Sysplex subplexing
In large sysplex environments, there can be strict security requirements to isolate access to certain VTAM nodes or TCP/IP stacks within the sysplex. A z/OS Communications Server function, which is called subplexing, provides this type of support. It enables the user to implement automatically controlled access to subplex groups.
As mentioned, the subplexing support is also for VTAM nodes. However, this chapter describes subplexing ...

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