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This requirement is addressed by z/OS Connect V3.0.56 / APAR PH45219: https://www.ibm.com/support/pages/apar/PH45219
For further details, refer to the “IPIC High Availability”topic in the z/OS Connect Documentation:
z/OS Connect (OpenAPI 2) https://www.ibm.com/docs/en/zos-connect/zosconnect/3.0?topic=sors-cics-ipic-high-availability
z/OS Connect (OpenAPI 3) https://www.ibm.com/docs/en/zos-connect/zos-connect/3.0?topic=cics-configuring-ipic-high-availability
On Nov. 7, 2018, this was referenced in 119249 with the following text:
In the short term we aim to deliver RFE 123515: http://www.ibm.com/developerworks/rfe/execute?use_case=viewChangeRequest&CR_ID=123515, which, when used in conjunction with Sysplex Distributor and Port Sharing both in front and behind z/OS Connect EE, will provide a robust and scalable configuration to CICS suitable for the majority of High Availability use cases.
Posted by IBM_Development (IBM) on 7 Nov 2018
Yet both RFEs remain in Uncommitted Candidate status?
The issue appears to remain outstanding.
I can see this as a very useful feature, allowing traffic flows to be "restored" to an original path in scenarios where an address space previously failed, traffic routed away from it, and then subsequently restored.