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IV53704: ETHERCHANNEL FAILS TO BACKUP WHEN ADAPTER IS REMOVED APPLIES TO AIX 6100-08

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

  • An etherchannel in 802.3ad mode that also has a backup
    adapter plus address to ping set up will usually fail
    over to the backup adapter when one of the adapters is
    removed using DAM.  Even if alternate MAC address is set
    and being used, the removal can often trigger a loss of
    connectivity longer than 3 seconds which results in the
    etherchannel failing over to the backup adapter.
    
    It has also been observed that a fail over to backup can
    occur when adding an adapter via DAM.
    

Local fix

  • Setting the AIX etherchannel timeout to short helps
    because it causes the switch to send LACP packets every
    second.  Then the address to ping settings can be
    lengthened to 8 or 10 seconds and this tends to avoid
    the fail over to the backup but there is still packets
    being lost until the switch discovers the adapter has
    been removed.
    

Problem summary

  • An etherchannel in 802.3ad mode may cause disrupt in network
    communication when a port is removed from the aggregation
    using DAM.
    

Problem conclusion

  • Etherchannel driver is modified to avoid LACP re-negotiation
    when port under aggregation is removed.
    

Temporary fix

Comments

  • 6100-08 - use AIX APAR IV53704
    6100-09 - use AIX APAR IV60929
    6100-09 - use AIX APAR IV60929
    7100-02 - use AIX APAR IV64208
    7100-03 - use AIX APAR IV60933
    7100-04 - use AIX APAR IV60949
    

APAR Information

  • APAR number

    IV53704

  • Reported component name

    AIX 610 STD EDI

  • Reported component ID

    5765G6200

  • Reported release

    610

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Submitted date

    2014-01-06

  • Closed date

    2014-05-25

  • Last modified date

    2016-05-10

Fix information

  • Fixed component name

    AIX 610 STD EDI

  • Fixed component ID

    5765G6200

Applicable component levels

  • R610 PSY U867297

       UP15/01/18 I 1000

PTF to Fileset Mapping



Document information

More support for: AIX Standard Edition

Software version: 610

Operating system(s): AIX

Reference #: IV53704

Modified date: 10 May 2016