IBM Support

IT33213: MQ Appliance link aggregation interface goes down when LLDP is enabled on network switch

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APAR status

  • Closed as program error.

Error description

  • After a firmware upgrade the following errors were reported for
    that belong to a link aggregation interface.
    The link on interface 'eth22' went down outside of an
    administrator initiated change window.
    The appliances are no longer replying to LLDP request causing
    the switch interfaces to go in error-disable mode.  After
    LLDP on those impacted interfaces on switch side brought the
    situation back to normal.

Local fix

  • Disable LLDP on the switch side for the affected interfaces.

Problem summary

  • ****************************************************************
    MQ appliance users with Link Aggregation Interface(s) configured
    using 10 GB Ethernet ports and upgrading to MQ version
    or or a firmware version which contains the fix for the
    APAR IT32866.
    Platforms affected:
    The 10 GB network card in the appliance has an integrated LLDP
    Engine. which processes LLDP frames and
    hence does not forward them to the operating system. However the
    appliance operating system requires the LLDP
    information when LCAP is configured. The APAR IT32866 upgrades
    NVM firmware for 10GB Ethernet. The new firmware enabled the
    LLDP agent on the 10 GB Network card by default and because of
    that LLDP frames were not forwarded to the OS, causing in
    failures in Link Aggregation.

Problem conclusion

  • ** Please note that following the inclusion of this APAR in the
    MQ release, the property name was changed for
    consistency with other IBM appliance products and versions. The
    change of property name in the 9.2 release is documented under
    IT33213. The text below is also updated accordingly to describe
    the version differences. **
    The IBM MQ Appliance code has been modified to provide an option
    to disable/enable LLDP hardware offload on the 10 GB network
    cards. If the connected network switch is LLDP-enabled and the
    interface is used in a link aggregation, then  LLDP hardware
    offload should be disabled on the 10GB interface(s) as described
    IBM MQ Appliance firmware only:
      On CLI   - link-layer-discovery-protocol (from config;
    ethernet [interface])
      On WebUI - Link Layer Discovery Protocol (from the interface
    settings page)
    IBM MQ Appliance / / 9.2.3 and later firmwares:
      On CLI   - lldp-hardware-offload (from config; ethernet
      On WebUI - Offload LLDP to hardware (from the interface
    settings page)
    The fix is targeted for delivery in the following PTFs:
    Version    Maintenance Level
    v9.1 LTS
    v9.2 LTS
    v9.x CD    9.2.3
    The latest available maintenance can be obtained from
    'WebSphere MQ Recommended Fixes'
    If the maintenance level is not yet available information on
    its planned availability can be found in 'WebSphere MQ
    Planned Maintenance Release Dates'

Temporary fix


APAR Information

  • APAR number


  • Reported component name


  • Reported component ID


  • Reported release


  • Status


  • PE




  • Special Attention

    NoSpecatt / Xsystem

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

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

Fix information

  • Fixed component name


  • Fixed component ID


Applicable component levels

[{"Line of Business":{"code":"LOB36","label":"IBM Automation"},"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SS5K6E","label":"IBM MQ Appliance"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"915"}]

Document Information

Modified date:
13 May 2021