IBM AIX 7.3 – Common Problem 61 – Diagnosis and Fix

📖 ~1 min read

Table of contents

1. Symptom & Impact
2. Environment & Reproduction
3. Root Cause Analysis
4. Quick Triage
5. Step-by-Step Diagnosis
6. Solution – Primary Fix
7. Solution – Alternative Approaches
8. Verification & Acceptance Criteria
9. Rollback Plan
10. Prevention & Hardening
11. Related Errors & Cross-Refs
12. References & Further Reading

Symptom & Impact

EtherChannel ent on AIX 7.3 reports frequent link UP/DOWN in errpt.

Environment & Reproduction

Backup adapter takeover under LACP partner flap or switch port misconfig.

Root Cause Analysis

Switch LACP timer mismatch (fast vs slow) or duplex mismatch on member.

Quick Triage

Run entstat -d entX | grep -E ‘Link|Active’ to see active port.

Step-by-Step Diagnosis

Use lsattr -El entX and netstat -v entX for LACP statistics.

Solution – Primary Fix

Align LACP mode with switch using chdev -l entX -a mode=8023ad -P.

Solution – Alternative Approaches

Switch to mode=standard with backup adapter as interim fix.

Verification & Acceptance Criteria

entstat shows stable Active port for >24h without takeovers.

Rollback Plan

Revert to single adapter (ifconfig enX) until link is stable.

Prevention & Hardening

Match LACP timers with network team and pin switch ports.

Related Errors & Cross-Refs

ETHERCHANNEL_PRIMARY_FAIL, NIC reset events in errpt.

Related tutorial: View the step-by-step tutorial for aix-7.3.

View all aix-7.3 tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

AIX EtherChannel and LACP configuration guide.