User's Manual

In the WebUI
1. Navigate to the Configuration > Wireless > AP Installation > Provisioning page. Select the remote AP
and click Provision.
2. Under Master Discovery enter the master DNS name of the controller.
3. Click Apply and Reboot.
For more information, see Provision the AP on page 635.
Backup Controller List
Using DNS, the remote AP receives multiple IP addresses in response to a host name lookup. Known as the
backup controller list, remote APs go through this list to associate with a controller. If the primary controller is
unavailable or does not respond, the remote AP continues through the list until it finds an available controller.
This provides redundancy and failover protection.
The remote AP loses the IP address information received through DNS when it terminates and receives the
system profile configuration from the controller. If the remote AP loses connectivity on the IPSec tunnel to the
controller, the RAP fails over from the primary controller to the backup controller. For this scenario, add the IP
address of the backup controller in the backup LMS and the IP address of the primary controller in the LMS
field of the ap-system profile. Network connectivity is lost during this time. As described in the section
Configuring Remote AP Failback on page 654, you can also configure a remote AP to revert back to the primary
controller when it becomes available. To complete this scenario, you must also configure the LMS IP address
and the backup LMS IP address.
For example, assume you have two data centers, data center 1 and data center 2, and each data center has one
master controller in the DMZ. You can provision the remote APs to use the controller in data center 1 as the
primary controller, and the controller in data center 2 as the backup controller. If the remote AP loses
connectivity to the primary, it will attempt to establish connectivity to the backup. You define the LMS
parameters in the AP system profile.
Figure 78 Sample Backup Controller Scenario
Configuring the LMS and backup LMS IP addresses in the WebUI
1. Navigate to the Configuration > Wireless > AP Configuration page.
2. Select either the AP Group or AP Specific tab. Click Edit for the AP group or AP name.
3. Under Profiles, select AP to display the AP profiles.
4. Select the AP system profile you want to modify.
Dell Networking W-Series ArubaOS 6.4.x | User Guide Remote Access Points | 653