CCNP ENCOR // Spanning Tree Protocol (STP) Algorithm // ENCOR 350-401 Complete Course

[@xinyin1850]

The lecture is high-quality , precisely clear, straight forward to the point. It saves me from being confused when only reading the CCNP textbook again and again. The best tutor for CCNA and CCNP.

[@rawadelhachem1346]

I never thought i would be excited to study something before ur content is gold 🥇

[@Hypocrisy.Allergic]

the goat is back, please post more often, it is the only content on youtube i look forward to

[@pastelek3]

GOAT is back 🐐

[@khurramaziz2430]

Hi Jeremy ! Awesome content as always 5:35 => Please confirm for *Root port selection:* • Lowest root cost • Lowest neighbor BID • Lowest neighbor port ID • Lowest local port ID or • Lowest neighbour port ID

[@TexasGardenerd]

@23:38 Shouldn't the Root port for SW1 be G0/1, because the neighbor port id on SW3 is g0/0 which is a lower port id than sw3g0/1.

[@jaysejpal1039]

The root port on SW1 is correct because it would receive BPDU from SW3 (using either G0/0 or G0/1) with the same neighbor port ID (The hub broadcasts the frame out of all interface except the incoming). So neighbor port ID becomes a tie and the SW1 has to use the lowest local port ID to select as a root port which is G0/0

[@Wetheuntitled]

I just took and passed my CCNA thank you so much jeremy 🎉🎉🎉

[@stefanraresradu2309]

Hubs are devices that operate at 10/100 Mbps, which means that when a switchport connects to a hub it will have a speed of 10/100 (depending on the hub) => bandwidth value of 10/100 which means an STP cost of 19 instead of 4. So, in the first topology for instance, SW1s cost on G0/0 and G0/1 would be 19

[@JeremysITLab]

1-gig hubs are rare, but they do exist! I have a Japanese one that I use for labs occasionally

[@stefanraresradu2309]

​@@JeremysITLab Well, it's Japan so, anything is possible :)

[@JeremysITLab]

@@stefanraresradu2309 Yet they still use fax machines and other ancient technology!

[@muhammadhusnain3724]

i think the blocking port should be at non root bridge at 5:36

[@gwojcieszczuk]

At 25:06, there's mistake on SW1 in selection of Root Port. Gi0/1 (SW1) should be Root port, because "lowest neighbor port ID". I built this in eveng to verify. SW1: gi0/0(ALT-BLK), gi0/1(Root,FWD). SW3: gi0/0 (Desg,FWD), gi0/1(Desg,FWD).

[@JeremysITLab]

Are you sure you connected them to a hub? The topology you just described is a layer-2 loop: both of SW3's ports are forwarding, even though they're connected to the same hub. I just tested on physical Cisco switches, and the topology in this video is correct.

[@gwojcieszczuk]

@@JeremysITLab You're correct. Apologizes. I completely missed that bridge between SW1 and SW3. In Eveng, i can't really use Hub, but it seems un-managed bridge does the trick, with the benefit of having full duplex instead of half-duplex.

[@anfsec]

love it!!

[@ouroboroCat]

On the question, i don't see the root cost for the ports listed anywhere? Why is G0/0 on SW1 the root port? Without seeing any root costs displayed, it would seem like F0/3 on SW1 would be the root port because it's only one layer 2 hop away and not across a hub! Please reply because this is not making any sense!!

[@bytegga8623]

I think its because F0/3 is a fast ethernet connection, so its cost is 19. Versus G0/0 on Sw1, which when added to the root cost of Sw3 and Sw4 is 12 (Sw1 root cost + Sw3 root cost + Sw4 root cost). So it becomes the root port because it has the lowest cost + lowest port number

[@ryanadauto3705]

Yes, im on the same, i think f0/3 is the Root, if jeremy would explain the root cost for each interface of sw1 would be superclear

[@scipio1010]

@@ryanadauto3705 I noticed this inconsistency too and I was looking for an explanation. I think bytegga8623 is right. On the diagram SW01 - F0/3 ...... "F" stands for FastEthernet which is 100Mbps (cost 19) while always on SW01 - G0/0 ........ "G" stands for GigaEthernet which is 1000Mbps (cost 4).

[@moulay.elmustaphatahir]

Thank you very much Jeremy

[@QuantomMindfulness]

Jeremy, for the quiz question, for SW1 wouldn't the root port be G0/1 since its neighbor port is lower? If not, then SW1 wouldn't be receiving any traffic right? Please help, and thank you.

[@ahmedazzouz4584]

Its neighbor port is actually 2 ports both SW3's G0/0 and G0/1 combined, same thing with SW1 G0/1, why? Because the hub is a single collision domain that floods the frame on all its ports From SW1G0/1 towards SW1G0/0(a loop-ish* behavior) and the neighboring SW3 G0/1 and G0/0*. Therefore the **local** port with the lowest ID is selected which is G0/0 in default settings.

[@jrabano8688]

Thanks Jeremy. Your videos make me learn this each topic clearly. Please complete series ASAP so I can get my CCNP ASAP. j/k but hurry up please, waited 7 months for this.

[@cybersecurity324]

Loved this video! I have a question; What is exactly a PORT ID?, I think it's different from the Port Number we see in Lab, isn't it. Thank you in advance.

[@mustafarasool7591]

Hello jeremy , could u tell me please what type of labs you faced when u passed the encore exam ?

[@NetTechies11]

netflow (simple lab), SPAN, EEM applet

[@ryanadauto3705]

Jeremy can you please explain how did you set the root costs of the SW ? it's a bit tricky . Hope you can help :D

[@alistar4551]

when did this course finished

[@yeayea8334]

Hi Jeremy, did you write a book? I received an email about that great news, but the link has expired. So I started searching the book on Google and I found the title, Acing the CCNA exam, but I don’t understand if it’s an ebook or a printed book

[@JoseAugustoEncarnacion-h4l]

I wish you would have explain Root Path Cost more and how they accumulate with these lessons. It would have save me from a lot of confusion or maybe im just an idiot .

[@JeremysITLab]

11:06

[@JoseAugustoEncarnacion-h4l]

@@JeremysITLab thanks Jeremy you are tremendous help .I have adhd and miss these small details from time to time.

[@michaelbeukes4807]

is it fine to use the config like this spanning-tree mode rapid-pvst spanning-tree extend system-id no spanning-tree vlan 121-122,197-199,400-499,501-503,505-516,518-533,535-538 no spanning-tree vlan 540-541,544-559,561-573,575,577-581,584-585,587,589-591 no spanning-tree vlan 594-619,621-731,733-738,740-797,799-899 spanning-tree vlan 58,121,196,211-212,500,504,534,539,542-543 priority 24576 spanning-tree vlan 574,576,582-583,586,592-593,798 priority 24576 or should I completely remove these "no spanning tree" and "spanning tree" and just run RPVST on all VLANS?

[@dustcore]

👍🏾 👌🏾 👍🏾

[@muhammadhusnain3724]

i think if we learn you CCNA we will more clear that things what you say ?

[@faheemmirkar658]

Hey Jeremy Please complete this series ASAP Waiting from long time

[@boros123]

Hey Jeremy, please make a video on LISP soon.