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In a separate Nugget, we
discussed the concepts

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of an 802.1Q ethernet trunk.

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And in this Nugget, I'd like to
walk you through step-by-step

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how to configure the ports on
switches to behave as a trunk.

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We get to leverage delivers the
same topology that we used when

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we discussed the concepts, so
our primary job here is to go

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into the configuration on
switch-1 and switch-2 to these

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two ports--

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gig 0/0 on switch-1 and
gig 1/0 on switch-2 ,

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and specify that we want to use
802.1Q tags and that protocol

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for trunking.

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And in addition to
specifying the protocol we

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want to use for the
trunking, we also

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want to tell these
two port specifically

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that they are to
behave as trunks.

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And what I thought
would be also fun

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is to show you the configuration
for the access ports as well.

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So we'll do the whole thing
in this demonstration, which

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includes specifying that
gig 0/1 and 0/2 on switch-1

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are access ports in VLAN 100,
as well as switch-2's gig 1/1.

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And then we'll configure gig 0/3
on switch-1, as well as gig 1/2

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and gig 1/3 on switch-1
and 2 respectively

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that those ports should be
associated with VLAN 200.

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We'll also specify on the
respective switches that

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on these ports connected them
together that they should use

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802.1Q as the protocol and that
they should behave as trunks.

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And so with the
intent of this not

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being just a typing
exercise, let

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me walk through all
of the commands,

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and then we'll go ahead and
put them into the switches.

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On switch-1, we're
going to go ahead

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into configuration mode
on the Cisco switch.

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Our first two access
ports on switch-1

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are going to be gig
0/1 and gig 0/2.

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So we'll configure
those two access ports

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by going into interface
configuration mode for both

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of them at the same time and
using the command switchport

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mode access.

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This specifies the access port.

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Then we'll associated those
access ports with VLAN 100.

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Then we'll exit out of
that range configuration

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mode for those interfaces.

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And, then we'll go
specifically over to gig 0/3

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and do the same command
there-- switchport mode access,

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but on it, will specify
that it's in VLAN 200.

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Then exiting that
interface, we'll

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go over to interface
gig 0/0, which

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is the connection between
switch-1 and switch-2.

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And we'll specify
that we want to use

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dot1Q as the trunk encapsulation
with the command switchport

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trunk encapsulation dot1Q
and then the second command

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switchport mode trunk that
takes out any ambiguity that we

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want this port to be a trunk.

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And then we can exit out
of configuration mode

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and use the wr command which, is
the equivalent of copy running

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config to startup config.

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And the benefit of that is so
that when the switch reboots,

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it'll remember the configuration
that we're providing it

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right now.

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And then as we scroll
down and take a look

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at the commands for the second
switch, they're right here.

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And they're all very
similar commands.

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Working from the left to
the right on switch-2,

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we're going to configure gig
1/0 to use dot1Q encapsulation

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and to tell it to go
ahead and act as a trunk.

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We'll also going into
gig 1/1, configure

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it to be an access port
associated with VLAN 100,

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and then we'll go to the
interfaces gig 1/2 and 1/3

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to tell us which
of those two ports

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are access ports and then
also to associate VLAN 200

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with those access ports.

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Then we'll end to take us out of
configuration mode on the Cisco

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switch, and we'll
do a wr for write

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to save that configuration
so that when it reboots,

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the switch will continue to
remember the configuration

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that we're giving it right now.

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So I'll move these
commands over a little bit.

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And let's scroll
up, and we'll grab

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all the commands for switch
number 1 first, right click,

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Copy those.

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And then go to the
interface for switch number

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1, right click, which will go
ahead and paste that all in.

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So there's switch-1's
configuration.

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And let's go over to switch-2
and repeat the process.

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So here on switch-2,
we'll go get

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switch-2's configuration, right
click, put it in our clipboard

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in our buffer, and
I'll simply right

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click here in the interface
for switch-2, which

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we'll go ahead and paste it in.

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And I'll finish
it off by putting

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in the wr to save the
configuration to the startup

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config.

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And it is done.

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Now the big question
might be, OK Keith, we've

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configured some access ports.

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We configured the trunk ports.

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How do we verify it?

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Great question.

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We can verify the access ports
that we configured-- here

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we're on switch-2-- we
can verify those by using

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the command show VLAN brief.

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And that confirms that VLAN 100
has associated with it gig 1/1

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that port, and that
gig 1/2 and 1/3

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are associated with VLAN 200.

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So we're getting access ports.

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Perfect.

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Now notice here, as we
show our VLAN information,

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it's not showing us
in our list of ports,

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it is not showing us gig 1/0.

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And that's because gig 1/0 is
not acting as an access port.

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It's acting as a trunk.

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And we have a separate command
that we can use to see that.

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And that command would
be show interfaces,

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or you can use a shortcut of int
space trunk, and press Enter.

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And this allows us to verify
that gig 1/0 is currently using

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the encapsulation of 802.1Q
and is in the current status

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of trunking, which
is great news.

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And beyond just allowing
that range of VLANs

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to go across the
trunk, down here

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it's showing us that
it's actively forwarding

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and allowing VLAN's
100 and 200, which

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we're concerned with
in our typology,

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to be allowed over the trunk.

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Any traffic from those VLANs
as they go over the trunk are

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going to get an 802.1Q tag so
that the switch that receives

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that information over the
trunk knows exactly which VLAN

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the incoming frame belongs to.

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In this Nugget, we walked
through the process of both

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creating and verifying an 802.1Q
trunk going between two Cisco

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switches.

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I hope this has been
informative for you,

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and I'd like to thank
you for viewing.

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