OSPF makes use of three tables: Neighbor Table, Topology Table, and a Routing Table. The Topology table in OSPF is referred to as the Link State Database (LSDB). Each entry within the topology table is referred to as a Link State Advertisement (LSA). In this video we'll unpack each of these terms.

Then we'll take a look at the types of OSPF Packets: Hello Packets, DBDs, LSRs, LSUs, and LSAcks (Database Descriptors, Link State Requests, Link State Updates, and Link State Acknowledgements). These five packets are involved in every OSPF conversation.

To get the most out of this series, you should watch these pre-requisites:

👉 Networking Fundamentals series:
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👉 Routers and how they work:

Everything Routers do:
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How Routers forward packets:
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Router Hierarchies & Route Summarization:
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👉 Distance Vector vs Link State // IGP vs EGP
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👉 Route Precedence and Router Path Selection
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0:00 - Lesson 1 Intro
1:01 - OSPF Neighbor Table
2:59 - OSPF Topology Table, LSDB, and LSAs
5:40 - Routing Table
7:01 - OSPF Packets
7:17 - OSPF Hello Packets
8:17 - OSPF Database Descriptor Packets (DBDs)
9:34 - Link State Requests, Link State Updates, Link State ACKnowledgements (LSRs, LSUs, LSAcks)
10:16 - OSPF Built-in Reliability
10:44 - Sharing LSAs with OSPF Neighbors
11:33 - Outro


💬 Join us on Discord:
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📜 More free CCNA resources:
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#ospf #lsdb #lsa

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