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.