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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 to be conducted. Although a certain amount of negotiation is performed between two nodes to arrive at a compatible subset of logmode parameters, all GoalNet participants should use identical logmode parameters.
A special logmode, SNASVCMG, is used by the underlying IBM code to establish a conversation for the purpose of establishing the other conversations. SNASVCMG must not be changed from its IBM‑provided values.
Logmode definitions are combined into a logmode table. Each application ID then specifies one logmode table from which all logmode entries will be selected. Both the logmode table and the default logmode are specified in the application ID definition. These values can be modified by the VTAM operator command.
The logmode table must be assembled, using VTAM‑supplied MACRO libraries, and link‑edited into your SYS1.VTAMLIB data set or its equivalent. Do not modify the supplied values unless you are sure that you know what you are doing. The SNASVCMG logmode is provided by IBM and is used by their internal protocols when sessions are established. If you modify the SNASVCMG logmode, GoalNet will probably not work.
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