To change the protocol for the entire network, follow the instructions in Changing the protocol for a connection for each connection in the network. After you are done, you should consider what you want to do with the old configuration information, including TARGET statements, RACF® profiles in classes such as APPCLU, APPCSERV, and VTAMAPPL (if the old protocol was APPC/MVS) or SERVAUTH (if the old protocol was TCP/IP), and VTAM® configuration or TCP/IP configuration. You might choose to keep the old configuration information, so that you can switch to the old protocol if you have problems with the new protocol. Or you might choose to delete it all.