Debugging LACP Instability in a Transparent OPNsense Bridge

Short summary

Debugging LACP instability in a transparent OPNsense bridge requires distinguishing between clean outages and partial member failures that masquerade as network degradation. LACP aggregates mask physical link problems because traffic hashes across members—if one member becomes marginal, only certain flows stall while others work. Check OPNsense system logs for link state flapping and member flag changes (ACTIVE, COLLECTING, DISTRIBUTING) to identify the failing interface.

• •LACP partial failures hide as general network degradation, not clean outages
• •Flow hashing means bad members only affect certain traffic while the aggregate still partially works
• •Diagnose by checking OPNsense logs for link state flapping and member flag changes

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