There are example configurations in the URL you refer to which are probably the most detailed ones in existance.
You are correct in assuming the trend is to move away from FEPs and subarea networking to APPN which is effectively what SNASwitch is, however there are still large numbers of legacy networks out there with FEPs which can generate considerable cost savings by using a WAN backbone for FEP - FEP traffic.
Also in networks with SNI connections, it is still necessary to have a FEP for address translation.
The SNASwitch Design Guide is at the following URL -
The reality is that the FEP support is being dropped by IBM, and that SNASw does offer nice capabilities of transporting SNA traffic in replacement of the FEP. Moving WAN backbone to IP is the most sensible path.
For the SNI issue, there are different ways of approaching it:
- IP based alternatives (TN3270, file transfer)
- use APPN extended border node (EBN), if possible if Enterprise Extender
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