Original subtitles

He's spending pretty important in Ethernet networks.

Why is that important.

What happens when you disable spanning tree.

I you crazy.

So to help answer those questions I've got a package to trace a network consisting of two pieces.

P.S. 1 and P.S. 2 which are connected to layered two switches these switches are running a default configuration

and as you can see in Packet Tracer this interface is blocking.

So in other words spending tree is blocking on this port.

We can see that by looking after the C a lie over the switch.

So show spanning tree shows us that gigabit 1 02 has an alternate roll in spending tree under the current

status is blocking.

That means that for example pings from P.S. want to P.S. two will be sent across this link gigabit 1

0 1 and not across gigabit.

1 0 2.

BPT use or bridge protocol data units and some other management traffic will be sent and received on

this port such as Cisco Discovery Protocol and Link Layer Discovery Protocol or CTP and a little DP

but user traffic will not be received or transmitted under this port.

So what happens if you disable spanning tree on both of these switches.

What will happen to the network

now before I continue let me warn you.

You use this packet tracer lab at your own risk if you disable spanning tree switches as I'm going to

do in this video your piece CB you could go to 100 percent packet tracer could crash and other nasty

things could happen.

So if you follow what I'm going to do here the risk is entirely yours.

So what do you think's going to happen when we disable spanning tree on both of these switches.

How will traffic flow.

So as an example of P.S. One sends a ping to P.C. to how will packets traverse the network.

What will happen to help demonstrate that you can use simulation mode in Packet Tracer.

And for this example I'm only going to look at OP and ICMP traffic.

If you want to try this yourself or download the packet to trace a file and use simulation mode in Packet

Tracer but again doing what I'm going to do here.

Done at your own risk.

I'm not going to demonstrate what happens when spending Tre is disabled on both of these switches and

show you how packets flow in the network.