Network load balancing

To avoid being dependent on a single CICS® router region, you should consider using more than one router region to share the workload from the network. There are several techniques that you can use to balance the workload between your router regions:
Sysplex Distributor
Sysplex Distributor is a feature of z/OS® Communications Server that provides for balancing of IP packets across multiple IP stacks. For more information about Sysplex Distributor, see z/OS Communications Server: IP Configuration Guide, SC31-8775.
Virtual IP Addressing (VIPA)
Dynamic VIPA is a feature of z/OS Communications server that provides non-disruptive rerouting around a failing network adapter. For more information about VIPA, see z/OS Communications Server: IP Configuration Guide, SC31-8775.
DNS approach
DNS connection optimization balances IP connections in an z/OS sysplex IP domain, based on feedback from MVS™ WLM about the health of the registered applications. It is still supported for CICS use. For information about DNS/WLM support, see z/OS Communications Server: IP Migration, GC31-8773.
Port Sharing
TCP/IP port sharing provides a simple way of spreading HTTP requests over a group of CICS router regions running in the same z/OS image. CICS TCPIPSERVICEs in different regions are configured to listen on the same port, and TCP/IP is configured with the SHAREPORT option. The TCP/IP stack then balances connection requests across the listeners. For more information about TCP/IP port sharing, see z/OS Communications Server: IP Configuration Reference, SG24-5466.