IBM Support

OA51857: IST1821I MESSAGE IS BEING ISSUED INCORRECTLY

A fix is available

Subscribe

You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • An inop of a single TG is causing other RTP PUs on other TGs
    to be scheduled for path switch incorrectly.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * All users of the IBM Communications Server                   *
    * z/OS Version 2 Release 1  and Version 2 Release 2            *
    * HPR                                                          *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * Excessive path switches occuring for PSRETRY:                *
    * IST1821I PATH SWITCH REASON: AUTO PATH SWITCH FOR PSRETRY    *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Apply PTF.                                                   *
    ****************************************************************
    The problem is summarized as follows:
    1) DWINOP=YES is specified on both sides of an EE connection.
    The general rule is to only specify this on one end of the
    connection to avoid EE dial contention which results in EE
    connection setup failures.
    2) One end of the EE connection defined both a switched PU and
    allowed dynamic EE PUs to be defined (model EE PU defined).  The
    switched PU definition specified a TGP paramater, but the EE
    model PU does not.
    3) The EE connection was connecting and disconnecting due to the
    DWINOP contention identified in step 1.  This lead to both TG21
    and TG22 being activated and deactivated, randomly being
    assigned either the switched PU definition or by using a dynamic
    PU generated from the EE model PU definition.
    4) When a TG is activated and the TG characteristics are
    detected by the VTAM TRS component to be changed, this results
    in VTAM scheduling all RTP pipes to perform a HPR path switch to
    pick up the new TG characteristics.
    5) Because of the DWINOP contention, and the mismatched TGP (TG
    characteristics) in the model EE PU and predefined switched EE
    PU do not match, this led to excessive HPR pipe switches
    occuring on this node.
    
    IST1494I  PATH SWITCH STARTED FOR RTP CNRxxxxx TO
    xxxxxxxx.xxxxxxxx
    IST1821I  PATH SWITCH REASON: AUTO PATH SWITCH FOR PSRETRY
    IST314I  END
    

Problem conclusion

  • ISTTRTTG - Updated to perform HPR path switches for TG
    characteristic changes only when the PSRETRY IMMEDIATE start
    option is specified.
    ISTTROMT - Commentary change only.
    ISTRPCRT - Included for maintenance pursposes.
    

Temporary fix

Comments

APAR Information

  • APAR number

    OA51857

  • Reported component name

    VTAM V4 MVS/ESA

  • Reported component ID

    569511701

  • Reported release

    210

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    YesHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2017-01-04

  • Closed date

    2017-01-12

  • Last modified date

    2017-04-03

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

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

    UA83778 UA83779

Modules/Macros

  • ISTRPCRT ISTTROMT ISTTRTTG
    

Fix information

  • Fixed component name

    VTAM V4 MVS/ESA

  • Fixed component ID

    569511701

Applicable component levels

  • R210 PSY UA83778

       UP17/03/04 P F703 ¢

  • R220 PSY UA83779

       UP17/03/04 P F703 ¢

Fix is available

  • Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.

[{"Business Unit":{"code":"BU054","label":"Systems w\/TPS"},"Product":{"code":"SG19M","label":"APARs - z\/OS environment"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"210","Edition":"","Line of Business":{"code":"","label":""}},{"Business Unit":{"code":"BU054","label":"Systems w\/TPS"},"Product":{"code":"SSCY4DZ","label":"DO NOT USE"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"210","Edition":"","Line of Business":{"code":"","label":""}}]

Document Information

Modified date:
03 April 2017