CentOS Stream 10 – Common Problem 087 – 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

NetworkManager bond fails LACP negotiation on CentOS Stream 10 disrupts services and slows incident response until the root cause is resolved.

Environment & Reproduction

Bond stays in down state because LACP rate mismatches with the switch configuration.

nmcli con show bond0
cat /proc/net/bonding/bond0

Root Cause Analysis

Misalignment between network configuration and CentOS Stream 10 defaults causes the failure path described above.

Quick Triage

Confirm package state, service status, and recent changes before deeper diagnostics.

systemctl status
rpm -qa | grep -i 
journalctl -p err -b --no-pager | tail -100

Step-by-Step Diagnosis

Capture detailed logs, configuration deltas, and runtime state to isolate the failing component.

ethtool eth0
cat /proc/net/bonding/bond0
nmcli -f all dev show bond0

Solution – Primary Fix

Apply the targeted configuration change and restart the relevant services to restore expected behavior.

sudo nmcli con mod bond0 bond.options 'mode=802.3ad,miimon=100,lacp_rate=fast'
sudo nmcli con down bond0 && sudo nmcli con up bond0
sudo systemctl restart NetworkManager

Solution – Alternative Approaches

Fall back to active-backup mode if switch LACP is misconfigured.

Verification & Acceptance Criteria

Validate the fix with deterministic checks and ensure no regressions in dependent services.

cat /proc/net/bonding/bond0
ip -br link

Rollback Plan

Revert configuration and restart services to return to the previous known-good state.

nmcli con mod bond0 bond.options 'mode=active-backup,miimon=100'
nmcli con up bond0

Prevention & Hardening

Coordinate LACP parameters with network team and lock config in Ansible.

Related Errors & Cross-Refs

Related: 802.3ad, lacp_rate, miimon; see also adjacent topics in the CentOS Stream 10 common problems series.

Related tutorial: View the step-by-step tutorial for centos-stream-10.

View all centos-stream-10 tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

CentOS Stream documentation, Red Hat upstream guides, and CentOS Stream 10 release notes covering this subsystem.