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Cisco Switching from Layer 2 to Layer 3

Posted on 2013-10-28
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Last Modified: 2013-10-29
Hi,
I'm new to layer 3 switching and want to see if I can get some help. Currently I have no vlans, and everything works. However I would like to do the below configuration and have vlan 10 and vlan 20 talk to each other. Can someone guide me on what I need to do on switch l2 (layer 2) and l3 (layer 3)? I'm assuming the layer 3 switch will do the routing, but I don't know how the uplink plays into the vlans and how to configure the Layer 3 switch. Switch L2 is a layer 2 switch and Switch L3 is a layer 3 switch. Can someone please help me understand how to configure this scenario?


Switch L2

Port 10 / 192.168.1.4 - Client PC - vlan10 - I know how to make this a vlan
ip address: 192.168.1.4
subnet address: 255.255.255.0
gateway: 192.168.0.???? - What do I do here, put the internet gw 192.168.0.1

Port 20 / 192.168.2.2 - Client PC - vlan20 - I know how to make this a vlan
ip address: 192.168.1.4
subnet address: 255.255.255.0
gateway: 192.168.0.???? - What do I do here, put the internet gw 192.168.0.1

Switch L3

Port 1 / 192.168.0.1 - Internet - I don't know what to do here either.

1 Uplink from Switch L2 port 32 to Switch L3 port 33. - I don't know how to carry all the vlan traffic from switch l2 to the layer 3 switch.
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Question by:jasonmohan
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Expert Comment

by:fgasimzade
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Ok, you would need to create 2 interface vlan on L3, one for each vlan

For example

conf t
interface vlan 10
ip address 192.168.1.10 255.255.255.0

interface vlan 20
ip address 192.168.2.20 255.255.255.0

These IP addresses will be a default gateway for your vlans respectively.

After you configured this, you need to configure a static route for internet connection.

Most probably it is going to be

ip route 0.0.0.0 0.0.0.0 192.168.0.1 where X is your interner router/modem

What is your connection from L3 to Internet gateway?
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Author Comment

by:jasonmohan
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I have a Cisco ASA at 192.168.0.1 uplinked on port 1 of the Layer 3 switch, and port 1 on the Cisco ASA switch.

What do I need to do on the uplink port from layer 2 to layer 3 switch? I read some stuff regarding trunking but wasn't sure if I needed to add that, and how.
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Accepted Solution

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fgasimzade earned 500 total points
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You need to create vlans on both L2 and L3 switches and configure uplink ports between them in this manner:

conf t
interface fastethernet x/x
switchport trunk encap dot1q
switchport mode trunk

Then make sure you can ping interface VLANs' ip addresses from your PCs connected to L2 switch

When it comes to Internet, I would suggest configuring a new VLAN for communication between L3 and ASA

interface vlan 30
ip address 192.168.0.2 255.255.255.0

Then configure a port on L3 connected to ASA with vlan 30

Make sure you can ping from L3 to ASA 192.168.0.1

Dont forget about

ip route 0.0.0.0 0.0.0.0 192.168.0.1
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Author Closing Comment

by:jasonmohan
Comment Utility
Thanks for the help, and taking the time to explain.
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