Microsoft® Lync Server 2010 Unleashed

Hardware Load Balancer

Using a hardware load balancer comes at a greater cost than DNS load balancing, but adds some flexibility and backward compatibility that an organization might require. Configuring the hardware load balancer is typically the most difficult part of an Edge Server deployment simply because of how flexible the load-balancing software generally is.

Some basic guidelines must be followed when using a hardware load balancer for Edge services:

• Each external-facing Edge service needs a publicly routable virtual IP address.

• Each Edge Server needs three publicly routable IP addresses assigned.

To summarize the requirements, if an organization deploys two Edge Servers with a hardware load balancer, it needs nine publicly routable ...