Fundamentals of Wireless LANs 1.2

Module 5: Access Points

Overview

Access Point Connection

Introduction

Cable and Power

• Cisco Aironet 1100 and 1200 Series, can be powered over Ethernet with:– Switch with inline power (Option 1)– Inline power patch panel (Option 2)– Optional inline power injector (Option3)– Universal power supply (Option 4)

Cable and Power

• WARNING Never connect both the DC power to the AP power port and inline power simultaneously

AP Installation

LED indicators

• The LED lights on an access point convey status information. • When the access point is powering on, all three LEDs normally blink. • After bootup, the colors of the LEDs represent the following:

– Green LEDs indicate normal activity. – Amber LEDs indicate errors or warnings. – Red LEDs mean the unit is not operating correctly or is being

upgraded.

1100 AP 1200 AP

Reset the AP (Power On)

• When beginning a lab, to make sure the AP has the default settings, you will reset the AP.

• Follow these steps to reset the access point to factory default settings using the access point MODE button:

• Step 1 Disconnect power (the power jack for external power or the Ethernet cable for in-line power) from the access point.

• Step 2 Press and hold the MODE button while power to the access point is reconnected.

• Step 3 Hold the MODE button until the Status LED turns amber (approximately 1 to 2 seconds), and release the button. All access point settings return to factory defaults.

1100 AP1200 AP

Reset the AP (Power On)

• The Reset button on the 340 and 350 AP is in a small hole on the back panel of the base station.

• To activate the Reset button, insert a straightened paper clip into the small hole and press.

• Remove the paper clip. • The Status LED blinks amber to show the base station has the

default parameter values.

350 AP

Connecting to the AP (Configuration)

Wired Wireless: Requires Association

Connecting to the AP (Configuration)

• Console: 9600-8-N-1-None OR• Ethernet or Wireless adapter:

– Unless routed, be sure it is on the IP addresses are same subnet.

) ) ) ) )10.0.0.101/24

10.0.0.1/2410.0.0.102/24

Connecting to the AP (Console)

• There are two different types of CLI:– IOS CLI– VxMenu No longer supported. YES!!!

ConsoleSerial

Rollover Cable

VxMenuIOS CLI

Connecting to the AP (Telnet)

Requires a network connection either Ethernet or Wireless

• AP Defaults– IP Address = 10.0.0.1/24– Username and Password =

Cisco (“C” not “c”)– This password is the privilege

password, not the WEP password.

Cisco

Connecting to the AP (Browser)

Wired Wireless: Requires AssociationPreferred Method!

Connecting to the AP (Wireless)

• Wireless adapter: – If configuring using the wireless adapter, you must first associate with

the AP.– Make sure the settings on the ACU match the AP.– Cisco 1100 and 1200 Aps have the following defaults:

• IP Address = 10.0.0.1 255.255.255.224 Not after 12.x• SSID = tsunami IOS 12.x and later do not have a default SSID• Password = Cisco (“C” not “c”)

SSID = tsunamiSSID = tsunami

Connecting to the AP (Wireless) cont.

• After IOS version 12.3(7)JA, Cisco access points no longer have a default SSID or default IP address on the BVI.

• You will have to log in via the console using Cisco/Cisco and create an SSID and IP address if you want to telnet/ssh or connect to the AP via the web interface.

• Cisco introduced global-mode SSID configuration in Cisco IOS Release 12.3(2)JA to simplify configuration of SSID parameters under multiple interfaces.

Connecting to the AP (Wired)

• Wired Ethernet: – No association necessary

– Make sure the IP Address on the Ethernet interface is on the same subnet as the AP.

– AP Defaults• IP Address = 10.0.0.1 255.255.255.224• Password = Cisco (“C” not “c”)

SSID = tsunami10.0.0.1/27

10.0.0.102/27

SSID = tsunami

Preferred Method!

See previous slide

Labs and Station Connectivity

• In the lab we will need to take steps to make sure you are configuring and connected to the AP that you think you are!

• We will first connect via a wired interface, change the SSID and IP addressing on the AP, different from what the labs show.

AP1

AP2

Hey, what happened to my settings on AP2!

Configuring AP1 is easy!

10.0.0.1

10.0.0.1

Wired Wireless

Configuring IP Addresses

Configuring IP Addresses

Configuring the IP address on Host’s Ethernet interface

Note: /24 will work because the host still believes it is on the same subnet as the AP (and visa versa)

224

Access the AP via the Browser

Cisco

10.0.0.1

/27

Two things to change

• At the beginning of each lab, after you have connected via the wired Ethernet interface, you will change the IP Address and SSID on the AP, so the other Lab Station does not accidentally configure yours.

• You will also need to change your Host’s IP address.

Ex: 192.168.1.1/24 Ex: 192.168.1.2/27SSID: AP-Pod1

Hostname Not SSID

224

Cisco AP Factory Default Settings

255.255.255.224 (/27)

This does not apply to access points running IOS version 12.3(7)JA or newer

Basic Configuration

The labs will really help you understand this.

Configure IP address and SSID with IPSU

• IP Setup Utility (IPSU) can only change the IP address and SSID of the access point from their default settings.

• After the IP address and SSID have been changed, IPSU cannot change them again unless the mode button is held down.

• Use a computer on the wired LAN to communicate with the AP through the wired LAN. • The IPSU must be installed on the computer on the same subnet as the AP.• IPSU uses IP multicast to communicate with the AP• We will not use IPSU.• See 5.2.1 if you are interested.

Navigating the GUI

Home Summary Page (IOS)

MAC addresses returned when pinging the AP from wired or wireless client.

Rec. Trans. SA/DA/BSSID

Express Setup

• Always configure and test the basics first, before configuring authentication and other options.

Using the CLI

• Almost exactly the same as using the Router IOS.

The AP’s IP address

• Same IP address whether you are connecting via the wired or wireless interface. (For configuring the AP.)

Association

or

Click here…

Association -> MAC Address

ACU - Verifying

Right click

Link Test

Link Status

Network Interfaces

Only part of the screen shown.

Network Interfaces

Network Interfaces – Fast Ethernet

Only part of the screen shown.

Network Interfaces – Radio-802.11B

Only part of the screen shown.

Network Interfaces – Radio-802.11B

Only part of the screen shown.

Network Interfaces – Radio-802.11B

Only part of the screen shown.

Network Interfaces – Radio-802.11B (Settings)

Network Interfaces – Radio-802.11B (Settings)

Network Interfaces – Radio-802.11B (Settings)

Network Interfaces – Radio-802.11B (Settings)

PLCP frame!

Network Interfaces – Radio-802.11B (Settings)

Network Interfaces – 802.11b

Network Interfaces –

Radio-802.11B

802.11B

Network Interfaces – Radio-802.11A (Settings)

Only part of the screen shown.

802.11a contains some slightly different options

Services

Services

• The Services Summary page shows whether all of the main services are currently enabled or disabled.

Telnet/SSH

Hot Standby

• We will not be configuring Hot Standby

CDP

DNS

Filters

• Allows you to accept/deny specific MAC or IP addresses.

HTTP

• This feature enables Web-based GUI management by providing support for HTML Web pages and Common Gateway Interface (CGI) scripts using common Web browsers.

• The Services>Web Server page is used to enable browsing to the web-based management system, specify the location of the Help files, and enter settings for a custom-tailored web system for management.

• With the Allow Web-based Configuration Management enabled, access to the GUI management system is permitted.

• If HTTP is disabled, the management system is accessible only through Telnet or the console

HTTP – Help Files

• Hard Drive - The help files can be copied to the hard drive of the computer which is used to manage the wireless LAN. Go to http://www.cisco.com/public/sw-center/sw-wireless.shtml to download the help files for the particular release. The readme.txt file explains how to download the help files to the hard drive. This URL starting with file:// may not be accessible if the security settings of the browser are not set appropriately. Example:

• file://[Drive letter]:\[folder or subdirectory]\wireless\help

Proxy Mobile IP

• Allows Layer 3 Roaming

QoS – Not Covered

• QoS is disabled by default. • The most important guideline in QoS deployment is to be familiar with the traffic on the

wireless LAN. • It is important to know the applications used by wireless client devices, the delay

sensitivity of the applications, and the amount of traffic associated with the applications. • QoS does not create additional bandwidth for the wireless LAN. • Rather it helps control the allocation of bandwidth. If there is adequate bandwidth on the

WLAN, QoS may not be needed.

SNMP – Not covered

NTP