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- Problem statement
- LU-LU session activation completes successfully with the issuance
of messages IST1774I, IST1775I, IST664I, IST889I, and IST314I at the
composite network node (CNN).
- Common symptoms
- The following messages are received:
IST1774I OPTIMAL CNN ROUTE NOT CHOSEN - ENTRY/EXIT SUBAREA MISMATCH
IST1775I CNN ENTRY SUBAREA = subarea CNN EXIT SUBAREA = subarea
IST664I REAL OLU=luname REAL DLU=luname
IST889I SID = sessid
IST314I END
- Probable cause
- An optimal CNN route exists and was not chosen during session
activation. Non-optimal routes might result because the topology of
the CNN is not known by the APPN topology and route selection process,
or because the route was calculated by a non-VTAM node that does not
support the use of subarea numbers in route calculation.
- User response
- Change the APPN TG characteristics. For more information about
APPN TG characteristics, See the z/OS Communications Server: SNA Network Implementation
Guide.
To suppress message group IST1774I,
CNNRTMSG=SUPPRESS can be specified as the start option value or modified
with the MODIFY VTAMOPTS command.
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