Under the IBM implementation of LU 6.2 (APPC), each conversation is based on a logmode. A logmode is a set of parameters that define how the conversation is conducted. Although a certain amount of negotiation is performed between two nodes to arrive at a compatible subset of logmode parameters, all GoalNet participants use identical logmode parameters.
The underlying IBM code uses a special logmode, SNASVCMG, to establish a conversation to establish the other conversations. SNASVCMG must not be changed from its IBM‑provided values.
The logmode definitions are combined into a logmode table. Each application ID then specifies one logmode table from which all logmode entries are selected. Both the logmode table and the default logmode are specified in the application ID definition. The VTAM operator command modifies these values.
The logmode table must be assembled, using the VTAM‑supplied MACRO libraries, and link‑edited into your SYS1.VTAMLIB data set or its equivalent. Only modify the supplied values if you are sure that you know what you are doing. IBM provides the SNASVCMG logmode and their internal protocols use it when sessions are established. If you modify the SNASVCMG logmode, GoalNet probably does not work.
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