Adding an additional Director to a pool is much like creating the initial pool. The topology must first be updated and published to reflect the change. Follow the steps described previously to import the existing topology in Topology Builder, and then use the following steps to include an additional pool member:
1. Expand the Director Pools node.
2. Right-click the Director pool name and select New Server.
3. Enter the fully qualified domain name of the new Director.
4. Either select Use all configured IP addresses or Limit service usage to selected IP addresses, and enter the IP addresses to be used by the Lync Server services.
5. Click OK when complete.
Now, publish the topology again and proceed with the Director ...