All language subtitles for Free-CCNA-Analyzing-STP-Day-20-Lab-CCNA-200-301-Complete-Course_en

This is a free, complete course for the CCNA.

If you like these videos, please subscribe\n

Also, please like and leave a comment, and\n

Also, remember to download this practice lab\n

out yourself in packet tracer.

If you want more labs like these, I highly\n

the CCNA, click the link in the video description\n

It’s a network simulator like packet tracer,\n

of these guided labs to not only help you\n

but also deepen your understanding of the\nexam topics.

I used it myself when studying for my certifications,\n

Watch until the end of this video for a preview\n

And if you want to get your own copy of NetSim,\n

Okay, in the lab instructions for today’s lab,\n

That’s because, if you can see the link\n

in a forwarding state and which are in a blocking\nstate.

To turn them off, which I already have, click\n

make sure ‘show link lights’ is disabled.

By the way, I assume you’ve already studied\n

lecture video, so this will just be a fairly\nquick walkthrough.

If you have forgotten some concepts, like\n

lecture video again to review before trying\nthis exercise.

So, the first portion of this lab is the same\n

Identify the root bridge, then identify the\n

either root, designated, or non-designated.

But since we’re in Packet Tracer, we can\n

I didn’t want to make the lecture video\n

so please watch this video to see which commands\n

First up, which switch is the root bridge?

First we must compare the bridge priorities,\n

Those are the two components of the spanning\n

bridge ID becomes the root bridge.

In this case the answer is fairly obvious,\n

So, we now know port role of each interface on\n

ports because it is the root bridge.

Just to make things easier to remember, let\nme make labels.

Click on the note button up here, and let\n

Okay, and after you have made them let’s move them into position.

Okay, so all four interfaces on SW3 are designated\nports.

Next up, let’s find the root ports.

Each other switch in the topology must have\na single root port.

The first criteria to determine the root port\n

root cost will become the root port.

Via either F0/1 or F0/2 it would have a cost\n

Via f0/3 or f0/4 it has a cost of just 19.

So, it will be either F0/3 or F0/4, but we\n

tiebreaker, neighbor bridge ID.

Well, both are connected to the same switch,\n

The final tie breaker is the neighbor switch’s\n

It’s important to remember that this isn’t\n

It’s the neighbor switch’s port ID, SW3’s\nport ID.

F0/1 is lower, so that means SW1’s F0/4\n

that label. And then I will move it over to SW1.

Okay next, which will be SW2’s root port?

F0/3 is directly connected to the root bridge, so it might look

via F0/3 it has a root cost of 19.

Via G0/1 it has a root cost of 4, plus 4 for\n

Therefore, G0/1 will be the root port.

That also means we can label SW4’s G0/1\n

to a root port is always designated.

So, SW4’s root port is now obvious, since\n

It also has a very low cost, only 4.

Okay, so we have found and labeled all of\nthe root ports.

Next up, in each remaining collision domain\n

and which will be non-designated.

First up, two very obvious ones.

SW1’s F0/3 is connected to the root bridge,\n

The same goes for SW2’s F0/3, it is connected\n

All that remain are F0/1 and F0/2 on SW1 and\nSW2.

The first criteria is the root cost.

The interfaces on the switch with the lower\n

SW1's root cost is 19, via F0/4.

However SW2’s root cost is 8 via G0/1.

So, SW2 has the lower root cost, therefore\n

The other side, SW1’s F0/1 and F0/2, will\n

Now that we’ve figured out the answers,\n

Let’s go on the root bridge, SW3 first.

So enter privileged exec mode with ENABLE.

And the first command I want to show you is SHOW\nSPANNING-TREE.

At the top here, it shows the VLAN number.

If there were multiple VLANs on these switches,\n

In fact you can filter the output of this\n

But we only have a single VLAN, so it doesn’t\nmatter here.

Under that, spanning tree enabled protocol\nIEEE.

This means we are using the ‘classic’\nspanning tree.

Actually, it’s Cisco’s PVST, but this\n

than the newer rapid spanning tree, which\n

Then there are two big sections, Root ID,\n

tree’s root bridge, and bridge ID, which\n

In this case, SW3 IS the root bridge, so they\n

Under Root ID it just lists the priority of\n

its the priority of 24576 plus the extended\n

In the root ID section it clearly states,\n

Then there are some timers listed, I’ll\n

Finally, at the bottom, each interface participating\n

role, status, cost, interface ID, and interface\n

course by the way, it's not necessary.

So, because this is the root bridge, we expect\n

As you can see, they are, so we were correct.

Now, before moving to another switch, let\n

SHOW SPANNING-TREE DETAIL lists similar information\n

I won’t go through everything here, but\n

And one more command, SHOW SPANNING-TREE SUMMARY.

This lists each VLAN, and shows how many interfaces\n

I told you about Blocking and Forwarding already,\n

are transitional states which I will teach\n

The final column, STP active, just lists how\n

By default, every interface that is connected\n

Next let’s take a look at SW1.

Enter privileged exec mode with ENABLE.

As expected, F0/4 is the root port and is\n

Note that slightly different terminology is\n

Also, notice that the root ID section shows\n

information is different, this is SW1’s\nown information.

So, our answers for SW1 were correct.

Looks like we were correct again.

F0/1 and F0/2, connected to SW1, are both\n

really these connections are disabled because\n

F0/3 is blocking, and G0/1 is the root port.

By the way, something I should have mentioned\n

cost of this interface, not the total root\n

If you want to see the total root cost, use\n

Here it says, cost of root path is 8, because\n

So, G0/1 is designated, and G0/2 is the root\nport.

So, we successfully calculated the spanning\ntree topology.

Next up, let’s take a look at a lab in Boson\nNetSim.

Okay, for today's Boson NetSim for CCNA lab\n

Here in the 'network access' section of NetSim\n

Why is that, why does Boson not include spanning\n

Well, let's check the exam topics list.

These are the exam topics for the CCNA 200-301,\ncurrent version.

2.5, 'describe the need for and basic operations\n

So, 'describe' and 'identify'.

There's no mention of 'configure', like these\nother topics.

'Configure, configure, configure, configure.'

This one, 'describe' and 'identify'.

So, according to the exam topics list, spanning\n

So that's probably why Boson didn't include\n

However I still think it's a good idea to\n

and configuring spanning tree.

So that's why I include labs in my course.

However, if you check out the CCNP ENCOR 350-401\n

3.1c, configure and verify common spanning\ntree protocols.

So configuration is included in the CCNP exam\ntopics list.

So instead of a CCNA, NetSim for CCNA lab,\n

There are quite a few spanning tree labs here.

Starting here, 'Spanning Tree 1', all the\n

The one we're going to take a look at today\n

Click on the lab, and click 'load lab'.

But, I've already done that, so 'lab instructions'.

So there are four switches here, P1ASW1, ASW2,\nP1DSW1, DSW2.

ASW mean 'access switch', 'access layer switch'.

And DSW is 'distribution layer switch'.

These are two common layers of network design,\n

talked about them yet in my course.

So, you can wait for that in the future.

Just know their meaning now, 'access switch',\n

Notice the hosts connect to the access switches,\n

Okay, so just for today's preview I will do\n

On P1DSW1, issue the SHOW SPANNING-TREE VLAN\n

SHOW SPANNING-TREE DETAIL, to display the\n

Use the output to answer the following questions.

So let's go into the CLI of DSW1 here.

Click on the device and click on 'console'.

SHOW SPANNING-TREE VLAN 1 DETAIL.

So, question A, which spanning tree is VLAN\n1 executing?

We aren't actually going to do any configuration\n

And actually that's something I really like\n

to really test your understanding of the topic.

So anyway, which spanning tree?

It says it right here, 'VLAN 1 is executing\n

This means classic spanning tree protocol,\n

This is not rapid spanning tree protocol.

Okay, so that's the answer, regular classic\nspanning tree.

B, what are the priority, sys-id, this is\n

Bridge identifier, bridge ID, has priority\n

to the priority so it's really 24577 in total.

So, that's question B. Why is there no root\nport?

Well let's confirm, is there a root port?

Here, fastethernet0/1 is designated forwarding,\n

0/2 designated, 0/3 designated, designated,\n

So there are in fact no root ports.

We are the root of the spanning tree.

This switch is the root bridge.

As you know, every port, every interface on\n

So that's why there are no root ports.

So that's C. And then D, why are there no\n

Well that's the same reason, because it's\nthe root.

There will be no blocked ports on the root\n

Okay, E, what is the timer value for sending\n

So, I haven't talked about the timers yet\n

them in the next lecture video, Day 21.

Hello time is the interval at which it sends\n

So 2 means 'every 2 seconds'.

So it will send 1 BPDU every 2 seconds.

What is the maximum age for a BPDU?

Again, I will talk about this, this maximum\n

And what is the value of the forward delay\ntimer?

Okay, so that's the answer for G. Okay, so\n

then lab solutions highlighting all of the\n

So there it is, Boson NetSim.

If you want to get a copy of Boson NetSim\n

at all of these guided labs they have here\n

From network fundamentals, network access,\n

So if you can I highly recommend getting a\n

If you want a copy, please follow the link\n

Please subscribe to the channel, like the\n

with anyone else studying for the CCNA.

If you want to leave a tip, check the links\nin the description.

I'm also a Brave verified publisher and accept\n