Using multiple VIPAs

There are several advantages to having multiple VIPAs.

You can provide different VIPAs to different vendors, which eases the tasks of network management, problem determination, and firewall administration.
You can define multiple connection networks.
There is more potential for flexibility in making IP routing decisions.

Requirement: All local Enterprise Extender VIPAs must belong to the same TCP/IP stack. VTAM® establishes affinity to a single TCP/IP stack when the first EE line is activated; VTAM cannot use multiple stacks concurrently.