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Okay, so let's see if we can configure this topology.

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I'm gonna start off by configuring the call 3650 switch.

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So this is a multilayer switch

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which means that we need to configure multiple IP addresses on the switch and enable IP routing between

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the VLANs. So the first thing I'm gonna do is create the VLANs, VLAN 10, VLAN 20, VLAN 30

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and VLAN 100.

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So show VLAN should show us the VLANS and there you go

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we'll make this a bit bigger.

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So again show VLAN and I'll use brief here.

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Here's the command.

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We can see that all interfaces are currently in the default VLAN.

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We've got VLANs 10, 20, 30, and 100 configured but no interfaces are in those VLANs.

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So interface gigabit 1/0/20 this is the interface where our server is now a good check to use is do

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show IP interface brief and verify that the interface is up.

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That helps you check whether you're working on the right interface in your lab.

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This interface is up up.

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So that's a good sign.

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So I'm gonna type switch port access, switch port access VLAN 100, show interface gig 1/0/20 switch

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port.

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This will allow us to check that our configuration is correct on the interface.

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So there's the show command this interface is enabled as a layer 2 port, we're using static access it's

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operating as a static access port.

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In other words it's an access port and not a trunk port.

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The VLAN used is VLAN 100.

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So that looks good.

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So I now need to configure the other interfaces so before I do that show IP interface brief, we can see

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that these interfaces gigabit 101,102 and 103 are currently up, show run shows us that at the

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moment no configuration has been applied on the interfaces now these ports gigabit 101 102 and 1

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03.

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Need to be configured as trunk ports down to the switches so interface gigabit 101 switch port mode,

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Trunk.

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Notice you may get an error in the real world or on your switch depending what it is.

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You may have to specify the encapsulation as dot1q before you specify switch port mode

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Trunk that often depends on the switch.

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So you may need to set the encapsulation and then you can specify the mode as trunk.

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So I'm gonna do that on all three ports encapsulation is dot1q mode is gonna be trunk.

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Now show run, shows us what we've done.

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Notice each port is configured to use a dot01q and to use trunking.

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That's correct because we've been told to configure ports between switches as trunks.

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That's also best practice in a layer 2 infrastructure, so to prove that we could type show interface

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gigabit 101 switch port.

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Notice on gigabit

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101

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there's the show command, on this port

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it's administratively configured as a trunk.

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It's operating as a trunk, encapsulation used is a dot1q native VLAN is VLAN 1 which is correct.

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So what we've done thus far is configure the three ports to the access switches as trunk ports, we've

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configured the port to the server as a access port in VLAN 100.

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The next thing we need to do is configure switched virtual interfaces or SVIs to enable inter VLAN

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routing. VLAN 1 is the default VLAN it's currently down so I need to enable that and I need to configure

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the switch with IP address 10.1.1.254/24 mask per our instructions the other SVIs

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or switch virtual interfaces are gonna have these IP addresses so interface VLAN 10, IP address

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10.1.10.254/24 mask, no shut interface VLAN 20, IP address 10.1.20

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254 no shut, now the interfaces are coming up but from experience, I always no shut the interface

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there's gonna be no harm in doing that if it's already up that's great but if it's down we are ensuring

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that the interface comes up.

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So there's no problem doing that just to be sure,

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interface VLAN 100, 10 1 100 254/24 mask, no shut the interface.

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Okay so show IP interface brief, notice we have interfaces up, notice my mistake I configured VLAN 40

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that's not required and notice the SVI is down because no interface is configured in that VLAN and

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that VLAN doesn't exist in the VLAN database, so I'm gonna remove that SVI.

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so interface VLAN 40 is removed.

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Show VLANs shows us that VLAN 40 is not in the VLAN database.

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So again if I created interface VLAN 40, no shut that show IP interface brief would show me that

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the interface is down because that VLAN doesn't exist in the VLAN database. You've got to have

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the VLAN in the VLAN database for the switched virtual interface to come up. So again I'll remove

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that no interface VLAN 40. Okay,

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one thing we still need to do on the core switch is enable IP routing, IP routing is not enabled by default.

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we've got to enable IP routing to allow the switch to route from one SVI to another. So as soon as you

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start creating multiple SVIs and the switch is gonna be your layer 3 switch all the switch that

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does the inter VLAN routing you must enable IP routing on that switch.

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Okay, so at this point I'm gonna save the configuration of the switch let's configure the access switches

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and then we'll be able to test whether the core switch is configured properly.