Managing WLANs


You can use the Devices tab to manage devices with WLSE. This tab contains the tools necessary to discover and manage devices, perform inventories, and organize devices into groups for easier management. After devices are discovered and managed, you can use the other WLSE features.

Configuring Devices

To manage the devices on your WLAN, you must set up the devices, configure WLSE, discover the devices, and then configure WLSE to manage those devices. This is accomplished following these steps:

Step 1.

Configure your devices. Before WLSE can manage the devices, they must be configured correctly. Also, if you use WLSE radio management, you must configure IOS APs for wireless domain services (WDS) and LEAP authentication.

Note

The steps necessary to configure an AP for WDS are explained in Chapter 7, "Wireless and Wired LAN Integration Overview."

Step 2.

Log in to the WLSE.

Step 3.

Enter device credentials on the WLSE. Credentials depend on the type of device you configure. Table 10-2 lists the devices and the credential format for each. If you are confused about what to enter, the help screen can most likely tell you what information you need.

Table 10-2. Device Credential Format

Device

Description

Credential Format

All Managed Devices

WLSE uses SNMP community strings to discover devices and to enable other WLSE options, and includes firmware updates, configuration, and radio management.

SNMP Communities

Non-IOS APs

HTTP usernames and passwords are used on non-IOS APs. They are needed to download configuration files.

HTTP User/Password

IOS APs (HTTP ports)

HTTP port settings are needed for reports on IOS APs. These settings are used to link reports to the Web interfaces of APs.

IOS HTTP Port Settings

IOS APs (Telnet)

Telnet or SSH usernames and passwords are needed to configure IOS APs and for firmware upgrade.

Telnet/SSH User/Password

Wireless LAN Context Control Protocol (WLCCP) Credentials

If WLSE is used to monitor WDS, the WLCCP credentials must be provided.

WLCCP Credentials


You enter device credentials as follows: Devices > Discover > Device Credentials. Then select the type of credential you want to enter, as listed in the Credential Format column in Table 10-2.

Step 4.

Discover devices. This is accomplished if you begin discovery from the WLSE or importing devices. To start the Discovery Wizard, follow Devices > Discover > Discover > Discovery Wizard. The Discovery Wizard offers three ways to introduce devices:

  • Automatic Device Discovery This runs an automatic discovery, based on the Cisco Discovery Protocol (CDP).

  • Import from File This imports devices from a pre-existing file.

  • Import from CiscoWorks This imports devices from a CiscoWorks server.

Step 5.

Verify discovery. Follow Devices > Discover > DISCOVER > Logs to ensure your devices are added to the WLSE.

Step 6.

Set devices to the managed state. You must tell the WLSE which devices you want to manage. This is accomplished if you set them to a managed state. Alternately, if you elect not to manage a device, it is said that those devices are set to an unmanaged state. To set devices to a managed state, do the following:

  1. Follow Devices > Discover > Managed Device > Manage/Unmanage.

  2. Three folders are presented: New (which contains newly discovered devices), Managed, and Unmanaged. Click the folder you wish to view, and then select the device you wish to manage.

  3. Click Manage to set the device to a managed state.

Step 7.

Run an inventory. After devices are added to the managed state, the WLSE performs an inventory to gather device information. You can also elect to run inventory if you poll on-demand. This is useful to do when there are configuration changes on network devices and you want those changes to reflect in the inventory reports.

Step 8.

Create users. This step establishes which features of WLSE the user can access. This is accessed if you follow Administration > User Admin > Manage Roles. At this stage, you can add new roles or manage existing user roles.

Step 9.

Create device groups. WLSE allows you to group managed devices as you see fit. This is useful if you configure several similar devices at the same time. Follow Devices > Group Management, and you call up the Group Details window. From here, you can view groups, create new groups, or manage existing groups.

Radio Management

The heart of WLSE's more interesting functionality comes from its radio management tools. These are the tools that allow you to search for rogue APs, detect interference, and automatically resurvey a site. Radio Manager also eases the deployment and daily management of your WLAN radio network. The subsequent sections explain how to configure Radio Manager.

Configuring the Network for Radio Manager

The information gathered from the Radio Manager tab is collected from the managed devices on your network. Before you can use radio management, you must properly configure the network. The following steps explain how to correctly configure the network to use radio management:

Step 1.

Make sure all APs are managed. (See Step 6 in "Configuring Devices" earlier in this section.)

Step 2.

At least one AP on each subnet must be configured with WDS (demonstrated in Chapter 7) or a central WDS, such as the WLSM or router.

Step 3.

Enable LEAP authentication. This is a means to authenticate between the APs and the WLSE, and it is done separate from client authentication.

Step 4.

Configure WLCCP credentials. (See Step 3 in the "Configuring Devices" section.)

Step 5.

Verify that the active WDS appears on the device tree. Follow these steps:

  1. Select Reports > Device Center.

  2. Open the Wireless Domain Services folder.

  3. Open the Active WDS folder.

  4. Select the device.

  5. Select WDS Summary Report.

  6. Verify that the WLSE to WDS Authentication Status column contains the string "KeysSetUpWithWDS" or "Authenticate."

Step 6.

Verify that the APs are managed with WDS. This is done if you perform the following steps:

  1. Select Reports > Device Center.

  2. Open the Wireless Domain Services folder.

  3. Open the Active WDS folder.

  4. Select the device.

  5. Select WDS Registered APs. A list of all the APs that are registered with this WDS AP is displayed.

Step 7.

Configure the Access Control Server (ACS) server to support fast roaming and simultaneous logins.

Step 8.

Configure the AAA server to allow multiple sessions.

Collecting Radio Location Data

The next step is to collect radio location data. This helps the WLSE "understand" the radio environment and provide information other Radio Manager features need. There are three ways the WLSE can collect this information:

  • AP Radio Scan The APs send beacons on the same channel to detect neighboring APs.

  • Client Walkabout The CCX client is walked throughout the area, detects APs, and then reports back to the WLSE.

  • Radio Monitoring RF statistics are periodically collected and their signal sources are identified.

You can select these methods if you click Radio Manager, and select AP Radio Scan, Client Walkabout, or Radio Monitoring.

Generating Radio Parameters

You can configure radio parameters in one of two ways, which depends on how you collected radio location data:

  • RM Assisted Configuration Used when data has been collected from AP radio scanning or a client walkabout. This is accessed if you follow Radio Manager > RM Assisted Configuration.

  • Assisted Site Survey Used when you want to step through AP radio scan, client walkabout, or radio parameter generation. This wizard is started from the Location Manager window, if you follow Wizard > Assisted Site Survey.

Radio Manager Features

After the aforementioned configuration steps have been accomplished, the WLSE is functional. This section explains how to perform three different management functions: perform an auto re-site survey, set up self healing, and detect interference.

Auto re-site survey and self healing require the following prerequisites, or the features cannot work:

  • The network must be configured for radio management.

  • An AP radio scan must be completed on all the APs on that floor.

  • Radio monitoring must be enabled on all APs on that floor.

  • Network-wide policies to detect network-performance degradation must be established.

  • Buildings and floors must be created in Location Manager.

  • APs must be placed on the floor images.

Auto Re-Site Survey

This feature is used to have Radio Manager examine the AP's current radio performance and compare it against historical data. If Radio Manager determines degradation in performance, a fault is generated.

Follow these steps to set up this feature:

Step 1.

Follow Radio Manager > Auto Re-Site Survey. This calls up the Review Current form, which displays the building and frequency band of the AP that is currently enabled for Auto Re-Site Survey.

Step 2.

Click Select Floor and choose a building from the Floors Selector list.

Step 3.

Click on a floor, and then click the right arrows (>>) to add it to the Selected Floors list.

Step 4.

Click Set Base Values.

Step 5.

Click Compute and Apply. This calculates current performance data for each floor.

Step 6.

Click Finish to complete the survey.

Step 7.

Click Save to save these settings.

Each hour, the baseline data is compared against current performance. If there is 20 percent degradation or more, a fault is generated. The default value is 20 percentyou can set it to whatever value you choose.

Self Healing

The Self Healing feature on Radio Manager automatically adjusts radio parameters of APs to reduce loss of coverage in the event of network failure.

This feature works, however, only if two conditions are met: The APs run at less than full RF power when the survey and installation are done and they are placed such that the self healing function will be supported. If they are set at full power, there is no way that WLSE can turn power up to provide RF coverage for a failed AP.

When Radio Manager does not detect a radio interface on the selected floor for three report intervals, it adjusts power levels on neighboring APs to compensate for it.

This is set up by following these steps:

Step 1.

Select Radio Manager > Self Healing. This calls up a display of currently selected floors that use self healing.

Step 2.

Click Select Floor and choose a building from the Floors Selector list.

Step 3.

Click on a floor, and click the right arrows (>>) to add it to the Selected Floors list.

Step 4.

Click Finish.

Step 5.

Click Save to save these settings.

Note

Self healing is a one-way process, and the administrator should perform another site survey after the fault is corrected.


Detecting Interference

One of the most impressive features of radio monitoring is its ability to monitor your WLAN and discover any interference. You can manage this setting if you follow Faults > Manage Network-Wide Settings > Interference Detection.

On this screen, you can set the threshold condition for which a fault is generated.




Cisco 802.11 Wireless Networking Quick Reference
Cisco 802.11 Wireless Networking Quick Reference
ISBN: 158705227X
EAN: 2147483647
Year: 2005
Pages: 126

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