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How can I tell if our Cisco 4006 is layer 2 or layer 3?

How can I tell if our Cisco 4006 is layer 2 or layer 3?  We are running CatOS.  Is there a command or some way to tell if we are running layer 2 or 3?
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bpl5000
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bpl5000
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mr_dirtCommented:
Catalyst 4000s require a routing module to offer L3 (routing) capability.  If you don't have a routing module, then the switch is a L2-only box.  If you have a router module and need to determine how the routing is configured, have a look at:
http://www.cisco.com/en/US/products/hw/switches/ps663/products_tech_note09186a0080094959.shtml 
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Vito_CorleoneCommented:
Post the output of "sh mod", this will tell us for sure. But, it's likely that your device is only L2.
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bpl5000Author Commented:
Yes, we do have a routing module and I was 99% sure it was layer 3.  Slot 4 has a WS-X4232-L3 card so I should have realized the L3 at the end is for Layer 3.
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Vito_CorleoneCommented:
Then yes, you should have routing capabilities.
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Don JohnstonInstructorCommented:
If you're running CatOS on a 4000 series platform, it's a layer 2 switch.
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bpl5000Author Commented:
donjohnston, are you sure?  I entered session 4 and it brings me to a prompt that says "router".  I checked the config of the router and there is a port-channel for each vlan with the ip helper-address listed and all seems to be working well.  Are you sure this is not layer 3?
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Don JohnstonInstructorCommented:
Fuzzy area here.

CatOS is a layer 2 OS... No exceptions.

What you have is a Layer 3 module installed. But... it is a separate device that just happens to "live" inside the chassis. In order to configure it, you must "connect" to it. You do this using the session <mod #> command. Once you do this, you are manipulating a completely different operating system with a completely separate configuration.

Another way to think about is that it's like a traditional router that just happens to have a really fast connection to the 4006.

Of course, this is just semantics. Since the module is IN the 4006 (layer 2 switch) and it is a layer 3 module then that would make your switch a "multilayer" switch.

I just choose to reserve the "multilayer" designation for switches with a single OS that can do layer 2 and layer 3.

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Vito_CorleoneCommented:
That's an odd perspective. We have hundreds of 6500s running SUP2s running Hybrid (CatOS and IOS), and I would most definitely call them multilayer/layer 3 switches.
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Don JohnstonInstructorCommented:
And if you have a FW module installed would call your 6500 a firewall?

And if you install an IDS module installed, is it now an Intrusion Detection System?

And if you install an IPSEC/VPN module, is your 6500 now a VPN concentrator?

If you have all of these installed, is your 6500 a switch/firewall/IDS/VPN?

I'm just saying... ;-)
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Vito_CorleoneCommented:
Hahaha. I see your point. I still won't be calling our 6500s L2 switches though.:-P
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mr_dirtCommented:
While I'll agree that CatOS and the switch fabric of the 4K only offer Layer 2 capability, once you install and configure a Layer3 module, the device has Layer 3 capability.  

bpl5000, do you need more details to answer your question?
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