Link-State Advertisement (LSA)

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Link-State Advertisement (LSA) – A message an OSPF router floods to describe its local links and routes, letting every router build an identical topology database and compute routes; types include router (Type 1), summary (Type 3), external (Type 5), and NSSA external (Type 7). See: Dealing with Backdoor Links on VOS Devices, Using OSPF for Dual Site HA