Cable modem cisco Layer 3 switch

Posted on 2013-05-19
Last Modified: 2013-09-20
Hello is there anyway to hook up my modem directly into my cisco layer 3 switch and use it as a router? My cable modem is not static by the way
Question by:mrbayIt
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LVL 95

Expert Comment

by:John Hurst
ID: 39179776
The articles below suggest (1) some Cisco switches can work as routers and some cannot and (2) using a router for routing tasks and a switch for switching tasks.   and

Is there an advantage to be gained for you to use a switch in place of a router?  

I use a Cisco RV042G router from my cable modem and it is as fast or faster than the cable modem so it doesn't present any limitation to me.

.... Thinkpads_User

Author Comment

ID: 39179834
I just have an old router and would like to use my 3560g switch partly to experiment part to use because it's probably better than my old link sys router
LVL 95

Expert Comment

by:John Hurst
ID: 39179842
A Cisco 3560g should work as a router, but it will probably take more configuration that a router designed for the purpose. I assume the "g" means it is gigabit like my RV042g (which is also gigabit). Yes, almost for certain, it will be faster and probably more reliable than an old router. I have replaced may of those since I first had broadband in 1999.

Can you use your Cisco 3560g as a router? Yes.  As to configuration to do it, you would need a Cisco switch configuration expert (not I).  

.... Thinkpads_User
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LVL 22

Expert Comment

by:Matt V
ID: 39192176
The switch configuration is a little more involved than a Cisco router, but setting up a Layer3 siwtch to be your router is not that difficult.

I used an old Catalyst G-L3 model that used BVI interfaces instead of VLANs, it worked great.

Author Comment

ID: 39192524
Can you give me the instructions

Author Comment

ID: 39509827
matt can you give instructions please
LVL 22

Accepted Solution

Matt V earned 500 total points
ID: 39510674
I believe all you need to do on the VLAN capable routers is

config terminal
int vlan 100
ip address
ip route <your cable modem inside ip>
router rip

Point your clients to the address for their gateway.

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