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IV97588: ETHERCHANNEL LINK PORT IN LACP MODE MAY NOT RECOVER APPLIES TO AIX 7200-01 17/09/29 PTF PECHANGE

A fix is available

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You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • **************************************************************
    * USERS AFFECTED:
    * Systems running the AIX 7200-01 Technology Level
    * with devices.common.IBM.ethernet.rte at the 7.2.1.1 level.
      **************************************************************
    * ERROR DESCRIPTION:
    * In recent Service Packs, for etherchannel devices in
    * IEEE802.3ad mode (LACP mode), if a link port goes down or is
    * disconnected, after it comes back etherchannel may never be
    * able to renegotiate LACP on that port again.
    *
    * There is a discrepancy in the protocol used between the
    * server and switch that prevents the port from being
    * re-aggregated.
    *
    * If this issue occurs, it can be resolved temporarily by
    * reconfiguring LACP mode on the etherchannel adapter.  This
    * will allow LACP to be renegotiated on the port for now,
    * though the issue could reoccur later if the fix is still not
    * applied.
    *
    * On VIOS with etherchannel (entY) under SEA (entX), use:
    * $ oem_setup_env
    * # /usr/lib/methods/ethchan_config -c -p entX entY mode
    * standard
    * # /usr/lib/methods/ethchan_config -c -p entX entY mode 8023ad
    *
    * On AIX with etherchannel (entY), use:
    * # /usr/lib/methods/ethchan_config -c entY mode standard
    * # /usr/lib/methods/ethchan_config -c entY mode 8023ad
    *
    * Note: This change may cause temporary network interruption
    * over this etherchannel adapter if the first port in the
    * etherchannel is the one that is down.
    *
      **************************************************************
    * RECOMMENDATION:
    * Install APAR IV97588.
    * Prior to fix availability, an interim fix is available from
    * either
    * ftp://aix.software.ibm.com/aix/ifixes/iv97588/
    * https://aix.software.ibm.com/aix/ifixes/iv97588/
    * Installation of the ifix requires a reboot.
      **************************************************************
    

Local fix

  • LOCAL FIX:
    If this issue occurs, it can be resolved temporarily by
    reconfiguring LACP mode on the etherchannel adapter.  See
    Error Description for details.
    

Problem summary

  • At the latest levels, pulling/reconnecting a cable from an
    LACP etherchannel port may lead to the port staying
    permanently out-of-sync.
    

Problem conclusion

  • Modified etherchannel driver to fix COLLECTING bit
    enablement in the LACP negotiation process.
    

Temporary fix

  •   *********
      * HIPER *
      *********
    

Comments

APAR Information

  • APAR number

    IV97588

  • Reported component name

    AIX V7.2

  • Reported component ID

    5765CD200

  • Reported release

    720

  • Status

    CLOSED PER

  • PE

    YesPE

  • HIPER

    YesHIPER

  • Submitted date

    2017-06-29

  • Closed date

    2017-06-29

  • Last modified date

    2017-09-29

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

    IV97135

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

Fix information

  • Fixed component name

    AIX V7.2

  • Fixed component ID

    5765CD200

Applicable component levels

  • R720 PSY U873456

       UP17/09/21 I 1000 Ž

PTF to Fileset Mapping



Document information

More support for: AIX 7.2 Enterprise Edition

Software version: 720

Operating system(s): AIX

Reference #: IV97588

Modified date: 29 September 2017


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