🟠 High   ⏱ 5–30 min  Last verified: 20 May 2026
Affected versions: CentOS Stream 10

📖 ~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

Bonded interface fails to activate at boot with no carrier reported.

Environment & Reproduction

Common after kernel upgrades or driver firmware updates on bonded NICs.

Root Cause Analysis

Slave interfaces have wrong connection.master or mismatched MII status.

Quick Triage

Run nmcli connection show and nmcli device status.

Step-by-Step Diagnosis

Inspect /proc/net/bonding/bond0 for slave states.

Illustrative mockup for centos-stream-10 — nm_bond_diag
Diagnostic view for networkmanager-bond-not-coming-up — Illustrative mockup — Progressive Robot

Solution – Primary Fix

Reassign slaves with nmcli connection modify and bring bond up.

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Illustrative mockup for centos-stream-10 — nm_bond_fix
Remediation steps for networkmanager-bond-not-coming-up — Illustrative mockup — Progressive Robot

Solution – Alternative Approaches

Switch bond mode to active-backup temporarily for diagnostic clarity.

Verification & Acceptance Criteria

ip link show bond0 shows up state and carrier is present.

Rollback Plan

Revert to previous bond config from /etc/NetworkManager/system-connections.

Prevention & Hardening

Pin bond options in configuration management and monitor mii_status.

Linked to switch port LACP and VLAN trunking issues.

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

NetworkManager bonding tutorial and team driver docs.

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