OSPF Framework & OSPF Packets: LSDB, LSA, Hello, DBD, LSR, LSU, LSAck
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- Опубліковано 3 сер 2024
- 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 - Наука та технологія
📌 *More free preview lessons from the Practical OSPF course:* pracnet.net/ospf
📌 *Want even more? Check out the full course:* pracnet.net/ospfcourse
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.
Thanks for the video i think it's good to commands results
@@catalyticcentaur5835 Nope, that part was new since the live cast. But glad you think it's helpful. I think it is too.
@@fatikawtar9316 Great, glad to hear it =)
I am studying to take the CCNA exam and have searched UA-cam 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. 👍
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. 👏
OSPF concepts explained very simple and straight forward up to the point. Thank you , Eddie Harmoush.
Thank you, Surender =). Cheers !
A concise explanation of OSPF. We NEED MORE of this in various topics PLEASE 🙏
More on the way =). Your "Awaiting" will be rewarded! ;)
@@PracticalNetworking Can't wait for your EIGRP and BGP series. Your beautiful mind will make them easier to grasp.
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.
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!
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.
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.
You're very welcome. I'm happy that you're enjoying this series =)
Super clear, concise, and very easy to understand. Great Job.
Thank You for making such a high quality material!
You're very welcome, thank you for supporting the channel.
best networking channel on youtube hands down
Thank you for your wonderful teaching, ospf concepts are very clear from this video
You're very welcome, Pramodh. Glad you enjoyed it.
I really appreciate your lessons. Very clear, concise, and easy to understand. Please keep up the amazing work.
Very great explanation! Much better than provided by Cisco themselves!
Thanks for the video!
I have watched all these OSPF videos. They are brilliant, so clear and easy to understand. Thank you very much
I have read and viewed numerous OSPF presentations. This was the very best. Clear and concise. Only suggestion is to slow down a little.
Thanks for the kind words, Thomas. Hope you enjoy the rest of the OSPF video as well. Noted about the pace. Does UA-cams playback speed controls help? You can slow me down to .5 or even 0.25 speed if you need.
An exceptional presenter and educator. Thanks!
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.
You're very welcome, Pedro! Glad you enjoyed them!
07Sept2022 >> Thank you for explaining OSPF. I'm studying for my CCNA. thank you again....
Good luck w/ your CCNA. Glad you enjoyed these !
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!
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!
Thanks for starting OSPF series , As always your teaching style is awesome...
Glad you enjoyed it, Prashant. You're welcome!
Thank you for creating an OSPF series. Awesome!!
You're welcome, Inderdeep. Glad you've enjoyed it =)
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.
Glad you're enjoying this, Tony. Do check the full series: ua-cam.com/play/PLIFyRwBY_4bSkwy0-im5ERL-_CeBxEdx3.html
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/
You're the first guy I've heard say why to actually like, comment and subscribe.
Fantastic video! I really like your teachings :D
Thank you, Gatty. I appreciate the kind words. And the help w/ the algorithm =). Cheers!
thank you soooo much. it is most understandable explanation about OSPF I ever seen
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_ .
Commenting for the algorithm, and giving obligatory thanks! awesome, digestible content.
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!
Great video, really helped me to understand the different terms for packets and tables and how they relate
Thank you for this great series !!!! Happy learning
magnificent!!! thank you sir! I'm commenting before the video ends cause this deserves the right to be on the algorithm .
Well said and explained. Many thanks
As always expertly done.
fabulous fantastic Trainer with perfect explanation mode.
Thanks, Ankur ;)
Awesome. Straight to the point. My style of learning!!!! Thank you!
You're welcome =).
This content is pure gold!
I love the way you teach, keep it up buddy
Cheers Afshin =)
@@PracticalNetworking 🙏
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.
Glad you enjoyed these Jojo. Cheers !
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 😫.
Oh yes! That's going to be great fun. =) Cheers, Don!
Currently preparing for a technical interview that will include OSPF and BGP. This is very handy for me, thank you so much!
Good luck w/ the interviews! Happy to hear this series is helping!
How did the interview go?
Excellent teaching.
No one like You in all UA-cam , you are the best always
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.
Thank you for the kind words =). I've considered it many times ^_^
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!!
@@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 =)
We will wait for your ccie series. 😊
Your explanation are simple and clear
Thank you, Kisali!
God bless you man! I THINK I'm about to break my curse for years, AKA the OSPF!
Wohoo! Hope this helps get you through to "getting it" with OSPF. CHeers !
@@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 :)
The neighbor adjacency video will help, I think it's #4 in the series: pracnet.net/ospf
Excellent video, as all the rest on this channel
Very interesting and fruitful contents that you ed are making.... Thanks a lot..
Very helpful material. thanks for sharing it.
You're welcome. =)
Great content! Thanks for all that you do.
You're welcome, Kwiat =)
excellent explanation 👍👍
Keep up the good work! Great Video!
This man is LEGEND🫡🫡🫡🫡
Fantastic content, can't thank you enough for this!
You're very welcome, Devin. Don't forget to check out the whole series: ua-cam.com/play/PLIFyRwBY_4bSkwy0-im5ERL-_CeBxEdx3.html
Nice session !!!
Glad you enjoyed it, Flyboy =).
Thanks! High Quality content. Greetings From Chile!
You're welcome. Greetings from Seattle =)
Excellent work
Very nicely explained ..you are fabulous 🙏
Thanks, Deepak!
Lot of blessings sir
The best teacher ever.
Awesome explanations
Thank you =)
amazing explaination
Best Teacher 🙂
You're the definition of the G.O.A.T.
Superb presentation
Thank you, Bill. =)
Super sir.. explanation was too good 👍
_too_ good! ;) I'm hoping they continue to get better!
Thanks for Sharing the Knowledge. wishing u happy new year Advance...
great video!
THis is so amazing.. commenting for better reach
Thank you for your support =)
Thank you very much 🙏🏻
Great lecture!!! Please make videos on advanced topics like ISIS and BGP from beginning
Noted about BGP. THat comes up a lot =)
this series is very educational and sexum
Fantastic!
Very good content
Thank you so much.
it was perfect. thanks !
You're very welcome, thank you for supporting the channel.
Nice teacher
Amazing 🔥
👏🎬 Thank you so much!!
Thank you.
Nice content....
Thanks very interesting
You're welcome, kheloui . =)
Thanks a lot.
You're very welcome =)
@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!
Glad you enjoyed it, Jair! Next video releasing Monday morning =)
Awesome!
Very good
Hello sir
It will be a huge favor of you make such videos on bgp & Mpls too !
Hi Nikhil, noted =).
@@PracticalNetworking huge respect ♥️
Very nice video🇮🇳
Thank you, mohan raj.
nice thank you
thank you
great video
Thank you, DNJ. Hope you enjoy the rest of the OSPF series as well: pracnet.net/ospf
@@PracticalNetworking yeah. it really helped me understand OSPF. I shared it with my cisco course mates
@@dnj20 Thank you for your support =)
Awesome.
Cheers, Mahdi. Thank you =)
GREAT!!
Glad you enjoyed it, thank you for being a channel member =)
great !!
👍
thanks
Awesome
Thank u
You're welcome !
Thanks
Thank you for supporting this channel, Afshin. Glad you enjoyed this video / content.
@@PracticalNetworking 🙏
Good
Ed, thank you for a great series. Question, is a "summary of LSA's" an actual list of summary routes?
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.
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?
Great question =). It's answered in the lesson on Areas: ua-cam.com/video/CM9BlFHB3q4/v-deo.html
Really Like The Explanation.. Sir Could You Make Playlist On Vpn also.
Noted about VPNs. Glad you enjoyed this video =)
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