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In this video, we are going to
learn about inter vlan routing,

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which is how we can connecting
between pc in the different VLAN.

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So all pc in all vlan should be
able to communicate each others.

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To connecting between vlan like this, we will
need a router. So here let’s import a router,

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go to network devices, and then
here let’s import router 2811.

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Here we only need 1 router and we only need
to connecting this router to 1 switch.

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We are free to connecting this router to any switch, we
can connecting the router to switch 1, switch 2,

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or switch3. In this case I want to
connecting the router to switch 1.

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Now let’s talk about the
address. In the previous video,

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I have said that different vlan must be using
different network or different block subnet.

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But here we still configure all vlan with
same block subnet, which is 192.168.1.x.

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From now, we are going to use
different network for each vlan.

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For example, for vlan 10, we are
going to use 192.168.10.0/24,

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for vlan 20 we are going to use
192.168.20.0/24, and for vlan 30 we are

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going to use 192.168.30.0/24. Okay, this is the
ip address that we are going to use for each vlan

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Next, you need to remember that if pc want
to communicate with other pc in the different network,

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the pc will need a gateway. Here
let’s go to the pc, dekstop, ip configuration,

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and here we can see default gateway.
Once again, remember that if pc want

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to communicate with others pc in the different
network, so the pc will need a default gateway.

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But if pc want to communicate
with other pc in the same network,

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the pc will not need default gateway.
For example here if pc in the vlan 10

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want to communicate with others pc in the
vlan 10, so the pc not need default gateway.

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But if pc in the vlan 10 want to communicate with
pc in the vlan 20, so the pc will need a gateway.

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And who Is the gateway? The
gateway will be the router.

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So here we need to configure an ip address
in the router to become gateway for all pc.

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Okay let’s just start. Open the router,

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go to CLI , here choose no, enable, and
then go to global configuration mode.

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Next, here we can see that the light of
interface fa0/0 is still red, this is means

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that the interface is still disable, let’s enable
this. Interface fa0/0, and then no shutdown.

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Okay here we can see that now
the light is already green.

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Next let’s configure the ip address in
the router to become gateway for all pc.

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Let’s configure for vlan 1 first. For vlan
1, we will configure the ip address in fa0/0.

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Here we already in fa0/0, so ip
address 192.168.1.1 255.255.255.0.

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Okay now we have done configuring the
ip address in the router for vlan 1.

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Next let’s configure the ip address for vlan 10.
For vlan 10, we will need to create sub interface.

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So here let’s go to interface fa0/0.10. fa0/0
is the interface of router that connected to the switch,

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and 10 means that we are going to
create sub interface 10. This will be for vlan 10

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Next let’s type encapsulation dot1q 10.
This command is to define that interface

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fa0/0.10 is for vlan 10.

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Next let’s configure the ip address.

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The ip address of vlan 10 is 192.168.10.1
and the subnetmask is 255.255.255.0.

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Okay we have done for vlan 1 and vlan 10, next
let’s configure for vlan 20. Let’s create sub

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interface for vlan 20, so interface fa0/0.20,
encapsulation dot1q 20. Remember that this command

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is to define that interface fa0/0.20 is for vlan
20. And finally let’s configure the ip address.

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The ip address for vlan 20 is 192.168.20.1
and the subnetmask is 255.255.255.0

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Okay, last let’s configure the ip address for vlan
30. Interface fa0/0.30, encapsulation dot1q 30

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and then ip address 192.168.30.1 255.255.255.0.
Okay now we have done configuring the ip address

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of router for all vlan. To verify, we can
use command do show ip interface brief.

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Here we can see that we already have
ip address for vlan 1, 10, 20 and 30.

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Next, we need to configure trunk in the
switch interface that connected to the router.

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In this case the interface is fa0/8. Why
this interface should configured as trunk?

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This is because when different vlan
want to communicate each others,

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the communication will go through the router.
For example vlan 10 want to communicate with

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vlan 20, so the packet from vlan
10 will be sent to the switch,

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from switch to the router, from the router
back to the switch and finally go to vlan 20.

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This is why we need to configure fa0/8

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as trunk. So this interface will
able to pass packet from any vlan.

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Okay let’s configure it.

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Enable,

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configure terminal. Go to interface
fa0/8, and then switchport mode trunk.

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Let’s verify it, do show interface trunk. Okay
here we can see that now we have 2 trunk,

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which is the interface that connected to the router,
and the interface that connected to the switch 2.

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Okay now we have done configuring inter
vlan routing, now all vlan should be able

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to communicate each others. We are going
to doing a testing in the next video.

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So thankyou for watching and
see you on the next video