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Questions to Determine

  • What LACP mode is configured on the server bond (active vs passive)?
  • What LACP mode is configured on the switch port-channel (active vs passive)?
  • Are both sides actually negotiating LACP, or has one side fallen back to static aggregation?
  • What does cat /proc/net/bonding/bond0 show for each slave's LACP partner info?
  • What hashing algorithm is the switch using for load distribution across the port-channel members?
  • Does the switch port-channel config match the server bond config (e.g., is the switch using src-mac only)?
  • Are the per-link traffic counters confirming the imbalance?
  • What is the LACP rate (slow/fast) on each side?
  • Could the traffic pattern (e.g., single large flow between two IPs) inherently hash to one link?
  • Are there any LACP error counters or negotiation failures logged?