OSPF Network Types - FINALLY, an explanation that makes sense - Practical OSPF
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- čas přidán 24. 07. 2024
- Every OSPF link is associated with an OSPF Network Type. There are 5 Network Types that exist: Point to Point, Broadcast, Non-Broadcast Multi-Access (NBMA), Point to Multipoint, and Point to Multipoint Non Broadcast (P2MP-NB).
Each Network Type acts slightly different in an effort to optimize OSPF's behavior. In this video, we look at the differences between all five OSPF network types.
This is lesson 13 of the Practical OSPF series. The full series is available here:
• Practical OSPF
00:00 - Intro
00:45 - Point to Point and Broadcast Network Types
02:22 - Point to MultiPoint (P2MP)
02:53 - Full Mesh Connectivity vs Hub and Spoke
03:43 - Single IP Subnet
04:27 - WAN vs LAN and Physical Connectivity
06:12 - NBMA and Point to MultiPoint Non Broadcast
07:08 - Differences between OSPF Network Types
08:40 - Designated Routers
10:38 - Default Hello Timers and Dead Intervals
11:22 - Automatic Neighbor Discovery
13:48 - Neighbor Adjacency Packet Destination
14:51 - LSA Update Destination IP Address
17:00 - Routing Tables and Next-Hop IP Addresses
20:23 - Summary and Differences Table
=== PRE-REQUISITES ===
LSAs and LSDBs:
• OSPF LSA - the BEST ex...
Designated Routers and Backup Designated Routers (DR / BDR):
• Designated Router // B...
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• Practical OSPF - Věda a technologie
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Busy studying for CCIE EI and I've not found anyone examplaining OSPF the way you do. You have a gift of explaining complex topics in a way that others can understand it.
Thanks and keep up the good work !
Thanks for the kind words =)
Your creativity reflects your experience. Information tables are a gem. Ed, Thank you.
There were so many little discrepancies I was just unsure of prior to watching your work just as you've described throughout series. Like the songs says " I can see clearly now that the rain has gone".... Thankyou so much Ed between this and Subnetting you are my hero!
Thanks for the kind words, Xunil. Much appreciated =). Glad you enjoy my content !
By far the best teacher I've seen online, you manage to summarise multiple modules into condensed videos that make so much more sense. Cisco really need to employ someone like you to create their content.
Glad you're enjoying this content, Matthew. I appreciate the kind words.
This is the best video on this topic. I’m amazed at how well you explain the concepts.
indeed mr Practical Network.. FINALLY! . love the content.
Finally indeed =). Cheers, glad you are enjoying this series.
Seriously, one of the best all time explanations I have come across. You need to continue making such videos.
This is the best and clearest explanations for OSPF series that I can find after a long search. This channel got some other great stuff as well. I joined a member already and didn't regret a bit. Thanks!!
Thanks for the kind words, Sam! So glad you are enjoying and appreciating this series =). Thank you for supporting the channel with a membership! Don't forget to join the Discord if you have any questions I'd be happy to help!
wow, it is simply put , my memorization of this topic just eventually vanished because there is no need cause you explained it veryvwell. Thank you sir!
Probably the best series I've found on OSPF, really well put together. Small correction: at 20:49 OSPF was created 1989. ;)
🤦♂ Woops! I wonder if I transposed the 9 and the 8 there... heh, oh well. Good correction. Glad you enjoyed the series =)
If you're willing... please help me spread the word about the series. I put a _ton_ of effort into all the lessons, and unfortunately the YT algorithm alone isn't really favoring the content =(.
First time in life learned ospf clearly.
Thanks,
Ed
You're very welcome, Arsh. =)
mate, this is one of the best lessons I have ever seen
Bro you are the best, Expecting BGP tutorial also from you.👌
Thanks !!! You videos are helping to understand the concept much faster!!!
Clear and Concise. Best Videos on Networking. Thank you
Thank you for the kind words. And for supporting the channel. =)
This was excellent. The framework you present is very helpful. 👍
Wow! OSPF network Types has finally arrived. Well done Ed. Complicated topic (OSPF Network Types) simply and clearly explained. Thanks.
Thank you, Sinade. Glad you enjoyed this one. It was great fun to put together =)
Please if possible a good eigrp & bgp series
I was trying to understand serial vs ethernet connections and why one is broadcast and one is point to point, not even ospf related, just in general, and this video helped immensely. excellent video, thank you.
That's an extra mile of OSPF knowledge! Thank you :)
You're welcome, Mr. D. =) Cheers.
You are a great teacher! Thank you
Fantastic explanation as always!
Outstanding! Superb! Bravo! Very clear and to the point.
You are the best teacher i have come across teaching the networking concepts
Easy to follow, thanks!
Thanks for sharing this Eddie
Beautiful ❤️❤️❤️ Lessons on OSPF
Very good explanation, thanks for it, concepts regarding network types is clear now.👍
Glad it all makes sense now, Girish. Cheers!
Other instructors try to make it as complicate as possible... To give a sense that they are dealing something very difficult subject. On contrary, you are trying to elucidate the toughest topic in simplest way and words... That even a lay man can understand. Kudos to your efforts. Commendable
Chatgpt could never give an explanation this thorough! thanks! 👌
Brilliant explanation. I'd been struggling with these network types. The penny dropped when you mentioned 'none-broadcast' refers to same network type that cannot support broadcast and multicast packets. Thanks for putting this together. Mike (England)
Very well explained
I loved all your explanations.
Cheers Alex. Thanks for the kind words & support.
Great Work. Thank you
Thanks brother your teaching
Is excellent 👌👌 as well as information
Thanks for the kind words =)
That was a great help. Thank you for your efforts.
You're very welcome =)
You are the best. Thank you
Very informative, thank you
You're welcome, Adrian.
Full OSPF Series available here --> Pracnet.net/ospf
Hello!
Thank you for the best explanation and the best documentation.
The illustrations are very clear.
Thanks for the free environment to learn high quality content.
Even if you charge for it I will still support you!
Thank you for the kind words =).
I'm hoping I don't need to charge, but if I can't find favor w/ the YT algorithm, I might instead switch over to Udemy, or something. =/
@@PracticalNetworking
If you were to become a Udemy instructor
That would be great!
I hope it is! =)
@@kajupu2275 I already have a few courses on Udemy if you want to check them out. And a few on my own site:
classes.pracnet.net/
www.udemy.com/user/ed-harmoush/
Thanks for the great explanation 👍🏾
You're welcome =).
You're really amazing Sir. As always you cleared my all doubts about ospf.
Awesome. Glad to hear, Rudra. Cheers!
Thank you Practical Network ✌️👍
You're welcome, Nirav =)
excellent stuff
genius, brilliant. Thank you for sharing this
You're very welcome =) Thank you for supporting the channel.
You're the 🐐! You're good. Thanks.
Cheers, Azza =).
Great job Ed, I too had that same outlook on the ospf while studying. I know the answers to all the questions such aa Boson netsim, although I couldnt quiet fully picture and visualize the whole topology. I think you have done very well with explanation/demonstration on subject/s like I mentioned the same sentiment on VLSM and route summarization....Thank You yet again! Btw I will definitley share w anyone who needs tutoring as well!
Thank you for the kind words, and for supporting this channel by spreading the word about this content. Cheers!
Thanks, well explained
You're welcome =)
Ed, that was awesome. Thank you.
You're very welcome, Joe. Glad you enjoyed this method =)
Wow thanks buddy you really did that so well as you said in the start of video.
Thank you so much
Thanks Ed. Hopefully EIGRP/ BGP are also in the pipeline :)
You're welcome!
BGP, probably =)
EIGRP... probably not videos... but I did write some EIGRP articles you might be interested in:
EIGRP Explained : www.practicalnetworking.net/stand-alone/eigrp-terminology/
EIGRP Metric : www.practicalnetworking.net/stand-alone/eigrp-metric/
EIGRP Feasibility Condition: www.practicalnetworking.net/stand-alone/eigrp-feasibility-condition/
@@PracticalNetworking Hi Ed, you explained OSPF in a straight and easy to understand. Hope BGP will be the next. Thanks so much and more power!
one of....no no no this is the "best" explanation about network types in ospf!!!!
yes, the best explanation you can get regarding "OSPF Network Types".
Thank you for the kind words, Luca. & Sinade =)
Once again, thank you.
Cheers Azza =)
Thank you so much sir, I really learnt from you, I wanna say that I am working into palo alto Tac engineer now
Awesome, Arun. Glad you're learning. If you're willing... I'm sure some of your peers at Palo Alto could benefit from this content =). Sharing the series would be greatly appreciated. (Use this link: pracnet.net/ospf )
I'm just commenting to help you with the CZcams algorithm. Thanks for making this video
Hi, This entire series is Good , Could you upload the same as well video series BGP,MPLS ASA Firewall
Glad you've enjoyed it, Govind =). Noted about BGP/MPLS.
For ASA, you might be interested in my ASA NAT course: classes.pracnet.net/courses/nat-on-a-cisco-asa-firewall
Hello.
With all due respect.
Let me quote from the Cisco community forum:
"Speaking of next-hop for link state protocols is not appropriate and it can be misleading.
The next-hop in OSPF or IS-IS is not the device from which the prefix was received but it is the device on the best path to destination."
I totally agree with that
Thank you Sir ❤️
You are awesome bro.. you are the best
Thanks a ton !
You're welcome =).
PS: Lesson 14 just released =)
Follow the money. Cisco, the greatest inventor and provider of networking information has NO financial interest in OSPF. In fact, with DNA, they have revived the dead ISIS and with it, EIGRP. Great university level information on those but, OSI of IETF? No corporation cares. I´m so incredibly grateful to you for doing these videos. You literally are positively affecting the quality and sanity of my life, and many others. I hear Patreon pays well. My Spanish teachers have said they would have quit without Patreon as an addition to CZcams. I want to see you successful! You´ve made my retirement possible and I don´t forget things like that. If you´re looking for a great Spanish teacher, I´m a super person to start with.
Thank you for the kind words. I am very happy that you are benefiting from this content.
You did wel very significant eplanation
Thank you, Kheloui =)
Thank you so match❤
You're welcome 😊
Thank you Sir🙏🙏🙏🙏
Amazing video 👍🏻
I would highly appreciate if you cover ISIS / BGP / MPLS in-depth as well.
Glad you enjoyed it, Khurram. One step at a time =) Let me finish OSPF, then I can move on to the others, but yes, they would be fun to do.
Yes that would be great
good job
thank you
YOU ARE SUPERB 👍👍👍
This is why you're the goat
Thanks,, Ed
You're welcome, Peter =)
Hi Ed, thankyou for creating such a nice presentations❤, and explaining well. How do you make these beautiful presentations?
And I'm hoping you'll be uploading BGP sooner
Thank you for the kind words, Latheeswara =). I use PowerPoint... it can do _soo much more_ than the common "death by powerpoint" presentations. =)
Great explanation.
You mentioned that these connections will have the same subnet then you said that most probably this connection will be via WAN which is true and we know that you can not get WAN links with the same subnets in different locations. I think you must mention interface tunnels or something similar that will allow having the same subnets over the WAN.
Whether you're using interface tunnels, or have something sorted with an ISP is somewhat beyond what I wanted to get into for this video (since it isn't a WAN video as much as an OSPF network types video).
Generally, if the IPs at each WAN site are *not* the same, then you'd likely have a collection of Point to Point networks, as I mentioned in the video =). Cheers.
great
Thanks Bro..
U r a gem. Great help.
Simple explanation, and my brain can take it😅.
Can U please make videos on topic like redistribution, Virtual link etc....
When U have time.
🙏🙏🙏🙏🙏🙏
Thanks for the kind words. Redistribution is on my list. Virtual Links, I haven't decided yet.... I'm not sure how important they are outside of certifications / academia.
As usual, excellent, clear, and well illustrated content! 👍 Thanks, Ed. It isn't totally clear to me still, though, as far as the NBMA manual config of neighbor IP. In the example, you said, ' on R2, manually config the IP of R4, and that will prompt a response from R4...'. 1) doesn't that (manual config) sort of defeat the purpose of OSPF, or does it maintain adjacency on its own via LSUs after init discovery? And 2) how would you manually config R4 address on R2, thru an IP OSPF statement ? (I forget exactly the command, but it's more specific than a network statement). As for the 'conundrum' of the next hop on a P2MP design, I assumed it would be the hub (so that felt good to get right 😄) , but, yeah, the manual config bit "throws me" a little.
As always, thanks so much for such awesome content, and I'll share it as far as I can.
Good questions!
1. Yes, maintaining the neighborship _after_ the manual IP configuration is done automatically. The manual configuration just solves the problem of "how do we discover if another OSPF router is on this link."
2. The command is simply: "neighbor x.x.x.x" inside the OSPF process =)
Congrats on solving the Conundrum of Next Hop IP on P2MP.
you just continue to inspire me..!!!
Would there be any practical advantage in using the (non-default) configuration of point-to-point ospf network type for point to point ethernet links between two routers, instead of the (default) broadcast network type?
Manually setting them as Point to Point spares you from the DR election, and therefore the WAIT timer to see if a DR already exists. So the link will come up and adjacencies will go to to FULL quicker.
Hello , it was wonderful presentation. Can you tell me what is the exact difference between broadcast and non-broadcast network type practically.
nice
amazing man, try BGP & MPLS for CCNP level if possible please. Thank you.
Glad you enjoyed it =). Noted about BGP / MPLS =)
I learned by text descriptions, but those were not easily digestible. Memorizing bullet points for some test doesn't mean you actually can make use of the information. Yes, memorization is part of it, but the everyday use and application of the topic plus the explanation of why it exists (what purpose does it serve) is also important.
Thanks for making such an informative videos. Your last comment shanked my concept about ospf where you said ospf is rarely used in wan these days. According to my understanding with in any autonomous system ospf provides routing between many many routers and obviously this autonomous system could be intercontinental. Only inter autonomous Communication triggers bgp. Even mpls service providers that might be continental use ospf between their routers according to my knowledge. Can you clear this up to me. Waiting for your reply.
Yes.. it's too Good.. I looked on your website to purchase CCNP content but it is not available
Glad you enjoyed it. I don't currently have CCNP content on my website =/
Hi I have watched all your videos
Can you make same kind of series for BGP also
Thank you for the great lessons. As with the hub topology, how would that be wired in an actual real-life situation? If you have a router connected to two or more routers in a hub and spoke topology, would a serial or ethernet cable with multiple branches be used? In other words, in the hub diagram you have, how do the three cables to R2, R3, and R4 merge together? Do they meet in an actual hub? Or the cables simply go from one strand to three strands?
Glad you've enjoyed it.
Hub/Spoke is more of a WAN concept. So it isn't physical connectivity connecting the devices.
It's a cable from each location's Edge router that connects to an ISP, and the ISP does some "WAN Magic" to interconnect the different branches. So it isn't _physically_ a Point to Multipoint link, it's _logically_ a point to multipoint link.
@@PracticalNetworking Alright, got u. Thanks brother!
@@seanknight9808 You're welcome!
Great job and sharing, can you do the same Practical BGP and share please?
BGP is on the list, but there are a few other projects in front of it, I'm afraid.
@@PracticalNetworking very exiting with this, hope you can done BGP soon :)
You got any videos on dhcp? Im trying to learn ospf but I wanna learn dhcp too
I briefly discuss DHCP here: czcams.com/video/E5bSumTAHZE/video.html
❤❤❤
Love from Pakistan
i think lesson 12 is skipped or may be an error
Lesson 12 is available in my CZcams membership... and it seems you've already found it. Let me know if you have any other questions.
2137
This is a great video
he has really big eyes
;)
Bruh whats the full form of OSPF
Thankyou so much i was going crazy trying to rap my head around this subed.