Cisco AIR-WLC2006-K9 - Wireless LAN Controller 2006 Guía de usuario descargar pdf (Pagina 36)

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Cisco Wireless LAN Solution Product Guide

OL-7955-01

Chapter 1 Overview

Cisco WLAN Solution Mobility Groups

Note that if DHCP Required is selected, clients must obtain an IP address via DHCP. Any client with a

static IP address will not be allowed on the network. The Cisco Wireless LAN Controller monitors

DHCP traffic since it acts as a DHCP proxy for the clients.

If slightly less security is tolerable, operators can create wireless LANs with DHCP Required disabled

and a valid DHCP Server IP Address. Clients then have the option of using a static IP Address or

obtaining an IP Address from the designated DHCP Server.

Operators are also allowed to create separate wireless LANs with DHCP Required disabled and a DHCP

Server IP Address of 0.0.0.0. These wireless LANs drop all DHCP requests and force clients to use a

static IP Address. Note that these wireless LANs do not support management over wireless connections.

Cisco WLAN Solution Mobility Groups

Cisco Wireless LAN Solution operators can define Mobility Groups to allow client roaming across

groups of controllers. Because the controllers in multiple-controller deployments can detect each other

across the network and over the air, it is important that each enterprise, institution, and wireless internet

service provider isolate their controllers. The operating system makes it easy for operators to create this

isolation by allowing them to assign a Mobility Group Name to their controllers. This assignment can

be made using the web user interface, WCS, or the CLI.

Before clients can roam, they are automatically associated with their original, or anchor, Cisco Wireless

LAN Controller. This anchor Cisco Wireless LAN Controller maintains the client information and

ensures that the client remains connected with the same IP address across all handoffs for the duration

of the client session.

Note that all the controllers in a Mobility Group must use the same Layer 2 and Layer 3 LWAPP

Operation, or you will defeat the Mobility software algorithm.

Figure 1-4 shows the results of creating Mobility Group Names for two groups of Cisco Wireless LAN

Controllers. The Cisco Wireless LAN Controllers in the ABC Mobility Group recognize and

communicate with each other through their access points and through their shared subnets, but the ABC

Mobility Group tags the XYZ access points as rogue access points. Likewise, the controllers in the XYZ

Mobility Group do not recognize or communicate with the controllers in the ABC Mobility Group. This

feature ensures Mobility Group isolation across the network.

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Cisco AIR-WLC2006-K9 - Wireless LAN Controller 2006 Guía de usuario Pagina 36