π ~1 min read
Table of contents
Symptom & Impact
Traffic drops intermittently when lagg members oscillate in active state.
Environment & Reproduction
Seen with mismatched switch LACP settings or unstable physical links.
Root Cause Analysis
Aggregation policy and upstream switch negotiation are inconsistent.
Quick Triage
Validate interface errors, switch side config, and selected lagg mode.
Step-by-Step Diagnosis
Correlate interface counters with failover events and switch logs.
Solution – Primary Fix
Align lagg mode and switch configuration, then reset unstable members.
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Solution – Alternative Approaches
Use active-backup with deterministic primary for sensitive workloads.
Verification & Acceptance Criteria
No packet loss spikes during link failover and steady-state operation.
Rollback Plan
Return to single uplink path while root cause remediation continues.
Prevention & Hardening
Standardize network templates and monitor link error budgets.
Related Errors & Cross-Refs
Can overlap with CARP failover storms in dual-redundancy designs.
Related tutorial: View the step-by-step tutorial for FreeBSD 13.
View all FreeBSD 13 tutorials on the Tutorials Hub β
Browse all common problems & solutions on the Tutorials Hub.
References & Further Reading
lagg(4), ifconfig(8), and switch vendor LACP best practices.
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