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Now that we've configured ether channel on the call switches we need to configure layer three interfaces
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on the call switches and enable into VLAN routing.
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Call 1 is going to be configured with IP addresses 10 dot 1 dot 1 2 5 1 in VLAN 1 and call 2 with IP
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address 10 dot one that 1 to 2 5 2 and then something similar will be configured on all of the other
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v lands on both switches so he has call 1 to enable into VLAN routing.
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We need to use the common IP routing now before I type that command.
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Notice the output of show ip route.
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It shows us that a default gateway is not set.
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That means that IP routing is not enabled on the switch as soon as I enable IP routing the show IP right
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command shows us a very different output.
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We see something like this instead of what we saw previously.
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So one of the first things you need to do on a layer 3 switch is enable IP routing IP routing is not
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enabled on most switches by default.
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So you need to enable that first and then what we can do is configure IP addresses on what are called
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the switched virtual interfaces or SVR eyes so the command VLAN 1 or VLAN 10 would create a villain
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in the villain database but the command interface VLAN 1 creates a switched a virtual interface or a
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layer 3 interface.
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And notice the difference.
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Now when I use the command show IP right we don't see that route in the writing table.
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But notice what happens when I know shutter the interface.
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Show IP right shows us that right in the IP routing table.
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As soon as I create another switch to a virtual interface let's say for VLAN 10 and give the switch
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an IP address in that villain that network becomes available in the IP routing table.
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These switched off virtual interfaces or S V I's all layer 3 interfaces for specific v lands on the
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layer 3 switch.
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So this is the layer 3 interface for VLAN 10.
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This is the layer 3 interface for VLAN 1 and I would do something similar for Vigeland 20 tendered 1
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or 20 2 2 5 1
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interface V Line 30 IP address 10 1 3 2 5 1 Notice the difference of villain 1 was shut down by default
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but these SFE I's come up by default in the real world
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verify the state of your SVR eyes by using the command show IP interface brief make sure that these
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interfaces are up on your switch to show IP right now.
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Notice the interfaces are shown in the IP running table and I should as an example be able to ping my
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local IP addresses these VLAN one v lan 10 v land 20 30 and 100.
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So that looks good.
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We need to do something similar on the switch.
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So just to show you the point again.
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Show IP it shows nothing in the IP routing table at the moment this command and output shows us that
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IP routing is enabled.
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Notice we see this rather than this to show IP rot here shows us ICMP redirect caches empty.
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If you see that output it means that IP routing is disabled IP routing shows us if we have lost result
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and you see all of these codes that means IP routing is enabled on the switch.
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No routes are currently in the writing table by default VLAN 1 is shut down.
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We can see that by using the command show IP interface brief and in this case I'm going to use do because
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I mean config interface mode.
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Notice villain one is down administratively down I need to know shut the interface to bring it up.
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So if we do the show IP interface brief command again.
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Notice the interface is now up as soon as I use the come on IP address tendered 1 1 2 2 5 1 on this
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case 2 5 2 and now use the command.
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Do show IP round we can see that round in the IP routing table.
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So let's create additional SFE eyes V Line 10 IP address tendered 1 10 0 2 5 1.
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Or should I say 2 5 2 VLAN 20.
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This will be 20 2 5 2 VLAN 30.
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This will be 30 2 5 2 and then interface feel and 100 IP address 10 1 100 2 5 2 with Slash 24 mosque
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always verify what you've done so show IP interface brief make sure that you have done what you think
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you've done.
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I like the following saying a Cisco device does it to what you tell it to do not what you think it should
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do.
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It will only do what you tell it to do through the commands that you've typed through the sea a lie.
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Sometimes we think we've done something when we haven't.
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So make sure that you verify your configuration.
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As an example can we paying ourselves on VLAN 1.
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Yes we can.
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What about call 1.
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Yes we can.
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On VLAN 1.
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So let's test it this way.
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Can call 1 ping core 2 on villain 1 Yes it can.
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What about a V Line 10.
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Yes it can.
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Vigeland 20 yes it can.
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30 that's good.
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One hundred.
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That's good.
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So we've configured IP addresses on the two core switches per our instructions and we've configured
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into VLAN routing the command IP routing enables into VLAN routing on layer 3 switches and interface
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VLAN and a number such as one creates the XVI on the switch allowing us to configure IP addresses the
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next step is to configure IP addresses on our access switches.
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