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In the previous video, we have created new
topology for room 3.

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Now in this video, we are going to connecting
room 3 with room 1 and room 2.

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Let’s just start.

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Let’s connecting between switch room 2 to
switch room 3.

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Remember that interface between switch should
be configured as trunk.

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So here in the switch room 2, interface fa0/7
will become trunk, and in the switch room 3

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interface fa0/5 will become trunk.

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Let’s start with switch room 2.

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Enable, configure terminal.

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Interface fa0/7, switchport mode trunk.

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Next let’s configure switch room 3.

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Let’s go to interface fa0/5, and then switchport
mode trunk.

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Okay here we get an error “command rejected,
an interface whose trunk encapsulation is

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auto can not be configured to trunk mode”

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So here we failed to configure this interface
become trunk.

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Before we talk about this, let’s talk about
protocol in trunk, actually we have two protocol

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in trunk, which is ISL and 802.1q.

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ISL is cisco proprietary, this is means that
ISL is only used if cisco switch meet with

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cisco switch.

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If cisco switch meet with others vendors,
we can not use ISL.

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But now ISL is no longer used.

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I never see the implementation of ISL.

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But 802.1q is open standard.

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This is means that all vendors can use this
protocol.

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And this is the protocol that we will use
in trunk.

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In the switch 2960, it’s only support 802.1q.
switch 2960 not support ISL.

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So remember that switch 2960 is no longer
support for ISL.

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This is why when we type switchport mode trunk,
there is no error, because the switch only

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support 802.1q.

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But when we configure switchport mode trunk
in switch 3560, we got an error, this is because

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switch 3560 is still support for ISL and 802.1q.

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So before configuring mode trunk, we need
to specify which protocol we want to use.

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Absolutely we want to use 802.1q. because
ISL is no longer used.

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So here before switchport mode trunk, we need
a command to specify the protocol we will use

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the command is switchport trunk encapsulation
dot1q.

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And then here we can type switchport mode trunk.

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Okay we have done.

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Now let’s verify it.

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Do show interface trunk.

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Okay here we can see that now we have interface
trunk, which is fa0/5.

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Let’s also check in the switch room 2.

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Do show interface trunk.

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Okay here we have 2 interface trunk, which
is fa0/5 that connected to switch room 1 and

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fa0/7 that connected to switch room 3.

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Now let’s ping between pc in the same vlan
but different room.

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Let’s start from pc vlan 10 in the room
3 to the pc vlan 10 in the room 2.

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Here we can see that the result is success.

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Now let’s try from pc vlan 10 room 3 to
the pc vlan 10 room 1.

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Okay here we can see that the result is also
success.

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Next let’s try for vlan 20.

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From room 1 vlan 20 to the room 3 vlan 20.

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Okay here the result is success.

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From room 3 to the room2, here the result
is also success.

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Okay so now we have done configuring trunk
in all switch.

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So between pc in the same vlan but different
room can communicate each others.

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I think enough for this video.

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Thankyou for watching and see you on the next
video.