What is OSPF and How Does It Work?

Рет қаралды 91,947

3 жыл бұрын

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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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Пікірлер: 51

@prafullpandit531 Жыл бұрын

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.

@sabhareeshwaran1498 3 жыл бұрын

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

@matthewdo9027 3 жыл бұрын

strongly agree. I like his details.

@arsenmkrtchyan4832 3 жыл бұрын

Best as always. Great job Keith and thank you !

@satyamdubey8836 3 жыл бұрын

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

@owzy55 3 жыл бұрын

This channel deserves more subs! Thanks, Keith!

@nickwhite3705 2 жыл бұрын

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

@babar9302 2 жыл бұрын

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.

@pleego20 Жыл бұрын

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.

@yumsai1979 9 ай бұрын

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

@ChrisB-fj7jk 2 жыл бұрын

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

@MrAmirkhan1983 3 күн бұрын

wonderful to listen and revise concepts, thanks

@m0dezer0 8 ай бұрын

Thanks for this! Great explanation on how OSPF works.

@tasha9650 2 жыл бұрын

Very helpful. Thanks for the refresh

@coxixx 4 ай бұрын

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

@andrepotts3898 3 жыл бұрын

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 3 жыл бұрын

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

@AdrianCsaszar 3 жыл бұрын

Love it, thank you

@Vikbytes 2 жыл бұрын

A very informative one indeed

@mohamedattouchi4834 3 жыл бұрын

I love this free content :p

@jossell911 Жыл бұрын

Great explanation💯

@naesone2653 8 ай бұрын

what a great and passionate explenation

@lxy2670 9 ай бұрын

i love your enthusiam!!

@jeffwise4465 2 жыл бұрын

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

@beckhamwilson2112 Ай бұрын

Legend. Very helpful

@PelczarTomasz 5 ай бұрын

Very, very good idea...

@lifeisbeautifu1 Жыл бұрын

Thank you

@md.zahidhassan3208 Жыл бұрын

thank you

@icysaracen3054 Жыл бұрын

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

@pathlabdotline3368 3 жыл бұрын

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

@cbtnuggets 3 жыл бұрын

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

@Jeancomputech Жыл бұрын

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

@f_hd4639 3 жыл бұрын

Keith is just best

@placidemutuyimana3160 Жыл бұрын

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

@samtheking25 3 жыл бұрын

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

@At0micMeltd0wn 3 жыл бұрын

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 3 жыл бұрын

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.