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VLan's for LAN Extension

Posted on 2006-10-26
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Last Modified: 2008-02-01
Hi Experts,

We have just gotton a WAN link upgrade to a 100MB FDX LAN extension which is connecting two geographically seperated offices and am trying to figure out if I could use VLANs instead of routers to connect the offices. Here's my network setup.

The offices are on seperate subnets and are part of the same domain.
We have a 10mg WAN link now connecting the offices which we will be decomissioning after we complet the transition to the LAN extension.
There are 2 DC's per office and of course DHCP servers in each office. Each office has it's own Gateway.
We have VLAN compatible switches on each end.

Basically I know I can use routers on each end to establish the WAN link. But Can this be done with VLAN's?
Some setup tips would be greatly appriciated, I can't figure out how traffic from 1 subnet would know to get to the other subnet without routing.

Thanks in advance

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Question by:mike0107
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by:lrmoore
ID: 17814760
>I can't figure out how traffic from 1 subnet would know to get to the other subnet without routing.
That's the problem with using switches. As long as they are separte subnets or VLAN's, then you must have some routing in the mix. Either a single "router-on-a-stick" or a router at each end to create the WAN link and do the routing.
A Layer3 switch would be most advantagous and best performing.

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Author Comment

by:mike0107
ID: 17815020
Thank you for your comment Irmoore, let me ask you this in a Router on a stick setup would the router connect to one interface in one city? Also I'm thinking that we will just go with two Routers 1 per city and do it the old fasion way. Would you be so kind as to recomend what routers you would use. There are 100+ users in one city and 50 users in the other. We would just want a simple routing setup.  
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Author Comment

by:mike0107
ID: 17815143
One more addition to this question.

If we had a layer 3 switch in one of the city's would it be setup so that the gateway for one city would actually reside accross the wan link.  
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Expert Comment

by:lrmoore
ID: 17815415
>in a Router on a stick setup would the router connect to one interface in one city?
Yes.

>Would you be so kind as to recomend what routers you would use.
Most anything with 100Mb interface. Cisco 2801 should be adequate. Create vlans on the switches, trunk an uplink to the router and create a sub-interface on the router. That's about as simple as it gets.

>If we had a layer 3 switch in one of the city's would it be setup so that the gateway for one city would actually reside accross the wan link.  
Yep. Same if you have a router on a stick.
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Author Comment

by:mike0107
ID: 17819185
Last addition IRmoore.

If we decide to put a CISCO router in each office would the 2801 be powerful enough. The WAN link is a 100MB FDX connection,
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Author Comment

by:mike0107
ID: 17819229
I guess we could also have one router in one office. HAve the lan EXt plug into one port and the other port plugs into the network of whatever city it resides in. Some of my fellow IT guys seem to favor one router one city. But I wonder how much Broadcast traffic would come accross the LAN ext. I like 2 routers 1 per city, maby thats because this is the usual WAN config.
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lrmoore earned 500 total points
ID: 17819987
You can go either way. I'd start with 1x 2801 dual-Ethernet router at one end. If it becomes an issue, you can always put one on the other end..
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by:mike0107
ID: 17820056
Sounds great here's the points.
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