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Can A Router Emulate A Layer 3 Switch

Unanswered Question
Nov 21st, 2008
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I am building my CCNP lab. Currently I have three 2950 switches and a bunch of routers (3640s and 2610s). I need to practice layer 3 switching, but they seem to start around $200.


Can I use a 3640 with 6 ethernet ports as a layer 3 switch? I know it will switch, but how different will the CLI be?

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Edison Ortiz Fri, 11/21/2008 - 11:22
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You can create switch virtual interfaces (SVI) in the 3640 and route between them.


For instance:


Create Vlan 2,3,4


vlan database

vlan 2,3,4

exit


On Port 1 and 2 assign to Vlan 2

On Port 3 and 4 assign to Vlan 3

On Port 5 and 6 assign to Vlan 4


interface fx/x

switchport access vlan [vlan-id]


Then create SVIs for each Vlan.


interface Vlan 2

ip address 192.168.2.1 255.255.255.0


interface Vlan 3

ip address 192.168.3.1 255.255.255.0


interface Vlan 4

ip address 192.168.4.1 255.255.255.0



Then place end devices on those port and ping across to test connectivity.


HTH,


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Edison.


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Giuseppe Larosa Sat, 11/22/2008 - 09:46
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Hello Edison,

this is possible only on ports of an etherswitch module or also on normal ethernet ports ?

It's not clear if the device has the etherswitch module on it or the 6 lan interfaces are made of built in + other network modules


Hope to help

Giuseppe


Edison Ortiz Sat, 11/22/2008 - 12:29
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Correct, my assumption was based on the 3640 having a L2 etherswitch port module. I don't think you can have 6 regular Layer3 ports in a 3640, but I can be mistaken.


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Edison.

chull6509 Mon, 11/24/2008 - 08:33
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To clear up the hardware config, the 3640 came with a NM-2E2W and I added a NM-4E to it. The IOS is 12.4(10a). I am mostly interested in learning the CLI for the switch, and if the commands are very different from the 3640.

Edison Ortiz Mon, 11/24/2008 - 08:39
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The modules mentioned are regular ethernet ports and will not provide you with the typical Layer 3 switching from a Catalyst model.


I suggest investing on a 3560 8 Port switch for full CLI experience on Layer 3 switching w/ Cisco Catalyst.


If you begin Layer 3 switching w/ a router, it may introduce more confusion in your early days.


HTH,


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Edison.

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