Spanning Tree Protocol (STP) | Cisco CCNA 200-301

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[@gupttura2766]

one of the best ever video tutorial on STP...I learned a lot about this topic. Thank you for using diagrams and and Switches to make things way easier to understand for viewers like me.

[@KeithBarker]

Glad you enjoyed it!

[@christosn.8110]

Wish my English were good enough in order to express to you how good teacher you are (and i'm very strange person when the time comes to rate a teacher). I will only say this: Wish i had a teacher like you in every study of my life. Sorry if my English confused you and thank you very much for helping us.

[@KeithBarker]

Thank you CriNti!

[@sethjones9817]

You have the best pedagogy of anyone in the IT teaching space. Your mnemonics are so memorable.

[@KeithBarker]

Thank you seth jones!

[@hmaldonado77]

You are a natural treasure for us aspiring Network Engineers. Thank you Keith!

[@TheTigermicha]

I watched some Video of your playlist to refocus on specific topics and get prepared for the new CCNA .... and i passed today! Thank you especially for that great video about STP. Now i will always relate GOLF to STP and never forgot the 802.1w Next step is the road to CCNP :) Greets from Germany Micha

[@KeithBarker]

Congratulations Micha Rainman❗ So great to hear, way to get it done. Best wishes on your continued success.

[@hakimkasman]

Really love that energy! Thanks for making networking sounds fun and cool to learn. With this kind of presentation, definitely will attract people to learn networking :D

[@KeithBarker]

Awesome! Thank you!

[@URVlogchannel]

Thanks Keith! finally, you have started putting your own videos on your own channel... we are always learning something from you - Thanks Again!

[@KeithBarker]

Thank you Uditha Fernando! Glad you are here.

[@rotrose7531]

Thank you very much, your teaching style is fantastic, legend teacher on this hard topic of networking. Great!

[@KeithBarker]

Wow, thank you!

[@BenKraal]

I totally agree! Keith you are so enthusiastic and energizing to listen to. I can tell you know your stuff and you have a gift for teaching. Thanks for taking the extra time to explain every little detail and using wireshark to prove theories. Great explanation metafors too. You're the man! Greetings from Sweden/Stockholm

[@aswani3711]

Hi, may I please ask why Wireshark shows the ARP request's Target MAC Address as 00:00:00:00:00:00 when we're actually broadcasting to FF:F:FF:FF:FF:FF? (Video Time - 7:30)

[@KeithBarker]

Great question. In the payload of the ARP request, the device sending the request doesn't yet know the target's MAC address. That is why the target is set (in the payload of the ARP request) to all 0s. The destination in the Layer 2 header is the L2 broadcast of all 1s (Hex all Fs). Hope that helps, and happy studies. :)

[@andersgjerlw9636]

Please do a second session for Spanning Tree. Also show how you do a secondary as in the spanning-tree vlan 10 root primary/secondary. Also mention more in the next STP video for MSTP,RSTP,CST and give us more basic information about the various STP variants so its not just towards the new CCNA 200-301 cert. Also mention the cost of fast ethernet and 10Gbit ethernet aswell. I have watched a STP video from Laz last week I belive, I'm watching yours aswell to see who has the best information and what the other person left out. Maybe little too much of layman term explaining,but overall a good video.

[@KeithBarker]

Thank you anders gjerløw, great idea. I will add that to my list. Glad you are here.

[@abdulrahmanismailali1064]

@@KeithBarker Mr can you please give me your phone number and your email because I have only one question that I do not know how to solve it can you do it for me

[@CableZL]

Hey Keith, you accidentally sorted the first packet capture by the destination column, which is why you couldn't find the ARP request

[@KeithBarker]

Thank you CableZL! You are absolutely right. A quick sort back on the number column, and I would have been home free! Thank you for being here, and for your comments. Much appreciated.

[@ftzx1]

I might not participate in your live streams but I do watch them 3yrs after they're made! 😁

[@KeithBarker]

Thank you ftzx1!

[@eliasassfaw1608]

Thanks for these generous video Keith, it is really fun watching your videos i really enjoy them. keep up the good work. you are the best teacher on networking!

[@KeithBarker]

Glad you like them!

[@tifffranklin4450]

I'm studying Cyber in Australia, and we are studying Cisco packet tracer. If it wasn't for Keith Barker I would not have passed the first Semester. And now I'm doing Semester 2, it's Keith Barker to the rescue again. Thank Keith. So informative and easy to watch. I'm grateful to you (and have recommended this channel to all the students and the lecturers as well!)

[@AttilaM-p6x]

Hi Keith. Do you know of an easy way to reconstruct the switch topology without using CDP or LLDP? Assuming of course that the interface descriptions are also not trustworthy. I think the best way would be using STP output. But I imagine this gets very tricky if only one switch (SW1) connects to the root bridge, while all other switches (e.g. SW2, SW3) reach the root via SW1, by being plugged into SW1 directly. Using only the show spanning tree outputs, I don't see how we could check which interfaces of SW1 switches SW2, SW3 connect to. Although, we could look at SW1's ARP table for that information. Even worse: what if there are additional switches (e.g. SW4, SW5) which reach SW1 via SW2, SW3? Could you perhaps do a demonstration on how to map a network like that? I know it's a bit of a fringe topic, but I'm sure it would be interesting to see. Thank you.

[@ChadwickVonGriffindorIII]

there's some crazy edits on this, at about 10:00 area

[@KeithBarker]

Thank you Gary Pemberton! Always working on doing better. Thanks for the feedback.

[@AhmadSwailem]

Mr Keith, you are amazing Thank you a lot Lots of love

[@KeithBarker]

Thank you Ahmad Swailem! Glad you are here.

[@O2C69]

would it not make sense to have "Root Port" in forwarding state for all vlans in production, instead of per vlan? please advise.

[@KeithBarker]

Thank you for the question. Cisco's implementation of spanning tree for uses a separate instance of STP for each and every VLAN. By default, the device that has the lowest bridge ID (BID) will be the root for all the VLANs. The benefit of changing the root for some of the VLANs is to allow some traffic to flow over layer 2 path A, while other VLANs use layer 2 path B. In multiple spanning tree (802.1W, MST) they use fewer numbers of spanning tree instances, with the ability to train specific VLANs to use a specific STP instance. All those more advanced options are covered in the CCNP level content. Let me know if that helps, or if you have other questions. Great having you in the stream this weekend!

[@O2C69]

Thankyou for your answer, again very much appreciated and your hard work getting the videos together. 🌹

[@O2C69]

what would happen in stacked switched connection?, e.g. each end of ethernet connected to access ports, stp would not block, do we need to enable bpdu guard? or how to stop loop in logical stacked switch? Thanks.

[@justinlang1205]

Keith, you're the best. Love watching your channel and learn about network technology. Great explanation about how stp works. Please continue producing great learning videos for us.

[@neage7171]

aight... I been struggling with spanning tree. came on to find some other sources to figure this out. watched this and did some practice and literally said "Bro do I understand spanning tree now"

[@elvishinojosa4130]

Hey @Keith sw 2 port 1/3 what does 1/3 stand for? from my experience, i thought 1 is the stack in the switch is in and 3 would be the port but what confused me has that on sw2 there is 3/0 and 3/3. Could you explain.

[@iuhihs]

59:59 I assume it should be SW2 3/0 to SW1 2/0? Anyway very sincerely thank you for the video. This is the most comprehensive visualization of STP I have seen thus far. Also, was wondering if you have video on how to identify and troubleshoot spanning tree loop?

[@jessejansen8492]

One of my first time writing a comment, one of my first video's of 1 hour of content which i watched. You're a legend for how you explain all of this, most definitely i am gonna watch your other videos (be)for(e) my CCNA exam!

[@KeithBarker]

Wow, thanks! Welcome Jesse!

[@tippymc4]

Keith, thanks for the content. However, some of your videos have breaks in them. This one, for example, at 9:37 you are looking at the layer 2 speaking about protection like layer 3. Then it cuts to dogs and mushers. Is there any way of getting these videos reuploaded or fixed? Thanks again for everything

[@KeithBarker]

Thank you tippymc4! These were from a live stream, and I don't have a local copy, so no re-upload of the exact content is possible. I will look to see what I can do going forward to prevent any loss of the video or audio. Thank you for your insight!

[@fbifido2]

@32:47 - what about sw1 port 3/2, that's red, so trunking. it should send bpdu ???? @40:04 - bpdu are sent to access access port as well ??? @47:11 - doesn't each port on a switch has it' own mac-address ??? & the switch has a base-mac-address ??? and the each vlan has a mac-address ???

[@kotlagirishreddy4130]

@Keith Baker > Can you please make a video on MSTP as well. I searched for it but not found. If there any can throw that link below my comment?

[@Miochi_fiochi]

Keith or anyone , what is the typical default switching method ? I’m getting contradictions in literature. Cut through is default?

[@SethRaymond]

Best video on STP, apparently the 13 people who did not like this video, still do not understand STP, and most likely failed their CCNA test.

[@KeithBarker]

Thank you Seth Raymond

[@Dansia]

Thanks Keith. Your videos are so well done and well explained. I learn a lot by watching them.

[@KeithBarker]

Glad you like them!

[@samtheking25]

Hey mate, the order of the Cisco CCNA 200-301 is a bit weird, any reason for that order?

[@khulekani_ndlovu]

Thank you Keith for this!! Am currently preparing for my CCNA and Wendell Odom's book got too much into detail and lost me completely on this topic. Now i can clearly understand based on your hand drawn illustrations👏👏👏🙌

[@KeithBarker]

Glad it was helpful!

[@stonesteppin]

Thank You! I'm actually working on Network+ but have been watching some of your videos and they are very helpful. Your positive and happy vibe is very engaging and before I knew it the entire hour+ had passed.

[@KeithBarker]

Great to hear!

[@hammaadhayat3337]

What are the objectives from the video again ? could someone write all objectives done in the video, please?

[@marko514]

Hey Keith, thanks for the wonderful video. A quick question. @43:30, if we assume that everything in this network topology stays the same, except SW3 and SW2 are connected via Fast Ethernet with the cost of 19, SW3 2/3 would still be designated port, we would then put SW2 2/2 interface in a blocking state? Would SW2 3/0 then become Root port, with SW1 0/0 becoming Designated, and SW2 1/3 would become Designated, and SW1 1/2 would become undesignated? Did I guess it correctly? I'm really struggling with this one and I am watching this for the 6th time, but I am eager to get my CCNA and won't give up after a few failed attempts. Thanks a lot, you are an amazing dude!

[@KeithBarker]

Thank you for the question @marko514. Don't have the time right now to go back through that video and perform a what-if. You may want to lab this one up, in packet tracer or emulator, and test your predictions.

[@javierquesadadiaz7852]

Why did you always say i have a pen and o know how to use it Is it because of Jhon Wick movies? Nice content really learn a lot thanks

[@619sdbdub]

You could have short cutted and said that the root port is the switchport connected to the root bridge. But the long explanation is great to know.

[@hamzataleb6002]

Thank you very much Keith. This is the first time I understand how STP works. Well explained!!! Very informative

[@KeithBarker]

Great to hear!

[@asdasdasd-cg6oq]

What is the port number for STP? UDP or TCP 128? Or nothing?

[@SanDiegoSalesAcademycom]

Great+

[@WineTwoThree]

Great vid...but what's up with the edit between 9:30 - 9:54 ? Doesn't make any sense...

[@Ramazan_Durak]

Thank you @keithbarker ! I am studying for CCNA and your videos are really helpful! You are a great teacher! I appreciate what you have done years ago and probably you are currently doing and I am following your unaging videos right now. Question: Some of your videos are somehow cut in between, like if there was a copyright claim or something. I am not sure if I am missing out something, you could check if you want: 9:45

[@KeithBarker]

Thank you @Sallapati84!

[@FaberLSH]

I removed the two connections between the SW1 and SW2 and it worked well!! Why was that two connections necessary? Thank u so much! Your videos really helped me. May God Bless you!

[@KeithBarker]

Thank you for the question @FaberLSH. Multiple connections can provide fault tolerance, and if using EtherChannel it can also provide for additional usable bandwidth.

[@2x2is22]

Keith, here is a question for you. Let's say I configured some kind of Linux device to send BPDU's into the switch I'm connected to at work (disclaimer: would never actually do this). I make it so those BPDU's have the lowest BID/MAC and I actually get all switches on that LAN to recognize my device as the root switch. My device would start getting all traffic on that LAN right? I tried googling this and found nothing. This seems like a major vulnerability here. As old as STP is, I have to believe they've done something to prevent this

[@KeithBarker]

Thank you for the question 2x2is22. Yes, your host could become the root, but as MAC addresses are learned, they are forwarded base on the MAC address table. To solve the problem of an attacker becoming root, there are tools like BPDU guard, BPDU filter, and Root guard which can all help to mitigate that problem.

[@niravchauhan2278]

Thank you for such an interesting session on STP. Btw Nice Tshirt.✌️👌

[@KeithBarker]

My pleasure 😊

[@MariaGomez-lg2ug]

Which Is The Objective Of The Ports Designated In Stp If The Root Port Sends Bddu Also This Has Me Very Confunsed I Look And Search On Internet And I Do Not Find That Doubt??????????

[@KeithBarker]

Thank you Maria Gomez. 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 Maria Gomez!

[@yadeeshalakshan6112]

Hi Sir, I have a small question regarding finding designated port in a network segment...Will the switch with lowest cost of root port to reach the root bridge decides the designated port ? Need a small elaboration about the cost factor to elect the designated port because that part is bit unclear to me.....And the mean time thanks a lot for posting awesome videos and I have learnt so many things on the way of pursuing CCNA and still learning by going through the playlist....Many thanks....🙏🙏

[@KeithBarker]

Thank you Yadeesha Lakshan. 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 Yadeesha Lakshan!

[@michael0o5]

great presentation - I understood root and designated ports MUCH BETTER , and their behavior, vs from content Cisco put into their netacad. loved the 'lowest advertised pot number' nugget, that was NOT in netacad.

[@KeithBarker]

Thank you. Great to see you in the premiere today.

[@arkan7rb]

thank u but its really making my head spin and spin like a loop trying to understand this stp

[@neage7171]

Took my CCNA the other day after coming to this video to reinforce spanning tree concepts and got a pass. this video came in clutch for me on my exam.

[@KeithBarker]

Congratulations @neage7171❗ So great to hear, way to get it done. Best wishes on your continued success.

[@johnnyauom2121]

ALWAYS LEARNING NEW THING EVERYDAY FROM HERE -

[@KeithBarker]

Thank you J AUOM! Glad you are here.

[@moed740]

Yep...

[@PriestApostate]

Question: What does the "ALTN" under the "Role" category - how does that play into Spanning Tree? (Currently at 54:50)

[@KeithBarker]

Thank you for the question Priest Apostate. An alternate port is a candidate for a root port, if the current root port fails.

[@jeevanchaitanyakoppuravuri6018]

This show stopper for STP for me. Everything is explained very well. Interesting part is you can see BPDUs :)

[@KeithBarker]

Thank you Jeevan Chaitanya Koppuravuri!

[@krakit-d9p]

If four switches are part of STP in a segment. How many switches will have blocking ports?

[@KeithBarker]

Thank you for the question @MrZahidazeemi1. Presuming the following: 4 switches only 1 connection each to a common segment/VLAN, with no other interfaces I think the result would be: 1 designated port 3 root ports

[@rosedhessi340]

Hello Keith .. I am very beginner for CCNA study.. so is swtich automatically decided to be Root Port or does we do ( a network person) ?

[@KeithBarker]

The root will be the one with the lowest base MAC address, unless an administrator (a network person) steps in to tweak the values.

[@sunilrayudu6237]

Thank You for the Video. Your New Subscriber from India. Your Videos are Amazing.

[@KeithBarker]

Thanks for the sub!

[@MrDinoDonnell]

Excellent presentation Keith, on STP. Thank you for taking the time to provide a clear picture of how STP works.

[@KeithBarker]

Glad you enjoyed it

[@Dawnofthedead001]

Gid 2/0 was blocking but when you viewed show int trunk it showed all vlans .. this part of the video confused me a bit.

[@KeithBarker]

Thank you Dave. Do you still have a question about that, or are you all set?

[@davidr.flores2043]

Excellent explanation. Many thanks for sharing Keith, God bless you.

[@KeithBarker]

Thank you David R. Flores!

[@TechJedi007]

Would not int 2/0 on SW1 be the root port since it is closest to root and lowest bridge id? and the other interfaces block to that segment to SW2 since it would loop and all other ports are designated?

[@KeithBarker]

Thank you for the question Jorge Pineda. Join me for my office hour on Discord, 10am Sat Pacific time, and I would be happy to elaborate.

[@a.n.7338]

TTL field is only at layer 3 not at layer 2? So the packets broadcasted at layer 2 keeps going around?

[@KeithBarker]

Thank you for the question, and yes! The TTL is in the layer 3 header. There is nothing in the layer 2 frame regarding TTL that can help to kill the frames that have been forwarded over a layer 2 loop in a network.

[@miriamfuentes3034]

Wow awesome video!👏🏻👏🏻👏🏻i will watch it again and again thank you so much!

[@KeithBarker]

Glad you enjoyed it!

[@LG-me2se]

Keith when you were talking about "Cost" at around 22 minutes in what specifically does that mean? Cost of bandwidth? Monetary Cost? Your unique remedial style of teaching is very easy to learn from. was wondering if you offer 1 on 1 online or over the phone coaching?

[@jemuelbjeroham1228]

Hi Keith, Thank you so much for your videos... I have a small query! If SW1 and SW2 are connected via FastEthernet ports, SW1 and SW3 are connected via GigabitEthernet, SW2 and SW3 are connected via GigabitEthernet and If SW2 is Root Bridge, then the Fa ports between SW1 to SW2 will be in blocking state right.

[@KeithBarker]

Thank you for the question Jemuel B Jeroham. Every segment will have 1 designated port. So even on a slower link, 1 device will be forwarding for the benefit of that link. 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 Jemuel B Jeroham!

[@jemuelbjeroham1228]

@@KeithBarker Thank you Keith !! I have joined your Discord Server 😊

[@johnkulow3972]

Awesome video. you really helped me understand DP ports. Thanks

[@KeithBarker]

Glad it helped!

[@yiannisserpico2646]

About 10 days now, my STP studying is paused. Reason: designated port. Cannot understand it. To Google it, see its definition, or in another web page difference between root and designated port, doesn't really say something. It's like a pyramid from, not top to bottom, but bottom to top. Of course, goal, pyramid top, is to login a switch, and command program it for its designated port (if not already done or wanna make some changes). But, in pyramid bottom, in theory, I have nowhere found WHY designated port is ESSENTIAL/NECESSARY. Why its necessary existence? Also, here, I guess in order to understand, LAN segmentation comes into play. Somebody should also know well about switching segmentation. Know very well. Not about IP segmentation. Not just a blueprint with 2-3 switches. A complex diagram with many switches and bridges, would be perfect. Also nowhere found. Another point:too many say that opposite to a root port, there is a designated port. But just say that. Hmm... Here is another question. In general, we have a question chain. That's why a bottom to top pyramid. Designated port:why necessary existence, in lan segmentation, opposite to a root port, why a root port never both root+designated port, and after all that (I do not know if some other is necessary to understanding), so, after all that, the easiest part, top of pyramid, is switching programming. Thank you for time reading! p.s. LAN and in general networking they say is great parallelism to roading. National roads, city roads, etc. Maybe a road example would help understand designated port tagging in a LAN STP topology.

[@KeithBarker]

Thank you Yiannis. Have you watched each of my STP videos here? They are included in this playlist ogit.online/sloth They may help. Happy studies.

[@yiannisserpico2646]

@@KeithBarker Hi Keith. Thank you for your reply. Truth is I have not seen all STP videos in specific playlist. I will for sure seen all of these. But before starting, I think I should study a little more and careful on networking segmentation. It is a basic concept on STP, and if someone should also have in order to understand STP designated ports. Thank you again for your awesome knowledge on IT networking you give us!! No doubt you are a great teacher.

[@ogrimagy]

Thank you keith. Finally I'm able to understand how golf can be played because of STP. Greetings from Algeria.

[@Michael-xb5zq]

Dude thank you so so much for posting all of these videos. You have taught me so much

[@KeithBarker]

Happy to do it, thanks for the feedback Michael.

[@xanvong1501]

Thank you, Keith! you did a fantastic of explaining the Spanning Tree with some humors in it ! like the King Kong for the Root Bridge and the rest are losers..lol..hahaha

[@619sdbdub]

Hi Keith...about 9:47 this video hits a snag. Goes from taking about a L2 header to dogs mushing. Definitely lost me there. But I'll keep on. Great Video as always.

[@KeithBarker]

Thank you Brian Wool!

[@chrisdaugherty8265]

Yeah I noticed this too. Does it a few times in the 9 minute section. Its almost like the video is cut and edited.

[@robinsonsaez3580]

Hi Keith!!! What is the purpose of SW3 on that topology? Thanks.

[@KeithBarker]

Thank you for the question Robinson Saez. SW3 is a multi-layer switch, with trunks to both SW1 and SW2, and also performing layer 3 routing between VLANs.

[@nickcarlton4604]

Thanks for the stream Keith, loving the new CBT Nuggets content!

[@KeithBarker]

Thank you Nick Carlton! Glad you are here.

[@unappetizingtolookat]

Really like the way you teach. You make idiots like me understand the topic hehe

[@KeithBarker]

Thank you F E

[@mnada72]

For the first topology where sw3 was the root and the 2 ports of sw1 connected to sw2 were in blocking state, for that situation if any communication between devices connected to sw1 & sw2 should take place it would be through the root and not directly ... is this true ?

[@KeithBarker]

Thank you for the question Muhammad. Yes. If SW3 is the root for both VLANs, and there is blocking on both the links between SW1 and SW2, then frames being sent between devices from SW1 to SW2 (and back) would flow through the root switch SW3.

[@mnada72]

@@KeithBarker Thanks for the reply

[@thuggy67]

Please reply please !!! I want to do the CCT 100-490 FIRST , SHOULD I !? OR DONT WASTE TIME ?

[@KeithBarker]

If you are familiar with general networking, you can skip the CCT and move right on the the CCNA.

[@thuggy67]

@@KeithBarker thanks much

[@avakashmalaviya5035]

Thanks Keith i have one query.Can root port transmit broadcast packets? if so then root bridge designated port will again broadcast same packet to non root bridge.

[@KeithBarker]

Thank you for the question Avakash. Root ports mean forwarding, and towards the root bridge. Yes, root ports transmit broadcasts. Designated ports are forwarding away from the root. Yes, they forward transmit broadcasts. Here is the catch, a broadcast is not forwarded out the same port that it was received on. Hope that helps, and happy studies.

[@avakashmalaviya5035]

@@KeithBarker Thanks Keith appreciate your response and energy during videos

[@jaydenritchie1992]

so this protocol is similar to active terminators on an automotive canbus network?

[@KeithBarker]

Thank you for the question jayden ritchie. Not sure about how an automotive canbus network operates, so I am not sure.

[@donairecarapichoso2472]

I love you man. No more crying over STP 😆 Great tutorial

[@KeithBarker]

Thank you Donaire Carapichoso!

[@CelestialArchers]

Keith, is Spanning Tree Protocol configures the network for all VLANs at the same time or can we have each VLAN manually configured to use a different switch as a root bridge ? Thanks a lot :)

[@KeithBarker]

Thank you for the question NILESH BAHIR. By default the device with the lowest bridge ID will be the root for all spanning trees, but you can set the priority for specific VLANs on specific switches to change the topology per VLAN.

[@djjayem100]

What exactly do you mean by "Cost"? The shortest path?

[@aswani3711]

Here are my 2 cents based on a brief understanding of this topic... The cost isn't necessarily the shortest path. Considering that a switch may have different interface speeds (anywhere from 10 Mbps to 10 Gbps), we can assume that the faster the interface speed, the quicker data can get from one place to another, and hence less time and resources are needed by the switch to communicate with other devices. We can therefore deduce that the interface having the higher speed would have a lower cost.

[@anapan5677]

could you please post your notes as well

[@tylermourelle8291]

Does STP work between switches that are not the same brand?

[@KeithBarker]

Thank you for the question @tylermourelle8291. Yes. The vendors follow the standards, and as a result, two vendors running the save standard are interoperable.

[@yacyasma9293]

that was a very good lesson, so thank you for that

[@KeithBarker]

Thank you Yac Yasma!

[@flyingscotsman3278]

Keith - This video is excellent and well presented. Thank you so much #Legend

[@KeithBarker]

Thank you Flying Scotsman!

[@flyingscotsman3278]

Hi Keith - When are you coming back on KZbin - Discord - You have literally transformed my learning study path in Networking👍 The live quiz that you used to do on a Sunday was fantastic please bring it back 😊

[@ChasedWheels]

I learned a little bit of STP ✓

[@kevinjackson5191]

Hi Keith, as usual, excellent work :) Question: i have a network of 14 Aruba switches all linked via aging copper cable on a ring network. I'm about to have a fibre ring network built onto it for better speed and reliability and leave the copper as redundancy. So as i see it I will essentially have 2 links to each switch. I assume STP will take care of all this without any fuss? Your advice would be most appreciated. Cheers :)

[@KeithBarker]

Thank you for the question Kevin Jackson. I am not sure.

[@not_legal77]

Thank you very much, Keith! You are doing the best job!

[@timothymaxwell8958]

Great! This is a very engaging and informative video.

[@KeithBarker]

Thank you Timothy Maxwell!

[@linslus27]

Thank you for this video. It helped me a lot.

[@KeithBarker]

Of Course! Happy To Help!

[@Brian-cf7dc]

Do we set the bridge ID or is it set automagically?

[@KeithBarker]

Thank you for the question Brian. The bridge ID is done automatically, and is a combination of the priority value and the base MAC address.

[@minuterain]

Keith, would you mind sharing briefly how your lab setup is like?

[@KeithBarker]

Thank you for the question minuterain. I use a combination of physical and virtual gear. For the virtual I have access to CML, Eve-NG, and a few ESXi hosts to run them all.

[@minuterain]

King Keith , thank you kindly for the glimpse into the battle station of the maestro, I had imagine no less given your mighty fortitude and depth command. I have been struggling to decide which part to go down - looks like Esxi is needed if wanting to take it on the next level seriously.

[@raymondjohn1367]

Great way to explain Keith. Would have been done with CCIE I'd I had gotten your channel earlier. Stuff here. I'm on to CCNP but brushing up with this before I enter that. I won't stop till I get CCIE.

[@KeithBarker]

Welcome aboard!

[@memyselfimemyselfi496]

Where can I get a working copy of Wireshark?

[@KeithBarker]

Thank you for the question. Wireshark is free, and can be downloaded here www.wireshark.org/ Thanks for watching! Enjoy the whole playlist here ogit.online/sloth

[@andreslopez180]

Hey Keith, thanks for the video sir. I already pass my ccna but still like to review for sure. Hey question, I’m looking at your video course for CCSA R80 on cbtnuggets, do you have any recommendations for books or any other study plans, thank you in advance sir.

[@KeithBarker]

Thank you Bryan. For the Check Point, I used a lot of there online documentation, and found it very helpful. If you are looking for another book, I have found the Amazon reviews are a good indicator of which ones would work, and which ones to avoid. Hope that is useful, and enjoy your Check Point studies. I like their product.

[@nimesis124]

Very informative. Great effort and Great work.

[@KeithBarker]

Thank you Nimesis!

[@sergnic6998]

I want this T-shirt! 😁

[@johanaleman4370]

These videos are awesome. Quick question. I'm preparing for CCNA. Is your playlist enough to prepare or should I sign up in CBTNuggets?

[@KeithBarker]

The playlist isn't enough. Sign up for CBT Nuggets, watch the videos and do the labs provided. You will have a blast!

[@gideonkipkoech4853]

Liked it. A very good explanation

[@KeithBarker]

Thank you Gideon Kipkoech!

[@knight024]

I know this really isn't on the CCNA/CCNP topics - but if you could go over how trill and spb 802.1aq work :)

[@KeithBarker]

Thank you Michael Taylor, great idea. Working through the CCNA content currently, but will will add that to my list. Glad you are here!

[@Vanillavegan1]

I noticed in Packet Tracer that end stations (PCs) receive STP packets. Is this because the port is a designated port and the switch has no way of determining what type of device is on the other end? Is there a way to turn this off to reduce the waste since the end devices are filtering those STP packets?

[@KeithBarker]

Thank you for the question. Yes, the ports going from the switch to the PCs are designated ports. Good news, to stop the flow of BPDUs to these PCs you can use the feature of "BPDUFilter", which may be applied in global config using this: spanning-tree portfast bpdufilter default .. and will cause any ports using portfast, to no longer send BPDUs out those ports. You can also enable bpdufilter using an interface command of: spanning-tree bpdufilter enable That is the good news. The bad news is that it looks like Cisco did NOT simulate that feature in the current version of Packet Tracer. Hope that helps, and thanks again for the question.

[@samucancld]

Buenísimo loko