🟠 High   ⏱ 5–30 min  Last verified: 20 May 2026
Affected versions: Oracle Linux 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 remains on failed slave too long, causing packet loss during link events.

Environment & Reproduction

Observed on active-backup bonds with default monitoring settings.

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

Root Cause Analysis

No miimon or ARP monitoring means bond driver detects faults too slowly.

Quick Triage

Inspect bond runtime state and NetworkManager profile.

systemctl status NetworkManager
cat /proc/net/bonding/bond0
firewall-cmd --state
getenforce
journalctl -u NetworkManager -n 60 --no-pager

Step-by-Step Diagnosis

Check monitoring intervals and last failover reason in logs.

nmcli connection show bond0 | grep -i bond.options
ethtool eth0 | grep -i Link
journalctl -k -n 100 --no-pager | grep -i bond
Illustrative mockup for oracle-linux-10 — bond_failover_delay
Bond failover delay due to missing miimon — Illustrative mockup — Progressive Robot

Solution – Primary Fix

Enable miimon and set failover-friendly delay values.

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sudo nmcli connection modify bond0 bond.options 'mode=active-backup,miimon=100,updelay=200,downdelay=200'
sudo nmcli connection up bond0
sudo systemctl restart NetworkManager
Illustrative mockup for oracle-linux-10 — bond_failover_improved
Healthy failover after miimon tuning — Illustrative mockup — Progressive Robot

Solution – Alternative Approaches

Use ARP monitoring in routed environments where link state is insufficient.

sudo nmcli connection modify bond0 bond.options 'mode=active-backup,arp_interval=100,arp_ip_target=10.0.0.1'

Verification & Acceptance Criteria

Failover completes within defined SLO and traffic remains stable.

cat /proc/net/bonding/bond0
ping  -c 20

Rollback Plan

Restore previous bond options from backup profile.

sudo nmcli connection reload
sudo nmcli connection up bond0

Prevention & Hardening

Template proven bonding options across all HA nodes.

nmcli -g bond.options connection show bond0

Related to LACP timer mismatches and switch-side port-channel misconfiguration.

Related tutorial: View the step-by-step tutorial for oracle-linux-10.

View all oracle-linux-10 tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

RHEL bonding and NetworkManager high-availability network docs.

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