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

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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:
• Networking Fundamentals
👉 Routers and how they work:
Everything Routers do:
• Everything Routers do ...
How Routers forward packets:
• Everything Routers do ...
Router Hierarchies & Route Summarization:
• Router Hierarchies and...
👉 Distance Vector vs Link State // IGP vs EGP
• EGP / IGP :: Distance ...
👉 Route Precedence and Router Path Selection
• Route Precedence -- Ho...
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:
pracnet.net/discord
📜 More free CCNA resources:
www.practicalnetworking.net/i...
#ospf #lsdb #lsa

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16 июн 2024

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Комментарии : 190

@PracticalNetworking 2 года назад

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

@catalyticcentaur5835 2 года назад

Yup, I think so. Makes it less abstract or more graspable. Although, I've forgotten if you brought this in your live cast. Did ya? I could check it, because usually, I download stuff from YT that interests me. Just refer to the first two sentences of this paragraph/comment.

@fatikawtar9316 2 года назад

Thanks for the video i think it's good to commands results

@PracticalNetworking 2 года назад

@@catalyticcentaur5835 Nope, that part was new since the live cast. But glad you think it's helpful. I think it is too.

@PracticalNetworking 2 года назад

@@fatikawtar9316 Great, glad to hear it =)

@malexherron 2 года назад

best networking channel on youtube hands down

@PracticalNetworking 2 года назад

@qaiserwaseem5431 5 месяцев назад

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. 👏

@karenward2655 Год назад

I am studying to take the CCNA exam and have searched RU-vid 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. 👍

@PracticalNetworking Год назад

@tpawaits550 2 года назад

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

@PracticalNetworking 2 года назад

More on the way =). Your "Awaiting" will be rewarded! ;)

@leroiobi5928 Год назад

@@PracticalNetworking Can't wait for your EIGRP and BGP series. Your beautiful mind will make them easier to grasp.

@surenderaireddy7541 2 года назад

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

@PracticalNetworking 2 года назад

Thank you, Surender =). Cheers !

@matthewcardinal4186 Год назад

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

@ramyagandhi-vc4cp 11 месяцев назад

Super clear, concise, and very easy to understand. Great Job.

@inderdeepsingh4076 2 года назад

Thank you for creating an OSPF series. Awesome!!

@PracticalNetworking 2 года назад

You're welcome, Inderdeep. Glad you've enjoyed it =)

@stephenl5121 Год назад

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

@adedejiemmanuel1 2 года назад

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.

@PracticalNetworking 2 года назад

Whoa, thank you so much for the kind words. I'm truly grateful you appreciate the content and have learned from my videos. I, too, wish that more people could get this type of help/training when they are trying to learn Networking. I sure wish I did as well when I was first learning!

@techwithmuchiri5921 2 года назад

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.

@PracticalNetworking 2 года назад

Glad you're enjoying this, Tony. Do check the full series: ru-vid.com/group/PLIFyRwBY_4bSkwy0-im5ERL-_CeBxEdx3 Noted about other routing protocols. If you're interested, I covered EIGRP on my blog: www.practicalnetworking.net/stand-alone/eigrp-terminology/ www.practicalnetworking.net/stand-alone/eigrp-metric/ www.practicalnetworking.net/stand-alone/eigrp-feasibility-condition/

@eh597 Год назад

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.

@wwolfram33 2 года назад

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!

@PracticalNetworking 2 года назад

Excellent. I think I liked the effect of them as well. I'm planning to include them more often in the rest of the series as well. Cheers, Ward!

@priyasingh-qj4ng 2 года назад

Thanks for starting OSPF series , As always your teaching style is awesome...

@PracticalNetworking 2 года назад

Glad you enjoyed it, Prashant. You're welcome!

@Rigel_Kuriom_Mandara 2 месяца назад

An exceptional presenter and educator. Thanks!

@4skinntim420 2 месяца назад

This content is pure gold!

@iamjoycheee 3 месяца назад

magnificent!!! thank you sir! I'm commenting before the video ends cause this deserves the right to be on the algorithm .

@stops_n_snaps Год назад

Thank you for your wonderful teaching, ospf concepts are very clear from this video

@PracticalNetworking Год назад

You're very welcome, Pramodh. Glad you enjoyed it.

@MikeyMyco Год назад

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.

@PracticalNetworking Год назад

You're very welcome, Pedro! Glad you enjoyed them!

@marks5850 2 года назад

Awesome. Straight to the point. My style of learning!!!! Thank you!

@PracticalNetworking 2 года назад

You're welcome =).

@olegasgolubevas8773 Месяц назад

Thank You for making such a high quality material!

@adrianmuscat452 9 месяцев назад

Great video, really helped me to understand the different terms for packets and tables and how they relate

@ankur9829 Год назад

fabulous fantastic Trainer with perfect explanation mode.

@PracticalNetworking Год назад

Thanks, Ankur ;)

@crixisaow-odi7139 8 месяцев назад

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.

@PracticalNetworking 8 месяцев назад

You're very welcome. I'm happy that you're enjoying this series =)

@gatty. 2 года назад

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

@PracticalNetworking 2 года назад

Thank you, Gatty. I appreciate the kind words. And the help w/ the algorithm =). Cheers!

@bhagyashreeaher7429 5 месяцев назад

Thank you for this great series !!!! Happy learning

@vladislavkaras491 10 месяцев назад

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

@nateruttinger8145 Год назад

Commenting for the algorithm, and giving obligatory thanks! awesome, digestible content.

@PracticalNetworking Год назад

Thank you for the support, and you're very welcome. Glad you enjoyed the content =). Hope you enjoy the rest of the OSPF series as well!

@sergioalcantar3290 7 месяцев назад

As always expertly done.

@sabtenamsite6865 Год назад

thank you soooo much. it is most understandable explanation about OSPF I ever seen

@PracticalNetworking Год назад

Glad you enjoyed it, Sabtenam. Hope you enjoy the whole series: pracnet.net/ospf Could you do me a favor? Do you mind sharing this video on Linked In, Reddit, Twitter, Facebook, or any other social media you use? As an independent creator, that would be an _enormous_ help, and I would appreciate it _greatly_ .

@bangvu2245 3 месяца назад

Well said and explained. Many thanks

@Quick_UnBoxing0 Год назад

Amazing explanation sir...waiting for your ccna video meanwhile learning OSPF. Thank you for step-by-step explanation with examples and summary that helps a lot.

@PracticalNetworking Год назад

Glad you enjoyed these Jojo. Cheers !

@antifics 2 года назад

Thanks! High Quality content. Greetings From Chile!

@PracticalNetworking 2 года назад

You're welcome. Greetings from Seattle =)

@kisali777 2 года назад

Your explanation are simple and clear

@PracticalNetworking 2 года назад

Thank you, Kisali!

@devinmayhew1 2 года назад

Fantastic content, can't thank you enough for this!

@PracticalNetworking 2 года назад

You're very welcome, Devin. Don't forget to check out the whole series: ru-vid.com/group/PLIFyRwBY_4bSkwy0-im5ERL-_CeBxEdx3

@kwiatriot6190 2 года назад

Great content! Thanks for all that you do.

@PracticalNetworking 2 года назад

You're welcome, Kwiat =)

@vszabad Год назад

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

@PracticalNetworking Год назад

Good luck w/ the interviews! Happy to hear this series is helping!

@nicksonkosi Год назад

How did the interview go?

@Don-Carillo 2 года назад

Cheers ,Ed. Great start to no doubt another great mini course from you. Looking forward to the stubby, not so stubby and totally not so stubby area explanations. Really struggling to get my head round them 😫.

@PracticalNetworking 2 года назад

Oh yes! That's going to be great fun. =) Cheers, Don!

@user-oe7sj9we7z Год назад

Excellent video, as all the rest on this channel

@thomaspaterik3506 Год назад

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

@PracticalNetworking Год назад

Thanks for the kind words, Thomas. Hope you enjoy the rest of the OSPF video as well. Noted about the pace. Does RU-vids playback speed controls help? You can slow me down to .5 or even 0.25 speed if you need.

@Therojasvictor 9 месяцев назад

Excellent teaching.

@Sraj659 Год назад

Very interesting and fruitful contents that you ed are making.... Thanks a lot..

@tiagonovembre5465 2 года назад

Very helpful material. thanks for sharing it.

@PracticalNetworking 2 года назад

You're welcome. =)

@afshin9 Год назад

I love the way you teach, keep it up buddy

@PracticalNetworking Год назад

Cheers Afshin =)

@afshin9 Год назад

@@PracticalNetworking 🙏

@DeepakKumar-ov8ko 2 года назад

Very nicely explained ..you are fabulous 🙏

@PracticalNetworking 2 года назад

Thanks, Deepak!

@user-dr6ms1ny9r Месяц назад

Keep up the good work! Great Video!

@ciscobatais2 10 месяцев назад

excellent explanation 👍👍

@syedshah9836 Год назад

Excellent work

@kwest30038 Год назад

07Sept2022 >> Thank you for explaining OSPF. I'm studying for my CCNA. thank you again....

@PracticalNetworking Год назад

Good luck w/ your CCNA. Glad you enjoyed these !

@BekoIQ Год назад

No one like You in all RU-vid , you are the best always

@PracticalNetworking Год назад

@arshdeep1286 Год назад

Lot of blessings sir

@herteert299 Год назад

The best teacher ever.

@PracticalNetworking Год назад

@mcsleverrrflowers4849 2 года назад

You're the definition of the G.O.A.T.

@PracticalNetworking 2 года назад

@shahadatanwar4109 Год назад

Awesome explanations

@PracticalNetworking Год назад

Thank you =)

@flyboyrj360501 10 месяцев назад

Nice session !!!

@PracticalNetworking 9 месяцев назад

Glad you enjoyed it, Flyboy =).

@NaniRaja1986 2 года назад

Super sir.. explanation was too good 👍

@PracticalNetworking 2 года назад

_too_ good! ;) I'm hoping they continue to get better!

@JKRowl 10 месяцев назад

God bless you man! I THINK I'm about to break my curse for years, AKA the OSPF!

@PracticalNetworking 9 месяцев назад

Wohoo! Hope this helps get you through to "getting it" with OSPF. CHeers !

@JKRowl 9 месяцев назад

@@PracticalNetworking Thank you so much sir, I really appreciate. Im struggling with the OSPF mode types and the SEQUENCE of operation (what happens first - hello packets or down state or multicatsing) hence Im trying to figure it out. But making progress daily thanks to you :)

@PracticalNetworking 9 месяцев назад

The neighbor adjacency video will help, I think it's #4 in the series: pracnet.net/ospf

@wwolfram33 5 месяцев назад

Fantastic!

@billmichae Год назад

Superb presentation

@PracticalNetworking Год назад

Thank you, Bill. =)

@ronigrish6219 Год назад

amazing explaination

@Ramel34 Год назад

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.

@PracticalNetworking Год назад

Thank you for the kind words =). I've considered it many times ^_^

@jonov2550 Год назад

Indeed! I'm not yet done with CCNA Certification. But this explanation was so absolutely on point and clear to understand. Please consider something like a CCNP course on YT or Udemy? I'd surely pay for that. Top content!!

@PracticalNetworking Год назад

@@jonov2550 Thanks for the kind note, Jo. CCNA/CCNP is a project I think about _constantly_ . Who knows what's in store for the future =)

@shujauttali2608 Год назад

We will wait for your ccie series. 😊

@alexandrkovalsky1711 Год назад

great video!

@subee128 3 месяца назад

Thank you very much 🙏🏻

@milandinda9966 6 дней назад

Best Teacher 🙂

@rohanofelvenpower5566 Год назад

this series is very educational and sexum

@jairunet 2 года назад

@Practical Networking, wow simply explained, very easy to understand for those with any fuggy understanding like me, excellent fundamentals, thank you so much! and I looking forward to the next video areas and router types!

@PracticalNetworking 2 года назад

Glad you enjoyed it, Jair! Next video releasing Monday morning =)

@syedamehak7277 Год назад

Amazing 🔥

@browneyedbabes7863 Год назад

👏🎬 Thank you so much!!

@PracticalNetworking Год назад

@sudhakardornadula2507 6 месяцев назад

Thanks for Sharing the Knowledge. wishing u happy new year Advance...

@SOGUIREL 5 месяцев назад

Very good content

@ershadramezani6716 4 месяца назад

it was perfect. thanks !

@PracticalNetworking 3 месяца назад

You're very welcome, thank you for supporting the channel.

@VibhavShinde 4 месяца назад

THis is so amazing.. commenting for better reach

@PracticalNetworking 3 месяца назад

Thank you for your support =)

@ElnurHuseynov-zo2ee Год назад

Thank you so much.

@muhammadsalmanshaikh3359 2 года назад

Great lecture!!! Please make videos on advanced topics like ISIS and BGP from beginning

@PracticalNetworking 2 года назад

Noted about BGP. THat comes up a lot =)

@charlesikpeme7777 2 года назад

Awesome!

@PracticalNetworking 2 года назад

@meunomeeBJJ Год назад

Thank you.

@kebekitechnology1223 2 месяца назад

Nice teacher

@khelouiazzeddine3113 2 года назад

Thanks very interesting

@PracticalNetworking 2 года назад

You're welcome, kheloui . =)

@luchiripaul917 Год назад

Thanks a lot.

@PracticalNetworking Год назад

You're very welcome =)

@eitanfeigenbaum763 8 месяцев назад

GREAT!!

@PracticalNetworking 8 месяцев назад

Glad you enjoyed it, thank you for being a channel member =)

@MB_72282 Год назад

Awesome.

@PracticalNetworking Год назад

Cheers, Mahdi. Thank you =)

@r.f9823 8 месяцев назад

Very good

@dnj20 Год назад

great video

@PracticalNetworking Год назад

Thank you, DNJ. Hope you enjoy the rest of the OSPF series as well: pracnet.net/ospf

@dnj20 Год назад

@@PracticalNetworking yeah. it really helped me understand OSPF. I shared it with my cisco course mates

@PracticalNetworking Год назад

@@dnj20 Thank you for your support =)

@rickwiers1905 Год назад

Nice content....

@georgeavong4937 Год назад

thank you

@davidjimenez2992 Год назад

great !!

@PracticalNetworking Год назад

👍

@mohanraj4405 2 года назад

Very nice video🇮🇳

@PracticalNetworking 2 года назад

Thank you, mohan raj.

@user-wx7ny3pw8t 6 месяцев назад

nice thank you

@vskreddy2416 Год назад

Awesome

@ovis Год назад

thanks

@doaaomar133 Год назад

Thank u

@PracticalNetworking Год назад

You're welcome !

@afshin9 Год назад

Thanks

@PracticalNetworking Год назад

Thank you for supporting this channel, Afshin. Glad you enjoyed this video / content.

@afshin9 Год назад

@@PracticalNetworking 🙏

@waverache8296 2 года назад

Good

@mudtruka9196 Год назад

Ed, thank you for a great series. Question, is a "summary of LSA's" an actual list of summary routes?

@PracticalNetworking Год назад

You're welcome. Yes, more or less it's simply a list of all LSAs a router has (not just summary routes or summary LSAs). In Lesson 6 I give you a PCAP file, you can take a look at some DBDs to see exactly how the LSA summary in the DBD is different from the actual LSA sent in the LSU.

@nikhilkarale8588 Год назад

Hello sir It will be a huge favor of you make such videos on bgp & Mpls too !

@PracticalNetworking Год назад

Hi Nikhil, noted =).

@nikhilkarale8588 Год назад

@@PracticalNetworking huge respect ♥️

@rabbitsswag5029 Год назад

Thanks for this informative video. Can two routers in diffferent OSPF areas can communicate if they are not connected to AREA 0? Also why all routers need to communicate to area 0?

@PracticalNetworking Год назад

Great question =). It's answered in the lesson on Areas: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-CM9BlFHB3q4.html