Predefined LU alias support

CICS® supports the use of a predefined LU alias for CICS terminals and workstations that are explicitly defined and those that are autoinstalled.

You can also use a predefined LU alias for CICS regions that communicate using CICS intersystem communication. You enable predefined alias support by specifying LUALIAS=alias on any cross-domain resource (CDRSC) that requires a specific alias. A terminal or APPC synclevel 1 workstation that is defined to CICS on an explicit resource definition (that is, it is not autoinstalled) and is in a different network, requires a CDRSC definition with a specific alias on the LUALIAS parameter. This alias overrides the dynamic generation of an alias where LUAPFX is specified on the CICS region's APPL statement. To ensure that CICS can match the SNA LU alias with the installed terminal definition, the LUALIAS value must match the NETNAME specified on the CICS TERMINAL resource definition.

An LUALIAS option in the CDRSC is effective if the resource comes from another SNA domain. That is, it is not used if the resource comes from the same MVS™ image, but is used if the resource comes from another MVS image regardless of whether it is from the same sysplex, another sysplex in the same network, or from a different sysplex. If an LU alias is predefined, a dynamic LU alias is not generated.

When to use predefined LU alias

Use predefined LU alias where you do not have dynamic LU alias enabled or where you want to override dynamic LU aliases.

• Dynamic LU alias is in operation in a CICS region and your terminals or workstations are explicitly defined on CICS terminal resource definitions with explicit terminal identifiers. In this case, you use predefined LU aliases to override the generation of dynamic LU aliases, which CICS fails to match with any installed resource definition.
• Dynamic LU alias is not in operation in a CICS region, to avoid any conflict with duplicate network names.