Point to note:
When installed RDS 2012 using the Default Method, the RDWEB and Connection Broker will be installed. When creating RDSH farms, it is important to configure the Connection Broker to ensure that it does not conflict with the client or load balancer.
You will need to configure the following policy: ‘Use IP Address Redirection‘ must be disabled for all RDS in the farm. This policy can be accessed here: Computer Configuration | Administrative Templates | Windows Components | Remote Desktop Services |Remote Desktop Session Host | RD Connection Broker | Use IP Address Redirection
This should be configured either locally per server or by configuring a Group Policy Object and applying this to all servers in the farm.
If you have RDSH and RDWA roles configured on your servers you will need to use sub virtual services (SUBVS) for each service you want to configure.
Configure DNS For the RDSH Farm
Create a A Record for the RDSH FARM, this will be the Virtual IP (VIP) created as a virtual service on the Load Balancer.
Configuring the Kemp Load Balancer
Under the Virtual Services Tab Select Add New.
Enter the IP address for you RDSH Farm, enter the port 3389 for RDP. Enter the Service name to define this service. Select the protocol TCP.
Mode: Terminal Service or Source IP
Timeout: 6 Minutes
Scheduling Method: weighted Least Connection
Add the Session servers to the section Real Servers.
Once complete you will see RDSH Farm service under Virtual Services > View/Modify Services.