Cisco AIR-WLC2006-K9 - Wireless LAN Controller 2006 Guía de usuario descargar pdf (Pagina 32)

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Cisco Wireless LAN Solution Product Guide

OL-7955-01

Chapter 1 Overview

Cisco Wireless LAN Controllers

• Allows the operator to assign nearby Cisco 1000 series lightweight access points into groups to

streamline Radio Resource Management algorithm processing.

• Load balances new clients across grouped Cisco 1000 series lightweight access points reporting to

each Cisco Wireless LAN Controller. This is particularly important when many clients converge in

one spot (such as a conference room or auditorium), because RRM can automatically force some

subscribers to associate with nearby access points, allowing higher throughput for all clients.

• Automatically detects and configures new Cisco 1000 series lightweight access points as they are

added to the network. RRM automatically adjusts nearby Cisco 1000 series lightweight access

points to accommodate the increased coverage and capacity.

• Automatically detects and configures new Cisco Wireless LAN Controllers as they are added to the

network. RRM automatically distributes associated Cisco 1000 series lightweight access points to

maximize coverage and capacity.

• Detects and reports coverage holes, where clients consistently connect to a Cisco 1000 Series

lightweight access point at a very low signal strength.

• Automatically defines Cisco Wireless LAN Controller Groups within operator-defined Mobility

Groups.

The RRM solution thus allows the operator to avoid the costs of laborious historical data interpretation

and individual Cisco 1000 Series IEEE 802.11a/b/g lightweight access point reconfiguration. The power

control features of RRM ensure client satisfaction, and the coverage hole detection feature can alert the

operator to the need for an additional (or relocated) Cisco 1000 series lightweight access point.

Note that the RRM uses separate monitoring and control for each of the deployed networks: 802.11a and

802.11b/802.11g. Also note that RRM is automatically enabled, but can be customized or disabled for

individual Cisco 1000 series lightweight access points.

Finally, for operators requiring easy manual configuration, the RRM can recommend the best Cisco

Radio settings, and then assign them on operator command.

The RRM controls produce a network that has optimal capacity, performance, and reliability. The RRM

functions also free the operator from having to continually monitor the network for noise and

interference problems, which can be transient and difficult to troubleshoot. Finally, RRM controls ensure

that clients enjoy a seamless, trouble-free connection through the Cisco WLAN Solution 802.11

network.

Cisco Wireless LAN Controllers

When you are adding Cisco 1000 series lightweight access points to a multiple Cisco Wireless LAN

Controller deployments network, it is convenient to have all Cisco 1000 series lightweight access points

associate with one master controller on the same subnet. That way, the operator does not have to log into

multiple controllers to find out which controller newly-added Cisco 1000 series lightweight access

points associated with.

One controller in each subnet can be assigned as the master controller while adding lightweight access

points. As long as a master controller is active on the same subnet, all new access points without a

primary, secondary, and tertiary controller assigned automatically attempt to associate with the master

Cisco Wireless LAN Controller. This process is described in the “Cisco Wireless LAN Controller

Failover Protection” section on page 1-27.

The operator can monitor the master controller using the WCS Web User Interface and watch as access

points associate with the master controller. The operator can then verify access point configuration and

assign a primary, secondary, and tertiary controller to the access point, and reboot the access point so it

reassociates with its primary, secondary, or tertiary controller.

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