OSPF Hello Packets :: Area Types (Stub/NSSA) :: BDR/DR :: Practical OSPF

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In this lesson we take a look at Hello Packets and explore all the items they contain. Understanding the content of a Hello packet will show us the requirements for OSPF Routers to become Neighbors with each other.

The Hello packet also includes Area Type and BDR/DR/Priority, which allows us to explain the ideas of Stub areas and Not So Stubby Areas (NSSA). As well as the concepts of the Designated Router (DR), Backup Designated Router (BDR), and the Priority Number.

Here are all the contents of a Hello packet that are explained: Router ID, Area ID, Authentication Data, Network Mask, Hello Interval, Dead Interval, Area Type, Priority Number, Designated Router, Backup Designated Router, and Active Neighbors fields.

This is Lesson 3 of the Practical OSPF series:

00:00 - Start
00:12 - Hello Packet Introduction
01:43 - Router ID
02:36 - Hello Interval / Dead Interval
03:39 - Neighbors Field
05:03 - Area ID
05:18 - Authentication Data
05:51 - Network Mask
06:03 - Area Type / DR / BDR Introduction
06:19 - Normal Area, Stub Area, Not So Stubby Area (NSSA)
11:20 - Designated Router, Backup Designated Router, Priority
14:13 - When does DR/BDR election take place? Multi Access Links
15:35 - What fields must Match in Hello Packets?
17:47 - Outro

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PracticalNetworking

Never heard of any thing so clear, simple and valuable than this. Thanks

ahmed.benaros

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Even things I thought of early in the lecture were exceptionally clarified downstream in the lecture.

CyclingAndRunning

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azadkumar

You have an amazing teaching ability. Content is so well-organized, clear and concise! Thank you!

erikasantos

Best OSPF area type explanation I ever read, especially for stub and NSSA. Thanks a lot for helping to understand the concept within 5 minutes!

randyyihsienhan

I am finally be able to make a clear distinction between Stub and NSSA. Thank you very much

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papie

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DIY-ctsi

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stepankarel