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CISCO SWITCHES FOR SMALL and MEDIUM BUSINESS

Introducing the next generation of Cisco Small and Medium Business Switches. Cisco is refreshing its SMB Switch portfolio. Click here  to learn more.


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Gregrunt92
Beginner

Cisco SG200-50 VLANs

Hey, so I've been working with the aforementioned switch for a week or two, tinkering in an attempt to find a configuration that suits the needs of an apartment I'm living in. Quick disclaimer, I'm not the most tech savvy person, so command line configuring won't be the most effective way for me to go about this, however, the web interface is completely manageable for me. Now onto the problem.

I have 3 separate business lines coming into the apartment from the same company. As much as I would like to upgrade or just have one, let's pretend that's out of the picture. Those each proceed into 3 modems, which, as of now, proceed into 3 routers to distribute the connection to various rooms. What I would like to do, is have the 3 lines (through the routers or not) go into the switch while allowing communication between ALL of the members of the 3 networks (so that, say, a person on network A can access a printer on network C). I've run into problems, however with IP addresses which is why the routers cannot be run directly into the switch themselves. I've looked into VLANs but cannot find a way to split these incoming connections while allowing the members of all 3 networks to communicate with each other.

In summation: 3 modems--> 3 (separate) routers --> Switch (VLANS?) -->  Clients (who can all communicate with each other).

Is this even possible? Multi-WAN routers? Link Aggregation and Load balancing? Help?

-Greg

6 REPLIES 6
Tom Watts
Advocate

Hi Greg,

With this scenario, your routers have to manage the inter-lan communication. The switch is only a layer 2 device. It understands vlan but it does not route traffic. All traffic will route to the router then forward to the destination.

-Tom
Please rate helpful posts

-Tom Please mark answered for helpful posts http://blogs.cisco.com/smallbusiness/

Tom,

That's a breath of fresh air. I had a feeling the switch wouldn't be able to manage this. How could I go about getting the routers to communicate with each other then? This is where I would run into conflicts with IP addressing.

-Greg

Greg, it sounds like you need a lot of static routes.

But honestly, you can buy a RV016 router, it supports up to 7 WAN. That would simplify that. Then you can make protocol binding rules for which traffic to which WAN to use and you could use the switch to get the extra 50 ports as desired.

-Tom
Please rate helpful posts

-Tom Please mark answered for helpful posts http://blogs.cisco.com/smallbusiness/

I know layer 3 switches have the ability to route between VLANs. Could that be a solution? Or would there still be subnetting issues needing to be accounted for?

Hi Greg, the SX300 and SX500 are both layer 3 capable. When you create a vlan and add an ip address to the vlan interface, the switch will dynamically build an ip route for the directly connected interfaces. What to account for is how you set the default gateway of the computers.

-Tom
Please rate helpful posts

-Tom Please mark answered for helpful posts http://blogs.cisco.com/smallbusiness/

HI Greg,

   SG200 Switches Does not Support the Routing Functions,  if you want to communicate with  each others in your Apartments  u need to do inter VLAN Routing for  all VLans Which you have created for each line.

SMB SG300 Series Switches Do support up to 32 Static Routes (Inter Vlan Routing) / SG 500 Series Do support more Static Routes.

And Also Instead of using 3 Separate Routers For 3 LInes, We can Suggets RV Series RV016 Multi WAN Port Routers Having upto 7 WAN Ports.

Below are the  RV016 Router Configuration Guide Documents.

http://www.cisco.com/en/US/docs/routers/csbr/rv0xx/administration/guide/rv0xx_AG_78-19576.pdf