Enabling Controller Discovery

An AP can discover the IP address of the controller in the following ways:

From a DNS server

From a DHCP server

Using the Aruba Discovery Protocol (ADP)

At boot time, the AP builds a list of controller IP addresses and then tries these addresses in order until a controller is reached successfully. The list of controller addresses is constructed as follows:

1.If the master provisioning parameter is set to a DNS name, that name is resolved and all resulting addresses are put on the list. If master is set to an IP address, that address is put on the list.

2.If the master provisioning parameter is not set and a controller address was received in DHCP Option 43, that address is put on the list.

3.If the master provisioning parameter is not set and no address was received via DHCP option 43, ADP is used to discover a controller address and that address is put on the list.

4.Controller addresses derived from the server-nameand server-ipprovisioning parameters and the default controller name aruba-masterare added to the list. Note that if a DNS name resolves to multiple addresses, all addresses are added to the list.

This list of controller IP addresses provides an enhanced redundancy scheme for Dell controllers that are located in multiple data centers separated across Layer-3 networks.

Configuring DNS Resolution

APs are factory-configured to use the host name aruba-masterfor the master controller. For the DNS server to resolve this host name to the IP address of the master controller, you must configure an entry on the DNS server for the name aruba-master.

For information on how to configure a host name entry on the DNS server, refer to the vendor documentation for your server.

NOTE: Dell recommends using a DNS server to provide APs with the IP address of the master controller because it involves minimal changes to the network and provides the greatest flexibility in the placement of APs.

When using DNS, the AP can learn multiple IP addresses to associate with a controller. If the primary controller is unavailable or does not respond, the AP continues through the list of learned IP addresses until it establishes a connection with an available controller. This takes approximately 3.5 minutes per controller.

Configuring DHCP Server Communication with APs

You can configure a DHCP server to provide the master controller’s IP address. You must configure the DHCP server to send the controller’s IP address using the DHCP vendor-specific attribute option 43. APs identify themselves with a vendor class identifier set to DellAP in their DHCP request. When the DHCP server responds to the request, it will send the controller’s IP address as the value of option 43.

When using DHCP option 43, the AP accepts only one IP address. If the IP address of the controller provided by DHCP is not available, the AP can use the other IP addresses provisioned or learned by DNS to establish a connection.

For more information on how to configure vendor-specific information on a DHCP server, see DHCP with Vendor- Specific Options on page 837 or refer to the documentation included with your server.

Dell PowerConnect W-Series ArubaOS 6.2 User Guide

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Dell 6.2 manual Enabling Controller Discovery, Configuring DNS Resolution, Configuring Dhcp Server Communication with APs

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