Extreme Networks Summit WM Series Guía de usuario descargar pdf (Pagina 245)

Summit WM Series WLAN Switch and Altitude Access Point Software Version 4.1 User Guide

245

Summit WM series switch, access points, and WLAN

switch software terms and abbreviations

WPA-PSK Wi-Fi Protected Access with Pre-Shared Key, a special mode of WPA

for users without an enterprise authentication server. Instead, for

authentication, a Pre-Shared Key is used. The PSK is a shared secret

(passphrase) that must be entered in both the Altitude AP or router

and the WPA clients.

This preshared key should be a random sequence of characters at least

20 characters long or hexadecimal digits (numbers 0-9 and letters A-F)

at least 24 hexadecimal digits long. After the initial shared secret, the

Temporal Key Integrity Protocol (TKIP) handles the encryption and

automatic rekeying.

Term Explanation

Altitude AP The Altitude AP is a wireless LAN thin access point (IEEE 802.11)

provided with unique software that allows it to communicate only

with a Summit WM series switch. (A thin access point handles the

radio frequency (RF) communication but relies on a controller to

handle WLAN elements such as authentication.) The Altitude AP also

provides local processing such as encryption. The Altitude AP is a

dual-band access point, with both 802.11a and 802.11b/g radios.

CTP CAPWAP Tunnelling Protocol (CTP). The Altitude AP uses a UDP

(User Datagram Protocol) based tunnelling protocol called CAPWAP

Tunnelling Protocol (CTP) to encapsulate the 802.11 packets and

forward them to the Summit WM series switch.

The CTP protocol defines a mechanism for the control and

provisioning of Altitude APs (CAPWAP) through centralized access

controllers. In addition, it provides a mechanism providing the option

to tunnel the mobile client data between the access point and the

access controller.

Data Collector The Data Collector is an application on the Summit WM series switch

that receives and manages the Radio Frequency (RF) scan messages

sent by the Altitude AP. This application is part of the Summit spy

technique, working in conjunction with the scanner mechanism and

the Analysis Engine to assist in detecting rogue access points.

DRM (dynamic radio/RF

management)

The DRM feature consists of software on the Altitude AP that

provides dynamic radio frequency (RF) management. For Altitude

APs with the DRM feature enabled and on a common channel, the

power levels will be adjusted to balance coverage if an Altitude AP is

added to, or leaves, the network. The feature also allows wireless

clients to be moved to another Altitude AP if the load is too high. The

feature can also be set to scan automatically for a channel, using a

channel selection algorithm.

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