Users Guide

Controller discovery using a DHCP Server
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. The APs identify
themselves with a vendor class identifier set to DellAP in their DHCP requests. When the DHCP server
responds to a 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 1148 or refer to the documentation included with your server.
Enable DHCP to Provide APs with IP Addresses
Each AP requires a unique IP address on a subnetwork that has connectivity to a controller. It is recommended
you use the Dynamic Host Configuration Protocol (DHCP) to provide IP addresses for APs; the DHCP server
can be an existing network server or an controller configured as a DHCP server.
If you do not enable DHCP, each AP must be manually configured with an IP address through the AP provisioning
profile. For details, see .
You can use an existing DHCP server in the same subnetwork as the AP to provide the AP with its IP
information. You can also configure a device in the same subnetwork to act as a relay agent for a DHCP server
on a different subnetwork. (Refer to the vendor documentation for the DHCP Server or relay agent for
information.)
If an AP is on the same subnetwork as the master controller, you can configure the controller as a DHCP server
to assign an IP address to the AP. The controller must be the only DHCP server for this subnetwork.
In the WebUI
1. Navigate to the Configuration > Network > IP > DHCP Server window.
2. Select the Enable DHCP Server checkbox.
3. In the Pool Configuration section, click Add.
4. Enter information about the subnetwork for which IP addresses are to be assigned. Click Done.
5. If there are addresses that should not be assigned in the subnetwork:
a. Click Add in the Excluded Address Range section.
b. Enter the address range in the Add Excluded Address section.
c. Click Done.
6. Click Apply at the bottom of the window.
In the CLI
(host)(config)# ip dhcp excluded-address ipaddripaddr2
(host)(config)# ip dhcp pool name
default-router ipaddr
dns-server ipaddr
domain-name name
network ipaddrmask
(host)(config)# service dhcp
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