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All right, it is time to jump into the lab and do some configurations.

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We're going to focus on the macros, the timer configurations, and well, the

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macros that allow

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us to do the timer configurations.

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And then we're also given a topology with five switches.

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So take a moment to maybe look at the topology, figure out which ports you

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would expect to

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be blocked based on MAC addresses, switch three should be the root when we

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first fire

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this up.

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And from there, maybe throw a priority statement or two on using the macro
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And from there, maybe throw a priority statement or two on using the macro

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statement to change

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the root when we're done to make sure that we know which link would be blocked

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based

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on our calculations.

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So either way, it's good practice, but let's go ahead and accomplish this lab

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challenge.

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First step here is using only root macros to configure switch one to be the

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root and switch

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through to be the backup, switch to to be the backup.

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Now switch three again, we said that we'd expect this to be the root and we're

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supposed

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to use VLAN 10 for all of this.

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I'm going to say VLAN 10 root.

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And indeed, the lack of root port says that switch three is the root.
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And indeed, the lack of root port says that switch three is the root.

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And again, I'm going to switch one here and use that macro spanning tree VLAN

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10 rather

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than priority, I'm going to say root primary.

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And then when I do that show spanning tree VLAN 10 root command.

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So I am the root, but also notice the value that was chosen is 24 K. And so

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that's what

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we'd expect based on everything we've talked about.

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Switch to I'm going to run that secondary command spanning tree VLAN 10 root
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Switch to I'm going to run that secondary command spanning tree VLAN 10 root

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secondary.

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And then if I do show spanning tree for VLAN 10, I'll see all the information

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for my own

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bridge ID, including my priority of 28 K, which is exactly what the secondary

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is going

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to do.

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Next using only root macros configure.

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Oh, that's what we just did.

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All right, determine the diameter of the network and adjust the timers.

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So with the network looks like this, where we have four switches in a square
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So with the network looks like this, where we have four switches in a square

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and another

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switch down here.

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So what is the diameter here for the most part outside of rather unique

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situations, the number

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of switches is typically going to be our diameter for the smaller lab type of

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scenarios.

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And a production network will have to do a little bit more work.

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The idea here is to eliminate redundant connections where we need to, in fact,

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I could just erase

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these like that.

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And that allows us to see what this network looks like if some of these links
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And that allows us to see what this network looks like if some of these links

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are down.

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So we see starting from one of the edge switches here, one, two, three, four,

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five.

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And remember, we do include the first switch that we start counting from.

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So this is a diameter of five.

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And so we want to go ahead and configure timers that are appropriate.

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So what we want to do is get onto the root here.

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We can go ahead and do it from here.

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And I say spanning tree VLAN 10.

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And it's the same macro.

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We were just going to add more parameters.
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We were just going to add more parameters.

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I'm going to say root primary.

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And we're on a question mark.

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We see diameters and options.

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So I'll say five here.

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And then I also need to know what my hello timer is going to be.

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So I can go ahead and type in hello time.

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And then the lab task said to base it on one second.

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So I'm going to say one second.

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And then when I do a show spanning tree, VLAN 10, I'm going to see that my

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hello timer

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was set to one second based on that command and then max age and four delay are
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was set to one second based on that command and then max age and four delay are

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pretty

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low.

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They go a lot smaller when we're using one second to lows, which that's a big

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driving

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factor.

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So the parameter five is a little bit less than the default diameter of seven.

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So that's lab task two lab tasks three without using macros and sure the backup

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route will

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use the same timer values if it takes over as the roots.

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So basically what we're saying here is let's use the real timer commands.

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And we want to match one 10 and seven.

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So I'm going to come over to switch to and say spanning tree VLAN 10.
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So I'm going to come over to switch to and say spanning tree VLAN 10.

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We see the different options here.

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So I'm going to start with hello time of one second, then spanning tree VLAN 10

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forward

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time was was it 10 seconds for max age?

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Yeah, and seven for four.

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So seven for forward.

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And then max age is 10.

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So there we go.

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That's test number three.

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And so that's pretty much it.

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Now we do have this bonus challenge, which is using only root macros adjust

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switch one

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to use a priority of eight K.
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to use a priority of eight K.

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So here's the idea.

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If we're only going to use root macros, I can't specify a priority, but I do

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recall that every

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time let's say switch three, we know switch three is better than switch one.

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If I were to adjust this to say, Hey, I want you to be the root and I'm going

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to use the

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root primary, well, it's going to match what route what switch one is.

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So switch one right now is 24 K. So then I would use this set switch three to

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be 24 K.
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be 24 K.

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And then that's going to make switch three the route.

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Then I come back here to switch one and use the same command and it will go to

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20 K to

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beat switch three.

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If I alternate back and forth, eventually I will get down and it will take a

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while.

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It will get down to the target value.

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What do we say?

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We said eight K probably shouldn't have gone that low, but either way we will

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eventually

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get there.

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We see we need to do it four times on each one.

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So we don't have to do this the whole time, but let's just do a few times.
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So we don't have to do this the whole time, but let's just do a few times.

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So if I say spanning tree VLAN 10 root primary on switch three, now I can do my

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root command.

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See I am the root and my priorities 24 K. And then if I do the same command

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here, spanning

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tree VLAN 10 root primary spanning tree VLAN show spanning tree VLAN 10 root,
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tree VLAN 10 root primary spanning tree VLAN show spanning tree VLAN 10 root,

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we see that

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now I am 20 K. So if I come back to switch three and say let's do this again, I

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'm going

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to run the same macro.

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Now I'm at 20 K switch one same command.

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Now I'm at 16 K and so on and so forth.

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So this is just a little exercise.

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So that should be at 16.

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Oops.

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Now that should be at 12.
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Now that should be at 12.

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I guess we will go ahead and do it the whole time.

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Now this should be at 12.

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Now we should be at eight.

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So let's go ahead and run this command.

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And indeed we landed at the eight K value.

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So again, the fact that we were restricted to just using the macro says that we

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really

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in order to do this bonus task, we really needed to understand what the macros

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are doing.

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And then how to manipulate them to get us exactly what we were looking for.

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Probably nothing we're ever going to do in production, but a little fun

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exercise that

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again really emphasizes how these macros actually function.

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I hope this has been informative for you and I'd like to thank you for viewing.
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I hope this has been informative for you and I'd like to thank you for viewing.