At the moment in this typology switch to the root.
And we can prove that by using show spending tree and notice the local switches the route for the land
one in the typology No the villains are being enabled so the only eaten at Villani existing at the moment
is villaine one and all portside villaine one on all the switches.
When looking at the BPT use we can see that the switch is advertising a route part cost of zero and
the bridge ID and router identifier are the same on switch one when we capture traffic here.
It's advertising a route path cost of four and you can see that the bridge identify is different to
the route identifier.
So on switch one let's change the spanning tree villaine one route.
So change the switch to become the route.
And in this case it will be the primary route that will drop the priority of the switch.
Previously the switch was using a default priority which we can see in the Why Shock capture.
It was 3 2 7 6 8 plus the villain number that now shows spending three shows us that the switch priority
has been reduced to a value lower than any current route to bridge.
So the switch has now become the route of the spending tree topology bridge MAC address and route MAC
addresses the same.
So there's our first wide shot capture.
And if I scroll down to the latest advertisements notice the route part cost is 0.
Preach ID and root identifier are the same.
The properties have been reduced so this switch is the route with a lower priority.
You can see that the bridge proteins 2 4 5 7 6 extended system IDs one because this is veel and 1 and
the MAC address of the switch is set to the following.
So once again if you look through the y shall capture the capture 114 at the moment previously the route
identifier and bridge identify would different.
Now what about switch to previously the switch was the route.
So notice on capture one the switch previously had a route path cost of 0.
But scrolling down to the captures you can now see that it has a route path Costa for it's a local bridge
identifier has a higher priority.
So the switch is no longer the spanning tree route.
Previously on switch three this was the route port.
So he has the output you can see that gigabit 0 0 was the route port on switch 3.
What is it now.
So show spanning tree notice gigabit 0 1 is the route port at the moment.
So previously on switch 3 this was the route port but the route port has now changed to this port because
the switches.
Now the spending tree route the path cost using this link is four ways now the path cost using this
link would be for plus fall.
In other words 8 to get to the root bridge
spanning tree typologies can done chemically change.
So as an example if on switch three are shut down gigabit to 0 1 and top to show spending tree what
we can see now is that gigabit is 0 0 is now the root port as this port is no longer available.
If I know shut that interface
and talk shows spending tree can see the interfaces Coming up what you can see now is that gigabit 0
1 has become the root port once again whereas this port is now blocking to stop a spanning tree loop.