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This method is used by large enterprises that have a single DNS suffix. Or, if the company has multiple DNS suffixes and the controllers are segregated by suffix.ĭHCP option 43 is used by large companies to localize the information via the DHCP. This method should be used by companies that have all of their controllers in a single location and own a local DNS server.
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This allows the LAP to discover multiple controllers. You can have multiple entries of the same DNS name. The next easiest method of deployment is to use a DNS entry with DHCP. This method should be used for companies that have a small network and do not own a local DNS server.
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In addition to these methods, the LAP does automatically look on the local subnet for controllers with a 255.255.255.255 local broadcast. If you do not tell the LAP where the controller is via DHCP option 43, DNS resolution of "Cisco-capwap-controller.local_domain", or statically configure it, the LAP does not know where in the network to find the management interface of the controller. However, this presents a question: how did the LAPs find the management IP address of the controller when it is on a different subnet? In a Cisco Unified Wireless network, the LAPs must first discover and join a WLC before they can service wireless clients. Overview of the Wireless LAN Controller (WLC) Discovery and Join Process Refer to Cisco Technical Tips Conventions for more information on document conventions.
#Unable to join network mac address how to
This document also provides information on some of the reasons why a Lightweight Access Point (LAP) fails to join a WLC and describes how to troubleshoot the issues.Ĭisco recommends that you have knowledge of these topics:īasic knowledge of the configuration of LAPs and Cisco WLCsīasic knowledge of Lightweight Access Point Protocol (CAPWAP) This document gives an overview of the Wireless LAN Controller (WLC) Discovery and Join Process.