Cisco OSPF LSA 类型详解指南

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OSPF LSA Types: The Ultimate Guide

OSPF LSA Types – OSPF LSA 类型 –

OSPF uses LSAs or Link state Advertisements to share information of each network and populate the LSDB (Link State Database). The LSAs are used by routers to exchange topology information. An LSA contains routing and topology information that describe a part of an OSPF network. Routers exchange LSAs and learn the complete topology of the network until all routers have the exact same topology database. Infact, OSPF sends updates (LSAs) when there is a change to one of its links. LSAs are additionally refreshed every 30 minutes.
OSPF 使用 LSA 或链路状态通告来共享每个网络的信息并填充 LSDB（链路状态数据库）。路由器使用 LSA 来交换拓扑信息。LSA 包含描述 OSPF 网络一部分的路由和拓扑信息。路由器交换 LSA 并了解网络的完整拓扑，直到所有路由器都具有完全相同的拓扑数据库。事实上，当其中一个链接发生更改时，OSPF 会发送更新（LSA）。LSA 每 30 分钟额外刷新一次。

All OSPF LSA Types are mentioned in below table –

下表提到了所有 OSPF LSA 类型 –

Types	Description
LSA Type 1	Router LSA
LSA Type 2	Network LSA
LSA Type 3 or 4	Summary LSA & ASBR LSA
LSA Type 5	Autonomous System External LSA
LSA Type 6	Multicast OSPF LSA
LSA Type 7	Defined for Not-So-Stubby-Areas
LSA Type 8	External Attribute LSA for BGP
LSA Type 9,10,11	Opaque LSA