Deployment Guide

Create New DHCP Options
When you configure DHCP for Extreme Campus Controller, create 078 SLP DA Option for access points
on a Centralized site.
Note
You can create the DHCP options at the scope level or at the server IPv4 node. When you
configure DHCP options at the server node, the options apply to all scopes under that node.
Important
For AP deployments in remote locations where access points and controllers may need to be
discovered and connected over firewalls, a best practice is to leverage DNS or DHCP Option
60/43 methods for zero-touch-provisioning discovery. These methods provide direct
connectivity to the defined IP address. DHCP Option 78, which refers to the controller as a
Service Location Protocol – Directory Agent (SLP-DA), requires the exchange of SLP protocol
between the AP and the appliance at the core, necessitating that UDP 427 be allowed by any
firewall in the path. For such installations, discovery over DHCP Option 78 assist is not
recommended.
When using SLP, for an AP to establish connection with a controller, it must first exchange
SLP Directory Agent registration before IPSEC establishment with the eventual controller.
That means that SLP UDP 427 must be open along the path. Further issues can occur if
Network Address Translation (NAT) is involved. While this method is popular and widely
deployed within a homogenous campus, it may result in inadvertent complications for remote
connections. Therefore, it should not be used in favor of an alternate method (DHCP 60/43 ,
DNS, or static override).
1. From the IPv4 node, right-click and select Set Predefined Options.
The Predefined Options and Values dialog displays.
2. Option Class is DHCP Standard Options.
3. Select Add.
The Option Type dialog displays.
4. Refer to the related information for each option.
Related Topics
Creating Option 78 on page 28
Configuring Option 43 on page 32
Creating Option 78
To create Option 78 for a Centralized site:
1. Go to Start > Administrative Tool > DHCP.
2. Right-click the server node, and select Set predefined options.
3. Select Add, and configure the following parameters:
Name
Provide a name for the option, for example SLP DA.
Data Type
Set the data type to Byte and select the Array check box.
Code
Configuring
DHCP on Windows Server 2012 R2 Configuring DHCP, NPS, and DNS Services
28 Extreme Campus Controller Deployment Guide for version 5.46.03