← Problem Library
Network L5 NETWORK-399 · 17 min

A first-hop redundancy group fails over the gateway IP while one NAC or security system still authorizes the old active member based on switch identity during a staged decommission

Gateway continuity hides an adjacent policy engine that keys off the old box. The service still works through the primary path, but one dependency only fails when the old component is finally drained away.

NetworkFoundation OpsLevel 5Free17 min
Scenario

Gateway continuity hides an adjacent policy engine that keys off the old box. The service still works through the primary path, but one dependency only fails when the old component is finally drained away.

What to check first
  • Identify the primary failure signal in the Gateway Failed Over, Authorization Stayed with the Old Active scenario.
  • Separate visible symptoms from the underlying technical dependency.
  • Describe the safest recovery path and the follow-up prevention work.
Checking checklist
  1. Summarize the current impact and the last known change.
  2. Collect direct evidence from logs, runtime state, and configuration before changing anything.
  3. Separate immediate recovery from permanent prevention work.
Recovery and prevention

Choose the smallest safe recovery action first, then record the prevention work that reduces repeat incidents.

Questions worth viewing together
Should I translate commands, logs, or product names?

No. Keep commands, logs, file names, APIs, and product names unchanged, then explain the reasoning in the selected UI language.

What should the answer focus on?

State the root cause, the evidence that supports it, and the safest recovery direction.

Why can the scenario remain in the original language?

The source scenario is treated as an incident artifact. Guidance, checklist, hints, and explanations can be localized around it.