What is OSPF and How Does It Work?

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In this video, Keith Barker covers OSPF, the protocol that makes it possible for your routers to forward traffic all the way through your network. There are a lot of different topics to deal with when you break down OSPF, but Keith covers them with easy examples and simple demonstrations:
Start off with a sample network topology to visualize how OSPF works on it
Breaking down how LSAs make OSPF possible
How Link State Databases provide routers with all the network information they need
OSPF Hello messages and how they help routers share data
Visualizing the sort of network that OSPF would be useful for can help understand exactly how it does that. Keith starts with a sample network topology and splits it into areas. Different routers provide access to different areas, and eventually they'll become OSPF neighbors.
But before you get to that, it's important to understand Link State Advertisements (LSA). When you have a network topology with multiple zones, the connecting routers are responsible for creating an LSA and broadcasting them. LSAs contain all the information about the networks that each router services.
With OSPF, it's possible for routers to "meet" one another, send "hello"s to one another and share their link state information. Link State Databases are shared between OSPF routers, and in turn those routers leverage the data inside those databases to make decisions about routing data across the entire network.
OSPF is the language that makes it possible for all the routers across a network to collaborate like this. It also makes it possible to carve the network up into smaller chunks so that you don't have to create routing tables for every last destination in the network on every single router.
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[@prafullpandit531]

I always sensed his passion for networking concepts when listening to the audios and now watching him explain these concepts, in the way he does it, confirms my belief. Hands down the best Trainer/Instructor/Mentor when it comes to Networking.

[@CANC127]

One of the best teacher in CBT nuggets is you sir...👍

[@matthewdo9027]

strongly agree. I like his details.

[@babar9302]

Today, first time I have cleared the concept of LSA and ABR how it should work in the OSPF routing protocol. Neighbors are the routers in each area... I have cleared concept eventually. Thanks so much.

[@thobekilendlovu5965]

Man you are just a life saver. You have made the topic so easy after your genious explanation. Thank you and keep up the good work

[@satyamdubey8836]

OG of IT for a reason! Thanks Keith for the nugget.

[@nickwhite3705]

The cup analogy is very helpful in explaining LSAs and Database per routing and how they are shared well done.

[@jimboelterdotcomm9153]

The cups and cards representation was an excellent visual aid.

[@yumsai1979]

That is the best explanation of OSPF I have ever seen... You are a master of your craft.....

[@coxixx]

Hi Boss, you are the best teacher of networking in the world.

[@arsenmkrtchyan4832]

Best as always. Great job Keith and thank you !

[@pleego20]

Your videos are amazing. Thank you so much for sharing your insane depth of knowledge, in such a fun and simple way! I understood instantly concepts that I thought were really hard.

[@m0dezer0]

Thanks for this! Great explanation on how OSPF works.

[@MrAmirkhan1983]

wonderful to listen and revise concepts, thanks

[@owzy55]

This channel deserves more subs! Thanks, Keith!

[@tasha9650]

Very helpful. Thanks for the refresh

[@andrepotts3898]

WOW this is my first time viewing your videos and I must compliment you, the friendly and helpfull person you are has helped me understand the meaning of OSPF, i wil subscride and share your link.

[@cbtnuggets]

Glad we could help, Andre! Thank you for learning with us.

[@ChrisB-fj7jk]

You are the hero I needed man! Thanks for this.

[@jeffwise4465]

man id love to have a beer or 6 with you!!! Thanks you are making this easy and fun!!

[@naesone2653]

what a great and passionate explenation

[@mohamedattouchi4834]

I love this free content :p

[@pathlabdotline3368]

Thanks Keith for the nugget. Could you please make a nugget on PPP and HDLC WAN protocols ?

[@cbtnuggets]

We'll pass your request onto Keith! If you’re looking for some more info on WAN, we recommend checking out this skill: www.cbtnuggets.com/learn/it-training/wan-technologies

[@lxy2670]

i love your enthusiam!!

[@beckhamwilson2112]

Legend. Very helpful

[@icysaracen3054]

Struggled with OSPF in my network course - Wish my teacher used props to make it so easy to understand.

[@placidemutuyimana3160]

is this Jeremy I always followed back in 2010's !!!

[@jossell911]

Great explanation💯

[@At0micMeltd0wn]

So the reason OSPF is so fast at convergance is because it has all the routes cached? And RIP is slower because it does things on the fly?

[@KeithBarker]

Hello Paypre! Thanks for the question. OSPF is faster, as it has direct knowledge (from all the LSAs) for every network in the area. If there is a change or if an existing router goes down, the neighbors will know about that right away, and inform the rest of the routers in the area. With a distance vector routing protocol like RIP, that does not have formal neighborships, if a RIP router fails or goes away, it will be quite a while (after a timeout) before the rest of the network will remove those routes that are no longer available. Hope that helps, and happy studies.

[@AdrianCsaszar]

Love it, thank you

[@Jeancomputech]

Great video i do have a question between area 0 and area 1 is that a BGP protocol between them?

[@Vikbytes]

A very informative one indeed

[@lifeisbeautifu1]

Thank you

[@samtheking25]

yes big boy Keith how's it hanging my G!

[@f_hd4639]

Keith is just best

[@jamalyarfoor5798]

What if R8 wanted to send something to R1?

[@elalamihd9712]

top

[@majdshook3150]

Spent 12mins staring at the guy on your left 🤣

[@XJacksonvilleX]

3:46 bet you'd get way fucking more making horror movies...

[@Research_This62]

This guy gives a mad scientist vibes. He needs an acting role.

[@milesdyson5211]

I don't get it ?

[@edwardstewart4430]

I can tell you know what your talking about, but if someone is trying to follow, it would be helpful to slow down a bit.

[@rdh9475]

Im lost

[@米贵]

中国的老师学学，人家形象生动多了，别老是讲PPT了😅

[@marksummers463]

Way too complicated.

[@jess0382]

My Channel Nickname: OSPFG What You Used: OSPF (No G)

[@tahersadeghi6773]

Cheif. You speak too fast. Chew many of your words and this makes it hard to follow you. Just go head and watch one of your videos.

[@md.zahidhassan3208]

thank you