← 문제 라이브러리
Network Intermediate NETWORK-051 · 20 min

OSPF passive-interface default suppresses the new transit VLAN neighbor

무료
시나리오

The router has the right addressing and can ping the far side, but adjacency never forms because the new transit interface still inherits passive mode.

먼저 볼 것
  • Identify the primary failure signal in the Routing Policy Scope scenario.
  • Separate visible symptoms from the underlying technical dependency.
  • Describe the safest recovery path and the follow-up prevention work.
점검 체크리스트
  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.
복구와 재발 방지

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

같이 보면 좋은 질문
Why does passive-interface default create subtle outages?

It keeps routing configuration looking mostly correct while silently suppressing neighbor formation on just the new transit path.