OSPF Framework & OSPF Packets: LSDB, LSA, Hello, DBD, LSR, LSU, LSAck

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:

👉 Routers and how they work:

Everything Routers do:

How Routers forward packets:

Router Hierarchies & Route Summarization:

👉 Distance Vector vs Link State // IGP vs EGP

👉 Route Precedence and Router Path Selection

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:

📜 More free CCNA resources:

#ospf #lsdb #lsa

[PracticalNetworking]

📌 *More free preview lessons from the Practical OSPF course:* pracnet.net/ospf
📌 *Want even more? Check out the full course:* pracnet.net/ospfcourse

[karenward]

I am studying to take the CCNA exam and have searched YouTube as well as Google and have yet to come across anyone who explains the subject at hand in a way that is very easy to understand. For example, subnetting I watched tons of videos on subnetting and still was not able to grasp the concept until I watched Ed’s ” Subnetting Mastery” video, I finally understand how to subnet thanks to Ed’s teaching. 👍

[tpawaits]

A concise explanation of OSPF. We NEED MORE of this in various topics PLEASE 🙏

[qaiserwaseem]

It's hard to believe as a CCNA student, this video just covered all of the doubts and questions I had for this particular topic. Extremely well explained. 👏

[adedejiemmanuel]

Thanks.
The content is great; I'm learning everyday. Your presentation is sincere. Your production is of high quality; I marvel at the the effects from 'page to page'. I'm humbled that you do so much for free to free us from our limitations. You're my very best teacher.
Aside, I always feel that you should be known and celebrated as much as other players on social media. Sad that charlatans are praised more, 🙁😏. Honestly, you're a gold mine.
You're so sincere and passionate about this content. Thank you.

[surenderaireddy]

OSPF concepts explained very simple and straight forward up to the point. Thank you, Eddie Harmoush.

[eh]

I gotta say, you are amazing at teaching networking. I hope your channel continues to grow, so that you continue to push out educational content.

[thomaspaterik]

I have read and viewed numerous OSPF presentations. This was the very best. Clear and concise. Only suggestion is to slow down a little.

[wwolfram]

The show commands added much to my learning of this lesson. It helps me recall what the different show commands 'show'. It also reinforces the content that was presented and confirming/verifying it which will be helpful to me during troubleshooting. Thanks!

[crixisaow-odi]

Thank you very much for the clear and practical explanations of the material. I'm studying and working full time and your videos are very helpful, much appreciated.

[malexherron]

best networking channel on youtube hands down

[MikeyMyco]

Excellent content. I just came across your videos while studying for my CCNA and your explanations have shone light on some points where I had become stuck. Thank you sir.

[techwithmuchiri]

One of the best OSPF explanations, working towards getting my CCNA and this was really helpful.
Would love to see such videos for the other routing protocols too.
Great work, cheers.

[Ramel]

Can you do a full CCNP/CCIE series? It's hard to find someone that can break it down CLEARLY like you do. The animation is on point, you're not jumping all over the place, the video isn't 2 hours long, you're speaking English lol, and so on.

[stephenl]

I have watched all these OSPF videos. They are brilliant, so clear and easy to understand. Thank you very much

[vszabad]

Currently preparing for a technical interview that will include OSPF and BGP. This is very handy for me, thank you so much!

[gatty.]

You're the first guy I've heard say why to actually like, comment and subscribe.
Fantastic video! I really like your teachings :D

[matthewcardinal]

I really appreciate your lessons. Very clear, concise, and easy to understand. Please keep up the amazing work.

[vladislavkaras]

Very great explanation! Much better than provided by Cisco themselves!
Thanks for the video!

[olegasgolubevas]

Thank You for making such a high quality material!