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Basic Installation Guidelines, Controller Discovery Process for Lightweight Access Points - dhcp server

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Basic Installation Guidelines Chapter 2 Installing the Access Point Basic Installation Guidelines Because the access point is a radio device, it is susceptible to interference that can reduce throughput and range. Follow these basic guidelines to ensure the best possible performance: • Ensure that a site survey has been performed to determine the optimum placement of access points. • For lightweight access points, check the latest release notes to ensure that your controller software version supports the access points to be installed. You can find the controller release notes by selecting your controller under Wireless LAN Controllers at this URL: http://www.cisco.com/cisco/web/psa/default.html • Ensure that access points are not mounted closer than 20 cm (7.9 in) from the body of all persons. • Do not mount the access point within 3 feet of metal obstructions. • Install the access point away from microwave ovens. Microwave ovens operate on the same frequency as the access point and can cause signal interference. • Do not mount the access point outside of buildings. • Do not mount the access points on building perimeter walls unless outside coverage is desired. Controller Discovery Process for Lightweight Access Points The lightweight access point supports these controller discovery processes: • DHCP server discovery-Uses DHCP Option 43 to provide controller IP addresses to the access points. Cisco switches support a DHCP server option. For additional information, refer to the "Configuring DHCP Option 43 for Lightweight Access Points" section on page G-1. • DNS server discovery-The access point uses the name CISCO-LWAPP-CONTROLLER. to discover the controller IP addresses from a DNS server. Where is the access point domain name. • Locally stored controller IP addresses-If the access point was previously associated to a controller, the IP addresses of the primary, secondary, and tertiary controllers are stored in the access point non-volatile memory. The process of storing controller IP addresses in access points for later deployment is called priming the access point. For additional information, refer to the "Priming Lightweight Access Points Prior to Deployment" section on page F-1. You can also manually configure controller information using CLI commands on new (out-of-the-box) access points that are not connected to a controller. For additional information refer to the "Manually Configuring Controller Information Using the Access Point CLI" section on page 4-7. Cisco recommends that you configure a DHCP server with Option 43 to provide the controller IP addresses to your access points. Cisco switches provide a DHCP server option that is typically used for this purpose. Cisco Aironet 1240AG Series Access Point Hardware Installation Guide 2-4 OL-8371-05

Section	Page
Cisco Aironet 1240AG Series Access Point Hardware Installation Guide	1
Contents	3
Preface	9
Audience	9
Purpose	9
Organization	9
Conventions	10
Related Publications	12
Locating the Product Serial Number	13
Obtaining Documentation, Obtaining Support, and Security Guidelines	14
Overview	15
Product Terminology	15
Autonomous Access Points	15
Lightweight Access Points	16
Guidelines for Using Cisco Aironet Lightweight Access Points	16
Hardware Features	17
Single or Dual-Radio Operation	19
Antennas Supported	19
Ethernet Port	19
Console Port	19
LEDs	19
Power Sources	20
UL 2043 Certification	20
Anti-Theft Features	20
Network Examples with Autonomous Access Points	22
Root Access Point on a Wired LAN	23
Repeater Unit that Extends Wireless Range	24
Central Unit in an All-Wireless Network	25
Bridge Network with Wireless Clients	25
Point-to-Point Bridge Configuration	26
Workgroup Bridge Network	26
Network Example with Lightweight Access Points	27
Installing the Access Point	29
Safety Information	30
FCC Safety Compliance Statement	30
General Safety Guidelines	30
Warnings	30
Unpacking the Access Point	31
Package Contents	31
Basic Installation Guidelines	32
Controller Discovery Process for Lightweight Access Points	32
Deploying the Access Points on the Wireless Network	33
Access Point Layout and Connectors	34
Mounting Overview	35
Mounting on a Horizontal or Vertical Surface	37
Mounting Below a Suspended Ceiling	38
Mounting Above a Suspended Ceiling	39
Mounting Access Point on a Desktop or Shelf	42
Cable Security Bracket	42
Removing the Cable Security Bracket	43
Attaching the Access Point to the Mounting Plate	44
Securing the Access Point	45
Using a Security Cable	45
Securing the Access Point to the Mounting Plate	46
Connecting the Ethernet and Power Cables	48
Connecting to an Ethernet Network with an Inline Power Source	49
Connecting to an Ethernet Network with Local Power	50
Powering Up the Access Point	50
Troubleshooting 1240AG Series Autonomous Access Points	51
Checking the Autonomous Access Point LEDs	52
Checking Basic Settings	53
Default IP Address Behavior	54
Enabling the Radio Interfaces	54
SSID	54
WEP Keys	55
Security Settings	55
Low Power Condition	55
Intelligent Power Management	56
Inline Power Status Messages	57
Configuring Power Using the CLI	59
Issuing the Cisco IOS Command Using the CLI	60
Configuring the Access Point System Power Settings Using a Browser	61
Running the Carrier Busy Test	63
Running the Ping Test	64
Resetting to the Default Configuration	64
Using the MODE Button	65
Using the Web Browser Interface	65
Reloading the Access Point Image	66
Using the MODE Button	66
Web Browser Interface	67
Browser HTTP Interface	67
Browser TFTP Interface	68
Obtaining the Access Point Image File	69
Connecting to the Access Point Locally	70
Obtaining the TFTP Server Software	70
Troubleshooting 1240AG Series Lightweight Access Points	71
Guidelines for Using Cisco Aironet Lightweight Access Points	72
Using DHCP Option 43	72
Checking the Lightweight Access Point LEDs	73
Low Power Condition for Lightweight Access Points	75
Intelligent Power Management	75
Configuring Power Using Controller CLI Commands	76
Manually Configuring Controller Information Using the Access Point CLI	77
Configuring Controller Information	78
Clearing Manually Entered Controller Information	78
Manually Resetting the Access Point to Defaults	78
Returning the Lightweight Access Point to Autonomous Mode	79
Using a Controller to Return the Access Point to Autonomous Mode	79
Using the MODE Button to Return the Access Point to Autonomous Mode	79
MODE Button Setting	80
Obtaining the Autonomous Access Point Image File	80
Connecting to the Access Point Locally	81
Obtaining the TFTP Server Software	82
Translated Safety Warnings	83
Declarations of Conformity and Regulatory Information	85
Manufacturers Federal Communication Commission Declaration of Conformity Statement	86
VCCI Statement for Japan	87
Industry Canada	87
Canadian Compliance Statement	87
European Community, Switzerland, Norway, Iceland, and Liechtenstein	88
Declaration of Conformity with Regard to the 1999/5/EC (R&TTE Directive)	88
Declaration of Conformity for RF Exposure	91
Guidelines for Operating Cisco Aironet Access Points in Japan	92
Japanese Translation	92
English Translation	92
Administrative Rules for Cisco Aironet Access Points in Taiwan	93
Access Points with IEEE 802.11a Radios	93
Chinese Translation	93
English Translation	93
All Access Points	94
Chinese Translation	94
English Translation	94
Operation of Cisco Aironet Access Points in Brazil	95
Access Point Models	95
Regulatory Information	95
Portuguese Translation	95
English Translation	95
Declaration of Conformity Statements	96
Declaration of Conformity Statements for European Union Countries	96
Access Point Specifications	99
Channels and Maximum Power Levels	103
Console Cable Pinouts	105
Overview	106
Console Port Signals and Pinouts	106
Priming Lightweight Access Points Prior to Deployment	107
Configuring DHCP Option 43 for Lightweight Access Points	111
Overview	112
Configuring Option 43 for 1000 Series Access Points	113
Configuring Option 43 for 1100, 1130, 1200, 1240, and 1300 Series Lightweight Access Points	114
Glossary	115

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2-4

Cisco Aironet 1240AG Series Access Point Hardware Installation Guide

OL-8371-05

Chapter 2

Installing the Access Point

Basic Installation Guidelines

Because the access point is a radio device, it is susceptible to interference that can reduce throughput

and range. Follow these basic guidelines to ensure the best possible performance:

•

Ensure that a site survey has been performed to determine the optimum placement of access points.

•

For lightweight access points, check the latest release notes to ensure that your controller software

version supports the access points to be installed. You can find the controller release notes by

selecting your controller under

Wireless LAN Controllers

at this URL:

http://www.cisco.com/cisco/web/psa/default.html

•

Ensure that access points are not mounted closer than 20 cm (7.9 in) from

the body of all persons

•

Do not mount the access point within 3 feet of metal obstructions.

•

Install the access point away from microwave ovens. Microwave ovens operate on the same

frequency as the access point and can cause signal interference.

•

Do not mount the access point outside of buildings.

•

Do not mount the access points on building perimeter walls unless outside coverage is desired.

Controller Discovery Process for Lightweight Access Points

The lightweight access point supports these controller discovery processes:

•

DHCP server discovery—Uses DHCP Option 43 to provide controller IP addresses to the access

points. Cisco switches support a DHCP server option. For additional information, refer to the

“Configuring DHCP Option 43 for Lightweight Access Points” section on page G-1

•

DNS server discovery—The access point uses the name

CISCO-LWAPP-CONTROLLER.<local

domain>

to discover the controller IP addresses from a DNS server. Where

is the

access point domain name.

•

Locally stored controller IP addresses—If the access point was previously associated to a controller,

the IP addresses of the primary, secondary, and tertiary controllers are stored in the access point

non-volatile memory. The process of storing controller IP addresses in access points for later

deployment is called priming the access point. For additional information, refer to the

“Priming

Lightweight Access Points Prior to Deployment” section on page F-1

You can also manually configure controller information using CLI commands on new

(out-of-the-box) access points that are not connected to a controller. For additional information refer

to the

“Manually Configuring Controller Information Using the Access Point CLI” section on

page 4-7

Cisco recommends that you configure a DHCP server with Option 43 to provide the controller IP

addresses to your access points. Cisco switches provide a DHCP server option that is typically used for

this purpose.