Keywords › IMSMSC Keyword—Determine MSC Security Level

IMSMSC Keyword—Determine MSC Security Level

Valid on z/OS.

Use the IMSMSC keyword to determine the level of security in effect for inbound transactions in an IMS Multiple Systems Coupling (MSC) environment. IMSMSC determines if transaction validation is performed and against what ACID.

Up to 20 MSC linknames can specified per TSS command.

This keyword has the following format:

TSS ADDTO(region acid) IMSMSC('MSC linkname(acid|+USER|+DEFAULT),...')

region acid

ACID associated with the IMS control region started task.

MSC linkname

The label on the MSNAME macro of the IMS Stage 1 Generation, associated with the incoming MSC transaction. Specify a linkname of ALL for all the previously unspecified linknames in the Stage 1 gen for this region to receive the associated link option.

null‑string

Indicates that no validation is performed

acid

Specifies the ACID used for validation. Ensure that the acid specified is not used for session signon (for example, through SOURCE restriction). An ACID used for an IMSMSC link and online session signon can have unpredictable effects.

+USER

Specifies that the userid signed on in the originating IMS region is propagated to the MSC receiving region. Ensure that the session user is allowed to sign on in both the originating and receiving regions, and that the transaction is allowed in both regions.

+DEFAULT

Specifies that the DEFACID assigned by the receiving region FACILITY control option is used for MSC transaction validation for the MSC linkname.

This keyword can be used with:

• The commands ADDTO, REMOVE, and REPLACE
• The ACID type User
• ACID(MAINTAIN) authority

Examples: IMSMSC keyword

This example associates region ACID IMS81 with:

• Explicit link name MSC1$2 with propagated user ID's from the originating region's terminal session
• Explicit link name MSC4$3 with fixed ACID LINK4$3
• Explicit link name MSC9$8 with the receiving region's facility DEFACID
• Implicit assignment of BADACID unable to sign on in the receiving region to any other link not explicitly defined in previously encountered links

  TSS ADD(IMS81) IMSMSC('MSC1$2(+USER), MSC4$3(LINK4$3), MSC9$8(+DEFAULT),
                        ALL(BADACID)')