Cisco AIR-WLC2006-K9 - Wireless LAN Controller 2006 Guía de usuario descargar pdf (Pagina 40)

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Cisco Wireless LAN Solution Product Guide

OL-7955-01

Chapter 1 Overview

Dynamic Frequency Selection

In this release, support is being added for the AAA server to return the VLAN number or name using the

standard "RADIUS assigned VLAN name/number" feature defined in IETF RFC 2868 (RADIUS

Attributes for Tunnel Protocol Support). To assign a wireless client to a particular VLAN, the AAA

server sends the following attributes to the controller in the access accept message:

• IETF 64 (Tunnel Type): VLAN

• IETF 65 (Tunnel Medium Type): 802

• IETF 81 (Tunnel Private Group ID): VLAN # or VLAN Name String

This enables Cisco Secure ACS to communicate a VLAN change that may be a result of a posture

analysis. Benefits of this new feature include:

• Integration with Cisco Secure ACS reduces installation and setup time

• Cisco Secure ACS operates smoothly across both wired and wireless networks

This feature supports 2000, 4100, and 4400 series controllers and 1000, 1130, 1200 and 1500 series

lightweight access points.

Dynamic Frequency Selection

The Cisco Wireless LAN solution complies with regulations in Europe and Singapore that require radio

devices to use Dynamic Frequency Selection (DFS) to detect radar signals and avoid interfering with

them.

When a lightweight access point with a 5-GHz radio operates on one of the 15 channels listed in

Table 1-1, the controller to which the access point is associated automatically uses DFS to set the

operating frequency.

When you manually select a channel for DFS-enabled 5-GHz radios, the controller checks for radar

activity on the channel for 60 seconds. If there is no radar activity, the access point operates on the

channel you selected. If there is radar activity on the channel you selected the controller automatically

selects a different channel, and after 30 minutes, the access point re-tries the channel you selected.

Note The Rogue Location Detection Protocol (RLDP) is not supported on the channels listed in Table 1-1.

Note The maximum legal transmit power is greater for some 5-GHz channels than for others. When it

randomly selects a 5-GHz channel on which power is restricted, the controller automatically reduces

transmit power to comply with power limits for that channel.

Table 1-1 5-GHz Channels on Which DFS is Automatically Enabled

52 (5260 MHz) 104 (5520 MHz) 124 (5620 MHz)

56 (5280 MHz) 108 (5540 MHz) 128 (5640 MHz)

60 (5300 MHz) 112 (5560 MHz) 132 (5660 MHz)

64 (5320 MHz) 116 (5580 MHz) 136 (5680 MHz)

100 (5500 MHz) 120 (5600 MHz) 140 (5700 MHz)

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Cisco AIR-WLC2006-K9 - Wireless LAN Controller 2006 Guía de usuario Pagina 40