LI77309: LLC LINK FAILS DURING BONDED ETHERNET FAILOVER

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You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • When using LLC protocol with a bonded ethernet adapter and the
    underlying primary adapter fails so the backup adapter takes
    over, a link station using this adapter will fail.
    

Local fix

  • restart the link
    

Problem summary

  • USERS AFFECTED: All users of LLC on s390x systems.
    
    PROBLEM DESCRIPTION:
    When using LLC protocol with a bonded ethernet adapter and the
    underlying primary adapter fails so the backup adapter takes
    over, a link station using this adapter will fail.
    
    PROBLEM SUMMARY:
    A previous fix, LI75483, dealt with a problem with re-ordering
    frames before processing by the LLC driver. This re-ordering is
    done by using an internal sequence numbering method implemented
    by zOS on the ethernet frames. This will not be visible on a
    packet trace.
    
    When the bonded ethernet failover occurs, the sequence numbering
    changes. This causes Communications Server to ignore any frames
    that would appear to be out of sequence, until the next expected
    sequence number frame is received.
    

Problem conclusion

  • Code has been modified so that when a bonding failover occurs,
    the next sequence number received will be accepted as the new
    starting point. Also, the following message will be logged in
    /var/log/messages:
       SNA LLC2 Ethernet bonded port #xx failover.
    

Temporary fix

Comments

APAR Information

  • APAR number

    LI77309

  • 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:

    LI76847

  • 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

       



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Document information


More support for:

Communications Server for Linux on zSeries

Software version:

623

Reference #:

LI77309

Modified date:

2013-04-26

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