LI77276: MAX BTU SIZE ON INCOMING LINK INCORRECT IN XID

Subscribe

You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • Communications Server for AIX and Linux
    ---------------------------------------
    Link failure with the following message in the sna.err log:
    
    2011-09-11 09:13:31 EST 1536-14(2-10) E (snatest)
    GDLC detected LS outage.
    LS     = TESTLS
    Outage = frame overflow (-9999)
    

Local fix

  • A workaround is to configure the link BTU size to be equal to or
    larger than the port BTU size.
    

Problem summary

  • USERS AFFECTED:
    All using LLC links.
    
    PROBLEM DESCRIPTION:
    When an incoming connection matches a predefined link station
    definition, the BTU size sent on the XID is taken from the port
    definition, but the BTU size sent to the DLC is taken from the
    link definition. If the link setting is smaller than the port
    setting, that could allow a condition where the remote side can
    send a frame larger than the DLC will accept, causing a frame
    overflow condition which causes the link to fail.
    
    LOCAL FIX:
    A workaround is to configure the link BTU size to be equal to
    the port BTU size.
    
    PROBLEM SUMMARY:
    The wrong configuration setting is being used in XID
    negotiation.
    

Problem conclusion

  • Code has been modified to correctly set the maximum BTU size on
    the transmitted XIDs.
    
    This problem also exists in CS Linux but does not cause the
    link to fail. The code has also been corrected in CS Linux.
    

Temporary fix

  • sna_v5router64
    

Comments

APAR Information

  • APAR number

    LI77276

  • Reported component name

    CS LINUX ON ZSE

  • Reported component ID

    5724I3400

  • Reported release

    623

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2013-04-26

  • Closed date

    2013-04-26

  • Last modified date

    2013-04-26

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

    IV08617

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

Fix information

  • Fixed component name

    CS LINUX ON ZSE

  • Fixed component ID

    5724I3400

Applicable component levels

  • R623 PSY

       



Rate this page:

(0 users)Average rating

Document information


More support for:

Communications Server for Linux on zSeries

Software version:

623

Reference #:

LI77276

Modified date:

2013-04-26

Translate my page

Machine Translation

Content navigation