Original subtitles

Intersection we are not talking about local or in app or redundancy.

And we'll talk about spending three protocols in the first chapter take taken over we look to the spanning

tree in the second day and on talk about spending three types in touch up there.

We'll talk about the configuration of spending three and in the future.

We are going to talk about first up redundancy protocols.

And let's go with this painting.

Tree the first line is talking about why it's penny tree.

Either that frames don't have a TTL value so they can move between switches eternally because of that

you can't face with broadcast storms.

For example let's say that PC Awam sends broadcast

to our network because if that's a broadcast pickup artist which takes the packet and flew it from its

all ports or if it comes to the switch to switch to also takes the pickup and flew it from here.

And so which three also takes the spika.

And because of that broken packet.

This is going to flip is also and other food bill become also on that way.

And as you can see that meeting face with the broadcast tones to people is it like that because internet

friends don't have time to leave.

But the the other thing that we need spending three.

The other answer to this question is we confess with the unicast topic that frames for example PC I'm

trying to send the frame to PC to

switch one knows that PC one is on its fast internet Zoravar import but so the phone has no idea about

PC because of that.

So each one will flip the traffic out from its other parts the traffic going that way and it will go

in this Balzer after pickup loop frame will come to the Sims 2 and switch to us so we will send the

packet to switch 3 and it will send the packet to Pewsey too.

But from here we have to send for him to come in to see his.

So we also sent this packet for him to his to.

So we are going to face that unicast the liquid frames on the switch.

I'm sorry PC to so but spending three per pupil is that building a logical loop free topology for Internet

that works by blocking some of porch swing through protocol ellos that are designed to include redundant

links to provide automatic backup paths if an active links fails also.

Listening up we are sending a broadcast again from PC via 3G one takes the traffic and follows it from

this park and also is going to be a fluke from this book.

But because of this port is blocked by having three different the traffic will not pass through this

way and it wont go to the switch three from this May.

So all in the green traffic will come to the switch three and will effect the PC to

we are two year olds three patrols in spanning three.

The first one is the route ports closest port to the route which is reports but please pay attention

to that closest to the bridge in terms of pepped cause the road bridge which I'm going to tell you about

this.

What is Pepperpot.

And we have also designate ports which mean the boats that are going to have to forwarding the traffic

and we have none designated port which means a blocked port.

As you can see that in here first it turns one is blocked.

So that role is not needed.

Presence there at 0 2 3 and 4

are designated ports which continue the forward terrific and

these are the reports because if they are close to the root page in terms of cost but you.

So let's take a look to how we can elect the proper age to elect the root bridge into that work.

We need to define the law was bridge idea to find the bridge idea we are using prewar level you and

Matt and they're using an system id to support them for STPI.

But in most cases we are not going to use these you calculate the Berjaya.

Please keep in mind that before proceeding through volume for sewage is the swan and Brits use spatial

data friends called BPT you to exchange information about bridge IDs and repair costs.

So let's take a look at this example and let's try to determine the road bridge.

The first thing we need to check is priority value as you can see that in the figure priority values

are same for suites.

So second thing to check is Mekka address because if we need to find the lowest bridge ID we need to

find the lowest make up address this image which has the lowest make up this will be our route in scenario.

If you check here

this nigga address is 0 0 1 7 0 0 2 4 which is bigger.

So I estimate that this this is beginning meet with first and I mean this also and this is beginning

mid 0 0 1.

This is 7 but this is a day is coming after 9:00 at the hexadecimal format.

So I'm eliminating this and because of this which has the lowest McCullough's it's the bridge.

So now let's take a look to the spanning three parts are spanning three path cars spanning three.

Cost value is inversely proportional to the Associated benefit of the path and therefore pepped with

a low cost value is more preferrable than a path with a high cost value as you can determine from this

chart to hauliers

leaks with shows us a lower cost but the K as you can see in the picture in SATB I'm taking a ten g

per second blink as a cost will be of one.

And I'm taking a one year goal so it costs a little fun but I'm taking a 10 minute per second which

is a slower path has a higher cost really as you can see that we have a reverse logic in here.

So if you check the pet one the cost of pet run is according to the reverse I believe specifications.

These rollies were way ribeyes Soviero except this one now.

So let's take a look to the cost of pets one pet one has to first it's in the links

so it's best value.

It's cost well who is Manti.

Let's go to the Ped.

Do we have to face the do links together and we have another face to visit links together.

Which means we are of course full of 19:4 Bob and the whole coast valley of path too is sorted.

So pet one is pretty per hour path to.

So we have a question in here which is which is the roots and remind the Paul groves.

The question is saying that because of the priorities are same

I need to check the last make up of this

and lowest Mickolus is on switch 3 0 0 Well Mom

it's 0 or but the top thing is three in here which is the lowest.

And that shows us this is our

Ruperts

as I told you that 33 is the lowest which most make out low.

I couldn't speak so which three is the bridge because it has the lowest neck and priorities equal analysts

they look to the portraits.

This is my Ruperts

the closest port to the rude bridge from a pet costs.

Valid point of view will be the report for each search.

For example let's check each one here.

We have a fast internet pet to get here which means my cost is just like but if I want to get from this

way I need to pass first Shigo a geological survey and June of last week.

Which means higher costs for me.

And this is the root port for each one and force of for here.

This is the report and so it's true.

This is the box because this is a Jigar and Gigia and Fest's way but here this is a genuine first rate.

But this path is first and Festac.

So Jika is Prester.

So this is our road for

OKB didn't mind our reports.

Please keep in mind that for each segment I should have a designated port.

And please keep in mind this to my look breeds port ports are always in the designate mark.

So I'm going to my sewage and writing the poor girls as designate OK

that's mine.

Well and what I told you is for each segment for each leg.

BITTMAN Swades Mishal Hello designate the port so because of this is Ruport in here.

This is going to be the designated to a here is look at it.

Now we just need that through mine.

This toolbox now I'm comparing switch one and switch to I'm going to choose one of these ports as designated.

And one of these ports will be Nahm designator which means Blug port Jules Verne I'm going to blog.

I'm comparing these two devices priority and I see that they are saying and secondly I'm comparing their

mac addresses the lowest Mikka address will not be blocked as you can see in the picture.

So which one has lower MAC address because of that First-Lieutenant 0 2 or so each one will be designated

for an this part of the switch to 0 2 will be non designator and block.

Let's take a look at Spain three types.

We have.

We have POAD billion spending three rated spending three rapid turbulence Benni tree and MSCP when me

take a look at the difference when the

for S2P 3 calculation is meant for all freelance but four per meal and spanning three three calculation

is made by is made for Per and MSCP is all of our CCMA exams called solar cycle to the previous the

period.

These are Cisco propria pretty technology.

And that creates separate spanning tree for each wheeler and campaign for them.

BLOCK balancing for example this port of this image can be a forwarding port for Reno man but Temby

is blocking for port for we land to as you see that I'm calculating instances separately for each meal.

And let's take a look to the red per and spending three protocol which brought significantly faster

spank through the convergence of threat topology change four days previous D-plus using edge ports and

willing types and PTSD create separate spring free for each villain and can perform a lot balancing

and we have some different states and poor roles for STPI and rapid spin to put the code.

We're just discovering learning and forwarding States for R.S.V.P..

But we have same old blocking listening learning and forward States for STPI so portals are a route

designated them blocked for as the B but Aristippus we have room designated alternate backup and disable

portables or

and let's take a look to the Reppert previous.

The plus edge ports switch ports that are not connected with a switch are edge ports as you can see

in the figure this sewage port is connected to and others which this switchboard also connected to another

switch.

But here on here on Connect the Pacific they are just connect to the PC.

So if there is a change in topology this ports immediately translates to forwarding state and so that

provides us air plus agents exports don't generate topology chance.

Wendling Tagus we should spend three part as to define the export configuration Mihir link types R.S.V.P.

coal's the collection in two or most of it as a link type connection a port that operates in through

the place much is assumed to be point to point link where yes hotplates port through hop is considered

a shared part by default.

As you can see that if I'm talking about the link between two Swiss it's linked by P2P

if I'm directly connected to a PC from a switchboard it's linked to P2P edge and if I can connect to

this PC or the hub that means lead pipe share and let's take a look to this spanning three configuration

now.

Please keep in mind that the default spending three month is PV as the plus for the Ciscos of its an

we can't force to a savage to be our group bridge also as you as we talked in the previous slide we

truly let the rude bridge called topology and let's say the switch to is the wood bridge for the center.

Other than Coklat and it will take off.

I just I'm just assuming Rainer let's say it's 3 2 is the root bridge.

But if I want to force each one to be Rooper H I can use the spelling three Villon one root primary

comment.

If I use this comment so which one takes the action and tells the network that hey guys I'm your new

Roop bridge and Smoochy.

So which two is who.

Goodbye.

I can also lower the priority of the Sichuan to make it look Pritch as you can see the line and I can

also choose a secondary route bridge and the primary route preach Frails.

My second bridge becomes route immediately.

Clarified the route bridge configuration I'm using Scholl's painting tree will and villain number man.

Then I issue this on and I see that this bridge is the route that the commander put.

That means that our route bridge configuration is OK and this bridge this bridge is the route bridge

and let's take a look at the port first configuration

as you know that on the airport we could configure port fast and to configure a pulse port fast before

getting into the interface more and just typing spelling three port fast and BPT you are putting the

interface into Arab disabled state.

If a BPU is received on first Internet 0 7 I'm so I can also set to be were enabled by typing spending

three Lippitt Ugur enable comment

if I want to use Rapide previous D-plus type of SCDP my configuration will be spending three more rapid

PBS.

The

and we the spanning tree.

And let's take a look to the first half.

Redundancy protocols which are designed to protect the default that they use going to subnetwork by

allowing two or more others to provide backup for that address.

We have three protocols that's providing this to us.

They are just happy mirror r.p.m. JVP the European jail BP are all those the scope with the new CCMA

update so we are not it.

These proposals will just take a look to the happy hot standby rather particle physicists will propria

three per the code.

We have a virtual IP and mac addresses and they shit that mean to us there is another load balancing

in this protocol.

And he gave me the final confirmation by using shows them by Colinet for example.

If I want to configure IP to protect my DFA as you can see that I'm setting the set up one is my good

way and I'm setting this in the face of this rather tend up to and setting the turned up three to this

in the face of disruption and I'm setting you a step by IP for these routers and others are sharing

these IP and these are peace tender where they are if they handle these IP and takes the traffic that

are destined to site of this you are definitely Frails then by GET THE goes that the operation rather

with the highest IP address becomes active by default.

But that election can be modified to be it just not be a priority while the highest priority becomes

active.

Please keep in mind that the default priority for HAARP is 100 and two and standby routers exchange

help pickets each 3 seconds

and also it's a separate preemption term.

If my active gateway fails this standby router becomes active and still continue to be active even if

active router comes back.

If I use preemption

and if the standby rather becomes active because of the active rather fails and when that if get they

comes back and if I'm using preemption activated they will handle that process.

Preemption will force us to add new age us Sarpy election process and they will renew the process again

and will be active again.

And we have the stats of the IP and their initial learn lissom Sprigg standby and the active and here

is the configuration of DHS R P for example for other awam.

This is Rodewald.

We have an IP address hoarded up to which is the IP address of the Teague's 00 interface of the rather

WA

and we have a standby IP thirded up WAHM which is being shared by two others.

And you can also and I'm giving the high priority to this rather and making this active forcing this

to be active and I'm configuring preemption and let's take a look to the rather to for the geek 00 interface.

I'm configuring this is going to be Paudie thirty three.

This is the interface of each 00 of rather two and I'm defining the same standby IP address with rather

wan So the gig for the PC is 10 to one which is the standby IP address and these IP address and the

packet sent thing sent to the Ziba others are handled by the activity so that the traffic is flowing

in that way.

Now if rather one Thrale's if there is a problem it rather run rather too informs it and takes the traffic

on itself.

So traffic flows from rather two and we don't have any interruption and all the other one comes back

to work after a while.

Rather one becomes a thief again because Milham we have preemption configure

and 12:5 HRP we are using show Stanback command and we can see the state of the other and if it's active

or standby.