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IBM z/OS V2R1 Communications Server TCP/IP Implementation Volume 1: Base Functions, Connectivity, and Routing by Maulide Xavier, Rutsakon Techo, Georg Senfleben, Micky Reichenberg, Gilson Cesar de Oliveira, Uma Maheswari Kumaraguru, Rufus P. Credle Jr.

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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, 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 only describes subplexing ...

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