Configure and Troubleshoot OSPF | Cisco CCNA 200-301

[@KeithBarker]

This just in! What a person trims the beginning of a live stream, the Live Chat Replay is then no longer available. Had lots of great ideas posted, regarding the questions at this timestamp: kzbin.info/www/bejne/f4LNYph_rd5sebM Asking for a title and topics for a new live stream. Take a moment, check out the video at that timestamp of 1hr (link above) and I would love your feedback. Thanks, and happy studies!

[@jorgegilhuawei1622]

Keith let me tell you something frankly: this class has been amazing! Just the way how you explain is beyond the best! Thanks for this wisdom and for helping people like me. For your idea about livestreams is for me wordless and i will think in a topic to challenge us

[@KeithBarker]

Wow, thanks!

[@erickmiller5309]

I am in the process of getting ready to convert my flat 2 layer network to a Layer 3 using OSPF and I love the fact that you are covering Layer 3 using OSPF. I think I have watched just about everything you have listed on CBT. You were by far my favorite instructor on there. Love your teaching style, your examples, and how you can convey the information not only quickly, but you make it fun. I have just recently found you on KZbin and I will be honest, very happy to see all the videos you have posted. Thank you for taking the time and providing so much valuable information here. You ROCK young man !!!

[@KeithBarker]

Thank you Erick Miller!

[@2090ification]

Hey, Keith I really do appreciate when you teach these concepts. They are really helpful.

[@KeithBarker]

Awesome! Thank you!

[@ardentdfender4116]

In actively currently studying for my CCNA which is fully like learning another language and I don't even work in IT, but in Industrial Controls Systems Automation I fully appreciate your training. We all have our favorite personalities and channels for each of our own reasons. Everyone has a different teaching style and anyone you can also learn something from. Always good to sample and learn. However, one thing I appreciate about you Keith, is that you do not assume we already know the topic at hand in the video. You try and explain as if the person does not yet know unless it was covered earlier in the video or previous connected video. But you explain what I call the Nuts and Bolts in details for a person to understand. So many others explain stuff that goes way over your head in trying to explain something. But you try to keep it simple and even use props to explain. Them Cups are awesome to convey concepts. You usually try to cover everything. But what I also do appreciate allot is when you try to look thru the details of a summary brief command like around 32:00 to 34:00 you take the time to explain what the really important elements of that summary brief mean. I appreciate that and I'm sure others do as well. Many new to Networking or less knowledgeable have no idea what all that spitfull of information dump from the Router means. It just looks like a lot of stuff and numbers. Many others ignore the viewer knows what it means just doing the commands. But you take the time to highlight what's important there and explain what you're looking at means. Thus we learn to recognize as well how the information is presented and read. And I guess that's some of the huge reasons I enjoy your channel a lot more than others. I still watch others. But I know if you're doing a topic, your going to try and explain what I call the Nuts and Bolts to make things understandable. And I guess, that's why we sink an entire 30+ minutes to over an hour to get the technical learning correct.

[@KeithBarker]

Wow, thank you for your time and feedback, I appreciate you. Over the weekend, I did a couple live streams including the subnet "Block Size" video. In that stream, ogit.online/block-size , I tucked in some additional insight on loopback interfaces, specifically thinking of you and your questions about them. Hope it was useful, and am so grateful for your feedback and having you participate on this channel. Keep the questions coming, and thanks again.

[@zoltron30]

I've read Cisco and Sybex books but I've never understood OSPF so clearly now after watching this video. Awesome stuff!!!

[@KeithBarker]

Glad you liked it!

[@ardentdfender4116]

Completed all 4/4 of nothing but your recent CCNA 200-301 OSPF Videos today, over 4+ hours. These videos do a lot in supplementing, solidify and gaining a very good understanding of the various topics in the CBTNuggets CCNA course, most especially the harder to comprehend topics. They are quite a detour in progressive study time on topics going back to supplement with some of these specific videos, for solid understanding. They help greatly. It's also like a long review. However, I'm also picking up little nuggets that I wouldn't have paid attention to if I was just watching this video without purpose. I've consumed just 3 days being stuck on OSPF alone, going over these videos instead of going on to FHRP in the CBTNuggets course. OSPF is like a grand headache. I would say between both pieces of training I have a better understanding, short of fully understanding "Loopbacks". It's like asking why does the Sun exist and what purpose does it serve. Well, let's list off all the reasons and the purpose and benefit it serves. I cannot exactly decipher that on Loopbacks, other than that small piece of nuggets you mentioned about Router with OSPF election for an ID.

[@KeithBarker]

Thank you Ardent Dfender! Sounds like you are putting in the time and effort, and it is worth it. Great job. In the stream over the weekend on block size, ogit.online/block-size I added some more details regarding loopback, with the hope that it will continue to assist you in your learning. Thanks again, and see you in the next video. I hope this has been informative for you, and I'd like to thank you for viewing. :)

[@darshanaher1274]

Hey @Keith, Just finished watching all 3 videos on OSPF, great refresher and awesome work with the cups example while explaining LSA ;-) now i am going to finish the remaining LSA types and re do the LAB for multi area configuration and verify. Thanks for always motivating us. Keep rocking!!!

[@KeithBarker]

Happy to do it, thanks for the feedback Darshan.

[@succubus6031]

I honestly wish you were my teacher lol You're entertaining, your analogies are amazing, you are clear, concise and give tips about efficiency..Thank you for sharing your knowledge! :)

[@CheesieGamer]

This was nice! OSPF is a cool fella in CCNA

[@AbdulAhmed-gx2rh]

It was a great challange, for troubleshooting OSPF Protocol. It was really a sensational tutorial. Thanks Barker.

[@KeithBarker]

Thank you Abdul!

[@darshanaher1274]

@keith As I said earlier finished my OSPF multi area lab couple of hours back. This videos provided me clarity of ospf database, amazing content 😍 I am grateful for it thank you keith ✌️

[@KeithBarker]

Awesome! Thank you Darshan! Glad it was useful.

[@networkingasahobby3887]

high quality materials ! very good explanation !

[@KeithBarker]

Thanks a lot!

[@mikeforslund7375]

Always great stuff from you Keith...Thank you...You Da MAN!

[@KeithBarker]

Thank you Mike Forslund!

[@itsupport9834]

Hi ill just do it the truoble shoot what i am say is every milisecond in configuration is important by the way thank you Keith and good bless

[@ruthcenisantos2]

Wow what an energy! So easy to follow! Thank you! :D

[@KeithBarker]

Happy to do it, thanks for the feedback Ruth Cenisantos.

[@semtex6412]

as always, very clear and concise delivery of a very important topic! noobs and intermediate levels shouldn't have it any other way. a great big thanks from all of us, Sir! man, this place really IS A GOLDMINE! additionally, an awesome "bonus" on your explanation of trace route on 38:16, i didn't know that was how route tracing works - by sending packets starting w/ a TTL of 1 gradually incrementing it by 1 and routers reporting back after having killed them. i was like... "holy crap balls, that makes sense!". lol just a quick one tho, good Sir.. if you hadn't used the switch "-P 1", what difference would it have made? i mean, with all (Layer4 ) things considered.

[@KeithBarker]

Thank you Sujirou! The -P 1 uses ICMP, and it removes an error that is sometimes sent back from the last device in the trace, regarding a message of port unreachable (TCP or UDP port that traceroute was using). It works either way. Happy studies! 😀

[@semtex6412]

@@KeithBarker fantabulous! thank you, Sir! :D

[@amitsatyannavar4583]

Hey Keith, Thanks for giving a revision for OSPF. It would be great if you have a video on LSA.

[@KeithBarker]

Amit thanks for your input! That is definitely in my queue. Stay tuned, and thanks for the suggestion.

[@hmar8719]

I am new to ccna and i some what have a better understanding thanks cbt nuggets

[@KeithBarker]

Glad to hear it!

[@juanrebella2589]

Thanks for the masterclass!!

[@KeithBarker]

Happy to do it, thanks for the feedback Juan Rebella.

[@Quick.Adviser]

thanks for your effort, you are so positive I like that !!!

[@KeithBarker]

Thank you Quick Adviser!

[@josephstewart2439]

Great content, thanks for sharing OSPF concepts in such an understandable way. I have a scenario with two Layer 3 switches with 4 SVIs each, both connected to a backbone router via a routed link. How SVIs work in OSPF? Are they used to send "hellos" to the router? I understood the routing relationship is established on directly connected physical interfaces only, correct? I injected all my SVIs into OSPF by declaring them with Network Statements. I realized things were not working because I had declared my SVIs passive. When an interface is passive it will still advertise its networks correct? it is just not accepting Hellos. Sorry about the long question, I just know you will explain it in such a simple way that will help me understand it. Thanks in advance

[@KARMAISABITCHouch]

53:35 this is hilarious :D! This happens to all of us after a long day of troubleshooting.

[@rishabhsaxena9858]

Hi Keith, Firstly I would like to thank you for the wonderful content very helpful. I would like you to have some thing on the IKEV2 configuration. We can name it is as The Improved IKEV2. Tunnel img between router and asa and router to router or asa to asa.

[@mandarsawant7059]

Hey Kirk, Thank you so much for detailed explanation. It would be beneficial if you can post the video on troubleshooting BGP that can be specific to ISP network to Data center network which can cover basic to advanced fundamentals when working in larger size of network. Thanks in advance.

[@KeithBarker]

Thanks for the request. In this channel, I am going to focusing primarily on the CCNA 200-301 for the next several months. After that, I may include other videos. I will keep your idea on my list. Thanks again.

[@sinae7409]

Fantastic like always, thanks a lot

[@KeithBarker]

Thank you too!

[@devdev-ds9xz]

hah I had that question in a two-day interview for job in 1999 for senior network engineer, How does traceroute work?

[@ingowenzel6818]

hi Keith, during watching your formidable podcast, one question regarding the Designated Router arises: in the progress of configuring all routers one by one, was'nt it the case, that the router R1 was set up first and became the DR? as you told, once a router is elected to be the DR and some time goes by, it would stay DR despite another router, router R4 in this case, coming up later in the network scheme has a higher Priortity- or higher Router-ID? thanks in advance for any clarification you can give.

[@KeithBarker]

Thank you for the question Ingo Wenzel. Regarding a single VLAN/Broadcast Domain/With associated IP subnet: A single router, with no other competition will become the DR. A second router, brough up 1 minute later, will be the BDR The DR and BDR will be fully adjacent neighbors A third, forth, fifth, etc routers will become fully adjacent with the DR and BDR, but not with each other. If the DR is lost, the current BDR will be promoted to the DR, and from the remaining routers, the one that will be the new BDR is the one with the: highest OSPF priority for the connected interface (if that is a tie, then) highest router ID If one of the non DR devices comes on line, with a really high (better) OSPF priority, it will not take over any of the DR roles from the existing DR or BDR. Feel free to join my Discord sever. Lots of people there helping each other out. Each Saturday at 10am Pacific I hold my "Office Hour" where learners can ask questions about the topics they are studying. Mostly focusing on Cisco CCNA 200-301 topics. Feel free to join us there live if you are available. Here is the link ogit.online/Join_OGIT_on_Discord Thanks again Ingo Wenzel!

[@ingowenzel6818]

@@KeithBarker hallo Keith, now with your really clarifying answer i was able to get the point. once again, have many thanks for all your actually well-thought-out video tutorials. since viewing them, the puzzle of networking has almost been solved. personally, i wish you all the best for the future and i am absolutely thankful for your help. cheers!

[@jayydon]

I did it! Very cheeky.

[@thilaks8334]

Thank you keith, for the wonderful video on ospf.. Would the next one be EIGRP and load balancing😊

[@KeithBarker]

Thank you Thilak! EIGRP is a great protocol, but it is not on the Cisco CCNA 200-301 blueprint. However, once I have convered most of the CCNA content that I intend to, I will add some content to KZbin on EIGRP. Thanks for the suggestion!

[@thilaks8334]

@@KeithBarker, but why isn't it in the new ccna? That's the IGP Cisco uses. Is it moved to the CCNP enterprise ?

[@KeithBarker]

@@thilaks8334 Yes, the EIGRP is included in the CCNP.

[@thilaks8334]

@@KeithBarker ohkay, could that all the ccna 200-125 candidates studied it, gonna be easy for us in CCNP 😎

[@aljaygonzalo3553]

Every second is worth it.

[@KeithBarker]

Thank you Aljay Gonzalo!

[@aljaygonzalo3553]

@@KeithBarker ❤️

[@paoloderi1245]

No you are wrong. Every millisecond is worth it 😍

[@yacyasma9293]

hi Keith i want really thank you for your presentation. I just want to know, the list of tools that are you using to make those labs on your videos. thank you a gain

[@KeithBarker]

Thank you for the question Yac. I use Corel Painter, Epic Pen, OBS, a Wacom 22 tablet/monitor, and a stream deck. Cheers!

[@yacyasma9293]

@@KeithBarker thanks for that Keith. i want know also about your labs. are you using real router & switches or simulator like packet tracer. again thank you for those videos, and i wish the best.

[@KeithBarker]

@@yacyasma9293 I use virtual gear most of the time. If there is a topic that requires physical gear, I may break it out as well. For the CCNA level, all you need is the free Packet Tracer!

[@yacyasma9293]

@@KeithBarker okay, i already have it. thank you Keith so much for the answer, and see you in the next video.

[@pradyumnakubear8561]

Well you thaught the theoretical concept better than Jermy, I love Jermy's practical sessions

[@KeithBarker]

Thank you @pradyumnakubear8561!

[@HiteshKumar-sp7ls]

Keith promote ur channel soon 1 millions subscriber

[@darshanaher1274]

@Keith I have a doubt more like a question, I think every subnet(network) will have different DR in the OSPF domain or there is only one DR for all routers and all subnets(networks) ?

[@KeithBarker]

Thank you for the question Darshan. Each network that is the OSPF type of "Broadcast" or Non-broadcast" will have its own DR for that network. So if there are 14 VLANs/IP Networks, there will be 14 DRs, one for each network.

[@darshanaher1274]

Thank you for clarifying it.

[@billgoeke9465]

Hey Keith, Love your videos! You make this stuff so much easier to digest. I'm missing something here though. When troubleshooting the connection between R1 and R2, I get why they would not form an adjacency because they were not directly connected(because of the incorrect VLANs set on Switch). But why would R1 and R2 not be able to ping each other using the bottom route(through R3 and R4) since they had a connection and formed adjacencies there(R1 w/R3 and R2 w/R4)?

[@KeithBarker]

Thank you Bill Goeke. Feel free to join my Discord sever. Lots of people there helping each other out. Each Saturday at 10am Pacific I hold my "Office Hour" where learners can ask questions about the topics they are studying. Mostly focusing on Cisco CCNA 200-301 topics. Feel free to join us there live if you are available. Here is the link ogit.online/Join_OGIT_on_Discord Thanks again Bill Goeke!

[@AlfonsoM422]

thank you for the tutorial! for some reason, the command , SHOW IP ROUTE OSPF BRIEF , doesn't work on Packet tracer? can anyone help? thanks

[@majdodeh5876]

thanks

[@KeithBarker]

You're welcome!

[@jasond.8281]

@Keith What about OSPF priority?

[@jaimejrestanislao]

Hi Keith, I just noticed that the command "show ip ospf brief" doesn't work on packet tracer at this time? I just making a topology the same on your video... Your videos are ae very helpful!!! Thank you?

[@KeithBarker]

Thank you Jaime Estanislao! Enjoy the hands on, it will make all the difference.

[@O2C69]

Hi Keith, really great explanations. Can you do a video on the different routing protocols e.g. ospf, bgp, eigrp, ripv2 etc - on when to use (implement) the required protocols on routers. I know there is the 'administrative distance', that has something to do with protocol on when router decided to use the given protocol to route traffic. Is this a good idea for a video explanation? Thanking you in advance.

[@KeithBarker]

Thanks for your input! Some of those are in my queue. For the new CCNA 200-301, there is no: RIP BGP EIGRP The concept of AD comes up a lot though, when there are 2 different sources (like static routes vs OSPF) who are providing information about the same exact network/route. In that case, the routing source/protocol that has the lowest Administrative Distance (AD) is the route that will be used and placed in the routing table.

[@staticr7229]

hi keith im new to ospf thanks for making content easy to understand.. may i ask why r1 and r2 have to be connected to the switch? is it because to prevent a loop?

[@KeithBarker]

Thank you for the question static r. In a lab environment if the two interfaces are in the same VLAN, they could just as well be connected directly together with a cross-over cable. In a production environment, we would be using switches to connect two routers, or better yet, just use multilayer switches to do both the routing and switching. Happy studies.

[@MichaelWeston82]

I can't use sh ip ospf int brief in packet tracer which is what I am using to follow along. Are there any ways to work around this or is that a limitation in PT?

[@KeithBarker]

Thank you for the question Nate D. That is just a limitation of PT unfortunately. You can do the "show ip ospf int" and then scroll through the output. The data is there, just not as concise.

[@hankfoss6401]

Keith, question for you: I was going through the PT Lab 2020-6-18 OSPF TShoot and stuck on the MLS - R2 - R4 optimal route. Can you give me a hint? Stuck on this. Thanks, Hank

[@KeithBarker]

Thank you for the question Hank. Lots of my labs are out there, I don't recall all the details for each of them. If you save the lab at the point you are stuck, and attach it in a DM on Discord, I would be happy to open it up, take a look, and provide you with some insight. Looking forward to helping.

[@jasonliu9744]

Hi Keith, why is there no Show Ip OSPF Interface brief command in my Packet Tracer？ No `brief`

[@KeithBarker]

Thank you for the question Jason Liu. That is a minor limitation of Packet Tracer.

[@MrDimeboy99]

Keith, I'm not sure if you're monitoring this chat anymore, possibly some automatic notification from KZbin, but I'm wondering how to set up an environment like you have without using Packet Tracer as some features in Packet Tracer don't work like they would in the real world. I see you're using MTPutty but wondering what you're connecting to, your own actual hardware or some virtual environment? Thanks in advance and outstanding teaching method, at least for me :-)

[@KeithBarker]

Thank you MrDimeboy99. Feel free to join my Discord sever. Lots of people there helping each other out. Each Saturday at 10am Pacific I hold my "Office Hour" where learners can ask questions about the topics they are studying. Mostly focusing on Cisco CCNA 200-301 topics. Feel free to join us there live if you are available. Here is the link ogit.online/Join_OGIT_on_Discord Thanks again MrDimeboy99!

[@azee6532]

Hi Keith, Great video. I just have a quick question and that is something that often comes into my mind when I see any network topology: 1. Why use switch to connect R1 and R2 when we can connect them via serial cable too or any Fast ethernet cable. 2. When we use these 2 toplogies? R -------Sw--------R Sw------R---------Sw

[@KeithBarker]

Thank you for the great question. Most of the time, the reason for a network is to allow clients to both access and use it. Most wired clients are connecting through a switch, and then routers are available on those local VLANs (either external routers or multi-layer switches with VLAN layer 3 interfaces, SVIs) to perform routing. In a lab with no clients, this topology could be built with a cable between R1 and R2. I added the switch to provide the ability to add additional devices to the network between R1 and R2. Think of the switch as an option to add more devices to that part of the network. Hope that helps. If you have other questions, please let me know. Thanks for watching.

[@djeb2478]

Thanks sir

[@KeithBarker]

Happy to do it, thanks for the feedback Djebbar.

[@islamtoghuj]

27:01 nice triceps

[@mariembuenaventura1278]

Thanks !

[@KeithBarker]

Thank you Mariem!

[@skolarii]

What would happen if I configure the same Loopback address on all 4 routers? Wouldn't the Router IDs clash in the establishing neighbours process?

[@KeithBarker]

Thank you for the question Pranav. 2 directly connected routers won't become fully adjacent neighbors if they both have the same Router ID. If there are routers in the same area with the same router ID, but not directly connected, that causes problems in the OSPF domain as well. Thanks for the question, and happy studies.

[@jamesdossantos1840]

I really like this Time challenge idea as we could also try them our selves please do this - do a DHCP Voip one !!!! (Name - Packet Tracer Panic)

[@sclutzo]

CCNA CRUNCH!

[@KeithBarker]

Awesome! Thank you Steven! I will add that to the list for consideration. Cheers!

[@taiquangong9912]

My favorite protocol is EIGRP

[@KeithBarker]

EIGRP is a fun one, and fast to converge!

[@azee6532]

EIGRP is a hybrid protocol having features of both distance-vector and link state protocols if I am not wrong. It is cisco proprietary and is a very solid protocol.

[@francistony7110]

when will you teach VRF

[@KeithBarker]

Thank you Francis for the suggestion. Currently I am focusing most of my KZbin content at the Cisco CCNA level, but will keep your suggestion in the queue as a possibility in the future. Thanks again for the idea.

[@lekulahowangahaora8733]

What is the DR in OSPF

[@KeithBarker]

Thank you for the question. On an network segment (such as the same VLAN and same IP network, like Ethernet), instead of having all the routers exchange all the LSAs (link state advertisements) with every other router on that segment, instead 1 router (the DR) will establish a full adjacency with all the other routers, to make sure everyone on that network segment gets all the updates. It is like having 1 device (the DR) act as a clearing house for all updates for that network segment. Check out other OSPF related videos from this Cisco CCNA 200-301 playlist ogit.online/sloth Thanks again for the question!

[@lekulahowangahaora8733]

So DR stand for?

[@KeithBarker]

@@lekulahowangahaora8733 DR is an acronym for Designated Router.

[@lekulahowangahaora8733]

@@KeithBarker thanks

[@luigiramirez29]

Packet Tracer Racer

[@shurato00]

The name could be PKT speed run =)