Appendix; Configuring Dhcp Option 43 For Cisco 520 Series Access Points; Overview; Configuring Option 43 For Cisco 520 Series Access Points - Cisco 521G - Unified IP Phone VoIP Configuration Manual

Configuring DHCP Option 43 for Cisco 520 Series
Access Points
This appendix describes the steps needed to configure DHCP Option 43 on an enterprise DHCP server,
such as a Cisco Catalyst 3750 series switch, for use with the Cisco 520 series access points (AP521 and
LAP521). This appendix contains these sections:
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Overview

This section contains a DHCP Option 43 configuration example on an enterprise DHCP server, such as
a Cisco Catalyst 3750 series switch, for use with Cisco 520 series access points. For other DHCP server
implementations, consult their product documentation for configuring DHCP Option 43. In Option 43,
you should use the IP address of the controller web-browser interface (GUI).
Note DHCP Option 43 is limited to one access point type per DHCP pool (AP521 or LAP521). You must
configure a separate DHCP pool for each access point type.
The Cisco 520 series access points use the type-length-value (TLV) format for DHCP Option 43. DHCP
servers must be programmed to return the option based on the access point's DHCP Vendor Class
Identifier (VCI) string (DHCP Option 60). The VCI strings for the Cisco 520 series is listed in
Table
Table A-1
Access Point
LAP521 lightweight access point
The format of the TLV block for 520 series access points is listed below:
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OL-15283-01
Overview, page A-1
Configuring Option 43 for Cisco 520 Series Access Points, page A-2
A-1:
Cisco 520 Series Lightweight Access Point VCI String
Type: 0xf1 (decimal 241)
Length: Number of controller IP addresses * 4
Value: List of WLC management interfaces
A P P E N D I X
Vendor Class Identifier (VCI)
Cisco AP c520
Cisco 500 Series Wireless Express Mobility Controller Configuration Guide
A
A-1