CCNP ENCOR // Spanning Tree Protocol (STP) Algorithm // ENCOR 350-401 Complete Course
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- เผยแพร่เมื่อ 6 ส.ค. 2024
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This video covers the algorithm Spanning Tree Protocol (STP) uses to decide port roles and prevent layer 2 loops.
In this FREE and COMPLETE course for CCNP ENCOR 350-401, you will find lecture videos covering all topics in the Cisco official exam topics list, end-of-video quizzes to test your knowledge, flashcards to review, and practice labs to get hands-on experience. All you need in a single course, for free!
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0:00 Introduction
0:37 Things we'll cover
1:04 The need for STP
2:16 What does STP do?
3:40 The STP Algorithm
5:36 Root Bridge election
10:17 Root Port selection
13:37 Root Port selection: root cost
15:01 Root Port selection: lowest neighbor BID
15:53 Root Port selection: lowest neighbor port ID
17:47 Root Port selection: lowest local port ID
19:17 Designated Port selection
20:38 Designated Port selection: lowest root cost
21:51 Designated Port selection: lowest BID
22:32 Things we covered
23:02 Quiz
25:09 Thank you to supporters
#ccnp #encor - วิทยาศาสตร์และเทคโนโลยี
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.
I never thought i would be excited to study something before ur content is gold 🥇
GOAT is back 🐐
the goat is back, please post more often, it is the only content on youtube i look forward to
Thank you very much Jeremy
I just took and passed my CCNA thank you so much jeremy 🎉🎉🎉
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.
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
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
1-gig hubs are rare, but they do exist! I have a Japanese one that I use for labs occasionally
@@JeremysITLab Well, it's Japan so, anything is possible :)
@@stefanraresradu2309 Yet they still use fax machines and other ancient technology!
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.
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
Hello jeremy , could u tell me please what type of labs you faced when u passed the encore exam ?
netflow (simple lab), SPAN, EEM applet
👍🏾 👌🏾 👍🏾
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
when did this course finished
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 .
11:06
@@JeremysITLab thanks Jeremy you are tremendous help .I have adhd and miss these small details from time to time.
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!!
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
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
sorry to bother you but how far did u come with this course? is it in the mid or somewhere in the end or still in beginning ?
I would say this is just the beginning
CCNA was nearly 120 videos, id assume this will be longer
Hey Jeremy Please complete this series ASAP
Waiting from long time
Hey Jeremy, please make a video on LISP soon.
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?
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).
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.
@@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.