the triggering of air quality alarms by entering this command:
config {802.11a | 802.11b} cleanair alarm air-quality {enable | disable}
Step 4 Specify the threshold at which you want the air quality alarm to be triggered by entering this command:
config {802.11a | 802.11b} cleanair alarm air-quality threshold threshold
where threshold is a value between 1 and 100 (inclusive). When the air quality falls below the threshold level, the alarm is triggered. A value of 1 represents the worst air quality, and 100 represents the best. The default value is 35.
Step 5 Enable the triggering of interferer alarms by entering this command:
config {802.11a | 802.11b} cleanair alarm device {enable | disable}
Step 6 Specify sources of interference that trigger alarms by entering this command:
config {802.11a | 802.11b} cleanair alarm device type { enable | disable }
where you choose type as one of the following:
Step 7 Configure the triggering of air quality alarms for unclassified devices by entering this command:
config {802.11a | 802.11b} cleanair alarm unclassified { enable | disable }
Step 8 Specify the threshold at which you want the air quality alarm to be triggered for unclassified devices by entering this command:
config {802.11a | 802.11b} cleanair alarm unclassified threshold threshold
where threshold is a value from 1 and 99 (inclusive). When the air quality falls below the threshold level, the alarm is triggered. A value of 1 represents the worst air quality, and 100 represents the best. The default value is 35.
Step 9 Trigger spectrum event-driven radio resource management (RRM) to run when a Cisco CleanAir-enabled access point detects a significant level of interference by entering these commands:
Step 10 Enable persistent devices propagation by entering this command:
config advanced { 802.11a | 802.11b } channel pda-prop { enable | disable }
Step 11 Save your changes by entering this command:
Step 12 See the Cisco CleanAir configuration for the 802.11a/n or 802.11b/g/n network by entering this command:
show {802.11a | 802.11b} cleanair config
Information similar to the following appears:
Step 13 See the spectrum event-driven RRM configuration for the 802.11a/n or 802.11b/g/n network by entering this command:
show advanced {802.11a | 802.11b} channel
Information similar to the following appears:
To configure Cisco CleanAir functionality for a specific access point using the controller GUI, follow these steps:
Step 1 Choose Wireless > Access Points > Radios > 802.11a/n or 802.11b/g/n to open the 802.11a/n (or 802.11b/g/n) Radios page.
Figure 14-2 802.11a/n Cisco APs > Configure Page
Step 2 Hover your cursor over the blue drop-down arrow for the desired access point and click Configure . The 802.11a/n (or 802.11b/g/n) Cisco APs > Configure page appears.
The CleanAir Capable field shows whether this access point can support CleanAir functionality. If it can, go to the next step to enable or disable CleanAir for this access point. If the access point cannot support CleanAir functionality, you cannot enable CleanAir for this access point.
Note By default, the Cisco CleanAir functionality is enabled on the radios.
Step 3 Enable Cisco CleanAir functionality for this access point by choosing Enable from the CleanAir Status drop-down list. To disable CleanAir functionality for this access point, choose Disable . The default value is Enable. This setting overrides the global CleanAir configuration for this access point.
The Number of Spectrum Expert Connections text box shows the number of Spectrum Expert applications that are currently connected to the access point radio. Up to three active connections are possible.
Step 4 Click Apply to commit your changes.
Step 5 Click Save Configuration to save your changes.
Step 6 Click Back to return to the 802.11a/n (or 802.11b/g/n) Radios page.
Step 7 View the Cisco CleanAir status for each access point radio by looking at the CleanAir Status text box on the 802.11a/n (or 802.11b/g/n) Radios page.
The Cisco CleanAir status is one of the following:
Note You can create a filter to make the 802.11a/n Radios page or the 802.11b/g/n Radios page show only access point radios that have a specific Cisco CleanAir status (such as UP, DOWN, ERROR, or N/A). This feature is especially useful if your list of access point radios spans multiple pages, preventing you from viewing them all at once. To create a filter, click Change Filter to open the Search AP dialog box, select one or more of the CleanAir Status check boxes, and click Find. Only the access point radios that match your search criteria appear on the 802.11a/n Radios page or the 802.11b/g/n Radios page, and the Current Filter parameter at the top of the page specifies the filter used to generate the list (for example, CleanAir Status: UP).
Step 1 Configure Cisco CleanAir functionality for a specific access point by entering this command:
config {802.11a | 802.11b} cleanair {enable | disable} Cisco_AP
Step 2 Save your changes by entering this command:
Step 3 See the Cisco CleanAir configuration for a specific access point on the 802.11a/n or 802.11b/g/n network by entering this command:
show ap config {802.11a | 802.11b} Cisco_AP
Information similar to the following appears:
Note See Step 7 in the “Configuring Cisco CleanAir on an Access Point (GUI)” section for descriptions of the spectrum management operation states and the possible error codes for the spectrum sensor state.
This section contains the following topics:
You can configure Cisco CleanAir only on CleanAir-enabled access points.
Step 1 Choose Monitor > Cisco CleanAir > 802.11a/n or 802.11b/g > Interference Devices to open the CleanAir > Interference Devices page.
Figure 14-3 CleanAir > Interference Device Page
This page shows the following information:
When a CleanAir-enabled access point detects interference devices, detections of the same device from multiple sensors are merged together to create clusters. Each cluster is given a unique ID. Some devices conserve power by limiting the transmit time until actually needed which results in the spectrum sensor to temporarily stop detecting the device. This device is then correctly marked as down. A down device is correctly removed from the spectrum database. In cases when all the interferer detections for a specific devices are reported, the cluster ID is kept alive for an extended period of time to prevent possible device detection bouncing. If the same device is detected again, it is merged with the original cluster ID and the device detection history is preserved.
For example, some bluetooth headsets operate on battery power. These devices employ methods to reduce power consumption, such as turning off the transmitter when not actually needed. Such devices can appear to come and go from the classification. To manage these devices, CleanAir keeps the cluster IDs longer and they are remerged into a single record upon detection. This process smoothens the user records and accurately represents the device history.
Step 2 Click Change Filter to display the information about interference devices based on a particular criteria.
Step 3 Click Clear Filter to remove the filter and display the entire access point list.
You can create a filter to display the list of interference devices that are based on the following filtering parameters:
Choose one of the interferer devices:
Step 4 Click Find to commit your changes.
The current filter parameters are displayed in the Current Filter field.
This section describes the commands that you can use to monitor the interference devices for the 802.11a/n or 802.11b/g/n radio band.
See information for all of the interferers detected by a specific access point on the 802.11a/n or 802.11b/g/n radio band by entering this command:
show {802.11a | 802.11b} cleanair device ap Cisco_AP
Information similar to the following appears:
When a CleanAir-enabled access point detects interference devices, detections of the same device from multiple sensors are merged together to create clusters. Each cluster is given a unique ID. Some devices conserve power by limiting the transmit time until actually needed which results in the spectrum sensor to temporarily stop detecting the device. This device is then correctly marked as down. A down device is correctly removed from the spectrum database. In cases when all the interferer detections for a specific devices are reported, the cluster ID is kept alive for an extended period of time to prevent possible device detection bouncing. If the same device is detected again, it is merged with the original cluster ID and the device detection history is preserved.
For example, some bluetooth headsets operate on battery power. These devices employ methods to reduce power consumption, such as turning off the transmitter when not actually needed. Such devices can appear to come and go from the classification. To manage these devices, CleanAir keeps the cluster IDs longer and they are remerged into a single record upon detection. This process smoothens the user records and accurately represents the device history.
See information for all of the interferers of a specific device type on the 802.11a/n or 802.11b/g/n radio band by entering this command:
View a list of persistent sources of interference for a specific access point on the 802.11a/n or 802.11b/g/n radio band by entering this command:
To monitor persistent devices on a specific access point using the controller GUI:
Choose Wireless > Access Points > Radios > 802.11a/n or 802.11b/g/n to open the 802.11a/n (or 802.11b/g/n) Radios page. Hover your cursor over the blue drop-down arrow for the desired access point and click Detail . The 802.11a/n (or 802.11b/g/n) AP Interfaces > Detail page appears.
This page displays the details of the access points along with the list of persistent devices detected by this access point. Details of the persistent devices is displayed under the Persistent Devices section.
The following information for each persistent device is available:
Class Type —The class type of the persistent device.
Channel —Channel this device is affecting.
DC(%) —Duty cycle (in percentage) of the persistent device.
This section contains the following topics:
To monitor the air quality of radio bands using the controller GUI, follow this step:
Choose Monitor > Cisco CleanAir > 802.11a/n or 802.11b/g >Air Quality Report to open the CleanAir > Air Quality Report page.
Figure 14-4 CleanAir > AIr Quality Report Page
This page shows the air quality of both the 802.11a/n and 802.11b/g/n radio bands. Specifically, it shows the following information:
This section describes the commands that you can use to monitor the air quality of the 802.11a/n or 802.11b/g/n radio band.
See a summary of the air quality for the 802.11a/n or 802.11b/g/n radio band by entering this command:
See information for the 802.11a/n or 802.11b/g/n access point with the air quality by entering this command:
See air quality information for a specific access point on the 802.11a/n or 802.11b/g/n radio band by entering this command:
Step 1 Choose Monitor > Cisco CleanAir > 802.11b/g >Worst Air-Quality to open the CleanAir > Worst Air Quality Report page.
Figure 14-5 CleanAir > Worst Air Quality Report Page
This page shows the air quality of both the 802.11a/n and 802.11b/g/n radio bands. Specifically, it shows the following information:
Step 2 View a list of persistent sources of interference for a specific access point radio as follows:
a. Choose Wireless > Access Points > Radios > 802.11a/n or 802.11b/g/n to open the 802.11a/n (or 802.11b/g/n) Radios page.
b. Hover your cursor over the blue drop-down arrow for the desired access point radio and click CleanAir-RRM . The 802.11a/n (or 802.11b/g/n) Cisco APs > Access Point Name > Persistent Devices page appears. This page lists the device types of persistent sources of interference detected by this access point radio. It also shows the channel on which the interference was detected, the percentage of time that the interferer was active (duty cycle), the received signal strength (RSSI) of the interferer, and the day and time when the interferer was last detected.
This section describes the commands that you can use to monitor the air quality of the 802.11a/n or 802.11b/g/n radio band.
See a summary of the air quality for the 802.11a/n or 802.11b/g/n radio band by entering this command:
See information for the 802.11a/n or 802.11b/g/n access point with the worst air quality by entering this command:
See air quality information for a specific access point on the 802.11a/n or 802.11b/g/n radio band by entering this command:
show {802.11a | 802.11b} cleanair device ap Cisco_AP
Information similar to the following appears:
show {802.11a | 802.11b} cleanair device type type
where you choose the type as one of the following:
– 802.11-fh— An 802.11 frequency-hopping device (802.11b/g/n only)
– 802.11-inv —A device using spectrally inverted Wi-Fi signals
– 802.11-nonstd —A device using nonstandard Wi-Fi channels
– 802.15.4 —An 802.15.4 device (802.11b/g/n only)
– all —All interference device types (this is the default value)
– bt-discovery —A bluetooth discovery (802.11b/g/n only)
– bt-link —A bluetooth link (802.11b/g/n only)
– canopy —A canopy bridge device
– cont-tx —A continuous transmitter
– dect-like —A digital enhanced cordless communication (DECT)-compatible phone
– mw-oven— A microwave oven (802.11b/g/n only)
– superag —An 802.11 SuperAG device
– tdd-tx —A time division duplex (TDD) transmitter
– video camera —An analog video camera
– wimax-fixed —A WiMAX fixed device
– wimax-mobile —A WiMAX mobile device
To obtain detailed spectrum data that can be used to generate RF analysis plots similar to those provided by a spectrum analyzer, you can configure a Cisco CleanAir-enabled access point to connect directly to a Microsoft Windows XP or Vista PC running the Spectrum Expert application (referred to as a Spectrum Expert console ). You can initiate the Spectrum Expert connection semi-automatically from WCS or by manually launching it from the controller. This section provides instructions for the latter.
To configure a Spectrum Expert, follow these steps:
Step 1 Prior to establishing a connection between the Spectrum Expert console and the access point, make sure that IP address routing is properly configured and the network spectrum interface (NSI) ports are open in any intervening firewalls.
Step 2 Make sure that Cisco CleanAir functionality is enabled for the access point that will be connected to the Spectrum Expert console.
Step 3 Configure the access point for SE-Connect mode using the controller GUI or CLI.
Note The SE-Connect mode is set for the entire access point, not just a single radio. However, the Spectrum Expert console connects to a single radio at a time.
a. Choose Wireless > Access Points > All APs to open the All APs page.
b. Click the name of the desired access point to open the All APs > Details page.
c. Choose SE-Connect from the AP Mode drop-down list. This mode is available only for access points that are capable of supporting Cisco CleanAir functionality. For the SE-Connect mode to appear as an available option, the access point must have at least one spectrum-capable radio in the Enable state.
d. Click Apply to commit your changes.
e. Click OK when prompted to reboot the access point.
a. To configure the access point for SE-Connect mode, enter this command:
config ap mode se-connect Cisco_AP
b. When prompted to reboot the access point, enter Y.
c. To verify the SE-Connect configuration status for the access point, enter this command:
show ap config { 802.11a | 802.11b } Cisco_AP
Information similar to the following appears:
Step 4 On the Windows PC, access the Cisco Software Center from this URL:
http://www.cisco.com/cisco/software/navigator.html
Step 5 Click Product > Wireless > Cisco Spectrum Intelligence > Cisco Spectrum Expert > Cisco Spectrum Expert Wi-Fi , and then download the Spectrum Expert 4.0 executable (*.exe) file.
Step 6 Run the Spectrum Expert application on the PC.
Step 7 When the Connect to Sensor dialog box appears, enter the IP address of the access point, choose the access point radio, and enter the 16-byte network spectrum interface (NSI) key to authenticate. The Spectrum Expert application opens a TCP/IP connection directly to the access point using the NSI protocol.
Note The access point must be a TCP server listening on ports 37540 for 2.4 GHz and 37550 for 5 GHz frequencies. These ports must be opened for the spectrum expert application to connect to the access point using the NSI protocol.
Note To view the NSI key from the controller CLI, enter the show ap config {802.11a | 802.11b} Cisco_AP command. To view the NSI key from the controller GUI, choose Wireless > Access Points > All APs to open the All APs page. Click the name of the desired access point to open the All APs > Details page. The NSI key appears in the General tab.
When an access point in SE-Connect mode joins a controller, it sends a Spectrum Capabilities notification message, and the controller responds with a Spectrum Configuration Request. The request contains the 16-byte random NSI key generated by the controller for use in NSI authentication. The controller generates one key per access point, which the access point stores until it is rebooted.
Note You can establish up to three Spectrum Expert console connections per access point radio. The Number of Spectrum Expert Connections text box on the 802.11a/n (or 802.11b/g/n) Cisco APs > Configure page of the controller GUI shows the number of Spectrum Expert applications that are currently connected to the access point radio.
Step 8 Verify that the Spectrum Expert console is connected to the access point by selecting the Slave Remote Sensor text box in the bottom right corner of the Spectrum Expert application. If the two devices are connected, the IP address of the access point appears in this text box.
Step 9 Use the Spectrum Expert application to view and analyze spectrum data from the access point.
For additional information related to configuring CleanAir, see the following sections:
Cisco Wireless Control System Configuration Guide URL: http://www.cisco.com/en/US/products/ps6305/products_installation_and_configuration_guides_list.html |
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Cisco Spectrum Expert Users Guide, Release 4.0 URL: http://www.cisco.com/en/US/products/ps9393/products_user_guide_list.html |
Table 14-1 lists the release history for this feature.