Network Advanced NETWORK-089 · 18 min

OSPF adjacency forms but area type mismatch suppresses the LSAs needed by the branch route

Neighbor status looks correct, yet the expected route never appears because one side treats the area differently and filters critical LSA propagation.

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Neighbor status looks correct, yet the expected route never appears …

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1 · 원인 분석 2 · 복구 방안 3 · 재발 방지

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OSPF adjacency forms but area type mismatch suppresses the LSAs needed by the branch route

OSPF virtual link stays down

A transit interface was left out of passive-interface default exceptions, and a rogue OSPF adjacency forms during an access switch replacement

OSPF adjacency remains full but the summary route hides the more specific path needed for policy routing

A routing summary is correct in normal conditions, but when the only specific route fails the summary still attracts traffic into a black hole