By default, every OSPF area starts as a "Normal" area. Inside a Normal area, every type of LSA / Route is allowed. But OSPF also has the ability to designate areas as Stub, or Not-So-Stubby-Areas (NSSA) which allows an OSPF engineer to optimize the types of Routes and LSAs which exist inside an Area.

In this video, we explore the five OSPF area types (Stub, Totally Stubby, NSSA, Totally NSSA). We also introduce the concept of a Type 7 LSA, and how they are used within Not So Stubby Areas and translated by ABRs which border an NSSA.

This is lesson 14 of the Practical OSPF series. The full series is available here:
   • Practical OSPF  

00:00 - Intro
00:24 - Pre-Requisites: Understanding OSPF LSAs
00:56 - Topology Introduction & LSA Illustration
02:56 - Normal Areas
03:38 - Stub Area (Stubby Area)
06:08 - Totally Stub Area (Totally Stubby Area)
08:08 - NSSA - Not So Stubby Area
09:49 - Type 7 LSA instead of TYpe 5 LSA in NSSA
11:10 - Type 7 LSAs are translated into Type 5 LSAs
12:08 - The problem with NSSA Areas
13:38 - Yes, I just said Not So Stubby Area Areas
13:55 - Totally NSSA / Totally Not So Stubby Area
15:45 - 5 OSPF Area Types or 3
19:21 - Summary / Outro / Next Lesson

=== PRE-REQUISITES ===

LSAs and LSDBs:
   • OSPF LSA - the BEST explanation of th...  

Designated Routers and Backup Designated Routers (DR / BDR):
   • Designated Router // Backup Designate...  

OSPF Hello Packets:
   • OSPF Hello Packets :: Area Types (Stu...  


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🎯 Full Practical OSPF Series ➡️ pracnet.net/ospf:
   • Practical OSPF