📌 *More free preview lessons from the Practical OSPF course:* pracnet.net/ospf 📌 *Want even more? Check out the full course:* pracnet.net/ospfcourse 📌 *CCNA Resources:* pracnet.net/ccna 📌 *Learn Networking:* pracnet.net/nf 📌 *Learn & Practice Subnetting:* subnetipv4.com
Dear Mr. Harmoush, you're truly a master in this profession. You're sincerely a teacher, and you indeed "have a passion for teaching complicated topics in simple, approachable language." Thank you.
Again, so far, Mr. Harmoush, you're the best teacher and master in this field, you are really passionate about teaching, you cover entierly the topics and simplify them in such an easy way, and the illustrations are of high quality. Thank you so much for what you're doing and hope to see more content !
Oh boy! :) being ccnp for 10 years and sometimes need to refresh some stuff i dont work with. Anyway, your ospf videos are the best i have ever seen :) many thanks from Prague
@@PracticalNetworking I have read several network CBT from INE, IPTV Pro, CBT Nugget, Udemy for CCNP approach. I really think your videos are on the top of quality and your unique analysis to explain the theory is the best among them. You deserve to set a paid platform to charge a fair fee for the advanced program on this quality and effort.
@@randyyihsienhan Thank you for the very kind words Randy. I'm looking to start doing more in the online course space, so look out for that soon. I already have a few courses published here: classes.pracnet.net/
wonderful video sir Eddie! I am new to this field yet you made it easy for me to learn, I was about to stop pursuing this field (because it was hard to follow through the books and videos) but you brought this passion back to life.
I really enjoyed your video, it was very clear and helpful. You have a great way of explaining things and making them easy to understand. I would love to see more videos from you, especially on BGP. That's a topic I'm very interested in and I think you could teach it well. Thanks for sharing your knowledge and skills with us.
LSA type Type 1 LSA: Router identifies itself and it's links - IP Networks/ Subnet Masks Costs for each Router Link - Used to build typology map of local area Type 2 Network LSA: Sent by Designated Router (DR) - When multiple routers connected to the same multi-access link Type 3 Summary LSA: Contain IP Networks from foreign areas - Sent by ABR in both directions - Summaries Type 1, Type 2 and Type 3 LSAs Type 4 ASBR Summary LSA: Instructions to reach ASBRs - Send by ASBR Type 5 External LSA Contain an IP Subnet redistributed into OSPF - sent by ASBR - Forwarded unchanged throughout OSPF domain
@@PracticalNetworking Just a quick question though , ED. If Totally stub Area doesn't allow type 3 LSA's , why does it allow one to be injected to give the default route? (assuming i have understood correctly of course)
@@Don-Carillo That default route Type 3 is the exception. It's the only TYpe 3 allowed in a "totally stub" area. If that didn't exist, none of the routers in the stub area would have any routes to _any_ subnet elsewhere in OSPF.
Thank you very much Ed... Very clear explanation... Can you please also cover the route aggregation, redistribution and filtering topics in OSPF. Really appreciate. Thank you!!!
Those are on the list! Glad you've enjoyed these, Geetha. 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_ .
Out of curiosity; What sort of case by case approaches are you referring to regarding getting type 5 routes from another area (area 22) into the NSSA? I’m referring to a scenario where no default route is injected. Are we talking simply using static routing instead or is there some sort of OSPF trickery that can be done ? Amazing content, as always!!
I have a question; in a previous video you mention that type 5 LSA are forwarded by ABRs only. Assuming area 0 links are P2P, how do the Type 5 LSAs in this video reach Area 33? If I understand correctly, they are first forwarded by R2 and R4 from Area 22 and Area 44 respectively into Area 0. From here, how do they reach Router 3 for them to be forwarded to Area 33? They can't be forwarded by R1, can they? Thanks for the lessons!
I feel a bit confused here: Are these AREA types the same as the LINK type of a link advertised in an LSA? in other words, is a stub AREA the same as a STUB link/network? What if R6 didn't exist, R3 had a stub link/network instead, and was also part of Area 0? would that mean that R3 had a stub network/link inside a normal (non-stub) area? How does a router know what type of area that is? is it specifically configured or automatically determined? How does the LINK (stub, transit, etc.) and AREA types (stub, NSSA, etc) correlate to the NETWORK (broadcast/point-to-point, etc) type?
Good question. No, the _Link types_ are different than the _Area Types_ and different from _Network Types_ . There is some overlap, but for learning I think it's best to understand each of these as completely separate independent topics. It's unfortunate OSPF used such similar terminology for each, it leads to confusion. The video on this series on Type 1 & 2 LSAs will go into more detail about Link types.
@Practical Networking: what is the benefit of changing an area to NSSA when type 7 lsa will be translated to type 5 lsa... why not keep it a regular area?
Ed, I don’t get the point. If that needs to achieved ABR of Area 44 should inject the Default route using Type 3 LSA for to reach other areas. With Type 5, I have 100 routes and with Type 7 also, I have the same 100 routes. Why can’t just have Type 5 and inject a default route to reach other areas. I am confused by the usage of Type 7 LSA.
A stub area, by definition, has only one way out. So it is safe to assume a default route should point to the ABR. In an NSSA area, there can be two ways out (the ABR, or the Redistribution Router). Therefore, OSPF can not assume where to point the default route, so doesn't inject one by default -- leaving the administrator to define where the route should point.
@@amitpatil1900 "Totally" NSSA is a Cisco implementation, you'd have to ask them why they chose to include a default route by default. I assume it's because without it, you'd lose access to all the networks you would have learned about from the Type 3 LSAs (which are removed in a Totally NSSA area).
📌 *More free preview lessons from the Practical OSPF course:* pracnet.net/ospf
📌 *Want even more? Check out the full course:* pracnet.net/ospfcourse
📌 *CCNA Resources:* pracnet.net/ccna
📌 *Learn Networking:* pracnet.net/nf
📌 *Learn & Practice Subnetting:* subnetipv4.com
Totally!
@@parheliaa ;)
This is the best and easiest video to understand about LSA that can be found on the web imo.
The Best video abou OSPF i have ever seen, Excellent video
Dear Mr. Harmoush, you're truly a master in this profession. You're sincerely a teacher, and you indeed "have a passion for teaching complicated topics in simple, approachable language." Thank you.
Thank you for the kind words, Azza =)
Probably the best video on OSPF areas.
Again, so far, Mr. Harmoush, you're the best teacher and master in this field, you are really passionate about teaching, you cover entierly the topics and simplify them in such an easy way, and the illustrations are of high quality. Thank you so much for what you're doing and hope to see more content !
This video is the best! What a banger covering these topics. Keep it up bro
Excellent explanation and clearly presented. Thank you for speaking at a normal pace and the content your providing.
Oh boy! :) being ccnp for 10 years and sometimes need to refresh some stuff i dont work with. Anyway, your ospf videos are the best i have ever seen :) many thanks from Prague
Awesome explanation …I was struggling to get these concept for last 2 -3 years .
Glad it finally clicked =)
Best ccna content on youtube 👏
Finally I have understood these confusing ospf area types after watching this video, thank you.
You're very welcome, Randy. =). It's been neat seeing your comments on these videos =)
@@PracticalNetworking I have read several network CBT from INE, IPTV Pro, CBT Nugget, Udemy for CCNP approach. I really think your videos are on the top of quality and your unique analysis to explain the theory is the best among them. You deserve to set a paid platform to charge a fair fee for the advanced program on this quality and effort.
@@randyyihsienhan Thank you for the very kind words Randy. I'm looking to start doing more in the online course space, so look out for that soon. I already have a few courses published here: classes.pracnet.net/
wonderful video sir Eddie! I am new to this field yet you made it easy for me to learn, I was about to stop pursuing this field (because it was hard to follow through the books and videos) but you brought this passion back to life.
Thrilled to hear that =)
It would be cool if you do the same course but for EIGRP and for BGP as well . Best networking professor by far
Glad you're enjoying these, Rocio. I do have some EIGRP content published:
Understanding EIGRP - 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 what about IS-IS ? i'd love IS-IS course in the same didact way you've done this OSPF course.
Great teacher, love your diagrams and how much effort you put into teaching to make something so simple. Thank you!
Glad to hear from you clarification on OSPF area type
Absolutely perfect explanations, as always. And just the topic I needed at the moment. Thank you, Ed!
Glad there was good timing =). Cheers, Zvonimir!
Love from India, waiting for your content ☺️
Yes, I'm also
Cheers, from Seattle =). Hope you enjoyed the video!
Cheers! =)
Informative. I am getting addicted to it.
Awesome =)
excellent presentation of complicated OSPF area types.
Precise explanation and perfect to grasp.
I really enjoyed your video, it was very clear and helpful. You have a great way of explaining things and making them easy to understand. I would love to see more videos from you, especially on BGP. That's a topic I'm very interested in and I think you could teach it well. Thanks for sharing your knowledge and skills with us.
Noted, thank you for being a supporter of the channel. I would love to publish some of my BGP related content on the channel.
The best video on area types!
Thank you, Bill. =)
It was a very nice and understandable tutorial.Thank You
LSA type
Type 1 LSA: Router identifies itself and it's links
- IP Networks/ Subnet Masks Costs for each Router Link
- Used to build typology map of local area
Type 2 Network LSA: Sent by Designated Router (DR)
- When multiple routers connected to the same multi-access link
Type 3 Summary LSA: Contain IP Networks from foreign areas
- Sent by ABR in both directions
- Summaries Type 1, Type 2 and Type 3 LSAs
Type 4 ASBR Summary LSA: Instructions to reach ASBRs
- Send by ASBR
Type 5 External LSA Contain an IP Subnet redistributed into OSPF
- sent by ASBR
- Forwarded unchanged throughout OSPF domain
Thanks for incredible teaching 😊
Thank you Ed for clear explanations , love from India
Cheers, L. Glad you enjoyed it =)
Loved it, Great Explanation!! Request you to complete Network Fundamental Series. Thank you Ed!!
Cheers, Amit =). Noted =)
Great explanation. Thank you for the hard work!
master at work . This is the one i was most confused about , well explained
Glad you enjoyed it Don. =) Cheers !
@@PracticalNetworking Just a quick question though , ED. If Totally stub Area doesn't allow type 3 LSA's , why does it allow one to be injected to give the default route? (assuming i have understood correctly of course)
@@Don-Carillo That default route Type 3 is the exception. It's the only TYpe 3 allowed in a "totally stub" area. If that didn't exist, none of the routers in the stub area would have any routes to _any_ subnet elsewhere in OSPF.
@@PracticalNetworking makes sense. Thank you
@@Don-Carillo Cheers, Don =)
Great lesson! Thank you
Amazing work, you helped me a lot
The content is o rich. I watched the video and helped me a great deal. thanks you are awesome
Thanks a lot for your time and knowledge man!
Thank you very much for this explanation.
Awesome videos, Thanks ED!
You're welcome, Nasir =)
Excellent video.
Thank you, WIllie =)
Thank you for your detailed videos ☺️
You're very welcome. Cheers, Ratheesh!
from today i will watch your video only....thanks for making me understand easly... let me know how to ba amember for your channel
Thanks for the great explanation 👍🏾
You're very welcome, WemDizzle =)
Kindly make videos on EIGRP and BGP in the same fashion like segregating concepts and deep dives so that it would be clear to understand.
Fantastic explanation, I hope you do the same for BGP someday.
Eventually, I will. Glad you enjoyed it! Thank you for supporting the channel!
Thank you very much Ed... Very clear explanation... Can you please also cover the route aggregation, redistribution and filtering topics in OSPF. Really appreciate. Thank you!!!
Those are on the list! Glad you've enjoyed these, Geetha.
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_ .
This is Awesome!
Very good video, thank you so much! It helped a lot
Question?
what is the difference between the Normal Type 5 LSA and translated Type 7 to Type 5 LSA ?
Hi, great graphics, may i know which software or application was it prepared on?
Love you bro
Best explanation!!..Can you do some videos for L2 Protocols? ie. Spanning Tree???
😊 THANK YOU SOO MUCH
Cheers, Kimo. Glad you enjoyed it.
awesome
Out of curiosity; What sort of case by case approaches are you referring to regarding getting type 5 routes from another area (area 22) into the NSSA? I’m referring to a scenario where no default route is injected.
Are we talking simply using static routing instead or is there some sort of OSPF trickery that can be done ?
Amazing content, as always!!
Thnks
I have a question; in a previous video you mention that type 5 LSA are forwarded by ABRs only.
Assuming area 0 links are P2P, how do the Type 5 LSAs in this video reach Area 33?
If I understand correctly, they are first forwarded by R2 and R4 from Area 22 and Area 44 respectively into Area 0.
From here, how do they reach Router 3 for them to be forwarded to Area 33?
They can't be forwarded by R1, can they?
Thanks for the lessons!
Pls differentiates the E1 and E2 routes in ospf
How can i access the deep dive videos?
I feel a bit confused here:
Are these AREA types the same as the LINK type of a link advertised in an LSA? in other words, is a stub AREA the same as a STUB link/network?
What if R6 didn't exist, R3 had a stub link/network instead, and was also part of Area 0? would that mean that R3 had a stub network/link inside a normal (non-stub) area?
How does a router know what type of area that is? is it specifically configured or automatically determined?
How does the LINK (stub, transit, etc.) and AREA types (stub, NSSA, etc) correlate to the NETWORK (broadcast/point-to-point, etc) type?
Good question. No, the _Link types_ are different than the _Area Types_ and different from _Network Types_ . There is some overlap, but for learning I think it's best to understand each of these as completely separate independent topics. It's unfortunate OSPF used such similar terminology for each, it leads to confusion. The video on this series on Type 1 & 2 LSAs will go into more detail about Link types.
Another superb lesson. thank you. I'm just checking out your website also. Allot of good content on there. Might even get my wallet out :)
Sir, if area 44 NSSA doesn't allow type 4 LSA how routers of other area going to know about ASBR location (Earlier we learned about ASBR summary LSA )
@Practical Networking: what is the benefit of changing an area to NSSA when type 7 lsa will be translated to type 5 lsa... why not keep it a regular area?
Because it spares the NSSA from having to maintain the Type 5 LSAs from _other_ areas (i.e., the 100 Type 5 LSAs redistributed from R5)
@@PracticalNetworking Thank you.
@@wizix9877 You're welcome
Ed, I don’t get the point. If that needs to achieved ABR of Area 44 should inject the Default route using Type 3 LSA for to reach other areas. With Type 5, I have 100 routes and with Type 7 also, I have the same 100 routes. Why can’t just have Type 5 and inject a default route to reach other areas. I am confused by the usage of Type 7 LSA.
Why NSSA Area ABR not send default route explicitly inside NSSA area? any reason ?
A stub area, by definition, has only one way out. So it is safe to assume a default route should point to the ABR.
In an NSSA area, there can be two ways out (the ABR, or the Redistribution Router). Therefore, OSPF can not assume where to point the default route, so doesn't inject one by default -- leaving the administrator to define where the route should point.
@@PracticalNetworking Thank you!! how about Totally NSSA?
@@amitpatil1900 "Totally" NSSA is a Cisco implementation, you'd have to ask them why they chose to include a default route by default. I assume it's because without it, you'd lose access to all the networks you would have learned about from the Type 3 LSAs (which are removed in a Totally NSSA area).
@@PracticalNetworking Thank you!! I understand that, just want to confirm is there any reason behind that.
14:01 Michael Scott screaming No God No, Please no !
Great video. I love watching your content