OW23760: CONNECTION NETWORK DYNAMIC PU DISPLAYS MAXDATA=265 IN MSGIST956I.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• When a dynamic PU (created for an XCA connection network) is
  displayed the MAXDATA value in message IST956I is incorrect.
   MAXDATA= on a switched PU has no meaning in this environment
  because the maximum data that any node can send/receive is
  determined by the network that it is connected to rather than
  the boundary node that it is connecting through, such as an
  XCA or NCP (Frame Relay).
   IST956I should give the actual value being used if it is
  known, and if it is not known then no MAXDATA should be
  displayed.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All using connection networks.               *
  ****************************************************************
  * PROBLEM DESCRIPTION: MSGIST956I has incorrect value for      *
  *                      MAXDATA when displayed for a dynamic    *
  *                      connection network PU.  A value of 265  *
  *                      is shown, but network traces reveal the *
  *                      actual value being used is much larger. *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  When a display is done for a dynamic connection network PU the
  MAXDATA value in message IST956I is pulled out of the PU's RDTE.
  However, for LAN connected resources, the MAXDATA value coded
  in the RDTE is ignored.  MAXDATA is instead learned from the
  connection network.
  

Problem conclusion

• Display processing for IST956I now checks to see if an NCB is
  known for this PU, and if it is the value from the NCB is used
  in the message.  If no NCB is associated with the PU then the
  MAXDATA= portion of the message is left off completely since the
  value in the PU RDTE is misleading.  This is already the
  practice when this message is displayed for a link station.
  
  For an XCA connection network dynamic PU we do indeed learn the
  value for MAXDATA and have access to it via the NCB pointer, so
  for a display of this type of dynamic PU message IST956I will
  have MAXDATA on it.  For an NCP Frame Relay connection network
  dynamic PU we do not have access to the real MAXDATA value
  (there is no NCP pointer in the PU RDTE) so a display of that
  type of dynamic PU will not show MAXDATA in message IST956I.
  
  VTAM Messages and Codes (SC31-6546-00) must be updated for
  IST956I to indicate that another valid form of the message is
  also PU SAP=sapaddress MAC=macaddress (with no MAXDATA=n).  This
  form will be used when no valid MAXDATA can be displayed.
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

  UW34761 UW34762 OW35904 VM61908 DY44959

Modules/Macros

• ISTNOCDH ISTNOCI2
  

Fix information

• Fixed component name

  VTAM V4 MVS/ESA

• Fixed component ID

  569511701

Applicable component levels

• R201 PSY UW34761

     UP97/01/10 P F701

• R301 PSY UW34762

     UP97/01/10 P F701

Fix is available

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