← Problem Library
Network L3 NETWORK-288 · 17 min

A campus access stack advertises the voice VLAN while the downstream trunk template still prunes it on the uplink during a failover rehearsal

Phones discover the right segment and the wired path never carries it end to end. Normal traffic masked the issue until the standby or alternate path became active under rehearsal conditions.

NetworkFoundation OpsLevel 3Free17 min
Scenario

Phones discover the right segment and the wired path never carries it end to end. Normal traffic masked the issue until the standby or alternate path became active under rehearsal conditions.

What to check first
  • Identify the primary failure signal in the Voice Discovery Correct, Uplink Path Missing 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.