To configure multiple BlackBerry® Administration Service instances or BlackBerry MDS Integration Service instances for high availability using DNS round robin, you must create a DNS record. The DNS record permits the clients of the BlackBerry Administration Service pool or BlackBerry MDS Integration Service pool to access the instances using a single DNS name. You must create the DNS record in the same domain as the computers that host the BlackBerry Administration Service instances or BlackBerry MDS Integration Service instances.

1. Log in to the DNS server.
2. In the DNS management console, access the forward lookup zone that you want to add the BlackBerry Administration Service instance or BlackBerry MDS Integration Service instance to.
3. To create a new host, type the following information:
   • In the Name field, type the name of the BlackBerry Administration Service pool or BlackBerry MDS Integration Service pool that you want to use.
   • In the IP Address1 field, type the IP address of the computer that you want to host a BlackBerry Administration Service instance or BlackBerry MDS Integration Service instance on.
   • Select the Create associated pointer (PTR) record check box.
4. Repeat step 3 for each BlackBerry Administration Service instance or BlackBerry MDS Integration Service instance that you want to install. When you add entries to the same pool, you must use the same pool name for all BlackBerry Administration Service instances or BlackBerry MDS Integration Service instances.

After you finish: To remove a BlackBerry Administration Service instance or BlackBerry MDS Integration Service instance from a pool, delete the entry for the IP address of the BlackBerry Administration Service instance or BlackBerry MDS Integration Service instance from the DNS server.