Bonding mode 4/802.3ad does not negotiate the same aggregator ID for all slave devices on RHEL5.4 or newer.

Solution Unverified - Updated -


  • The ethernet bonding driver operating in mode 4 (also known as 802.3ad or LACP mode) does not negotiate Link Aggregation Control Protocol (LACP) properly
  • Half of the interfaces enslaved to the bond device show a different LACP Aggregator ID value in the output of /proc/net/bonding/<bond device name> than the other half
  • The bond device does not properly aggregate the link across all enslaved interfaces


  • Red Hat Enterprise Linux 5 Update 4 (RHEL5.4)

  • Red Hat Enterprise Linux 5 Update 5 (RHEL5.5)

  • kernel 2.6.18-164 or newer
  • bonding driver operating in 802.3ad mode (mode4)

  • 4 or more network interfaces enslaved to bond

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