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2 Routers, 1 Network and an argument2 Ro

By JP. ·
2 Routers, 1 Network and an argument

We have two offices that have recently come together. Previously each office has its own router using BRI which connects to a central router in another location, which in turn connects via a 256k frame relayoverseas.

Now we have joined both offices and networks. Here is where the argument starts. My college insists that we will need to divide the network into 2 subnets and assign the router 2 IP?s (one for each subnet), if we wish to continue to have users use both routers. I can not see why this is the case.

So who is right?

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2 Routers, 1 Network and an argument2 Ro

by ciscokid916 In reply to 2 Routers, 1 Network and ...

Each router interface must have a designated IP address in order to properly comunicate. The central router uses 2 interfaces to connect to the 2 local routers inturn using two IP addresses.


Shane

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2 Routers, 1 Network and an argument2 Ro

by JP. In reply to 2 Routers, 1 Network and ...

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2 Routers, 1 Network and an argument2 Ro

Okay, here is the way I understand this. You have one big LAN that used to be two not so big LANs. Your company wants you to use both routers. If the single LAN is not subnetted, you only want to use the one router. If you are having trouble talking them into this, try this argument: It would be less expensive to use a single, larger pipe into the building. Also, it is highly recomended to reconfigure the second router (I am assuming it is a lower level router such as a Cisco 1600, Netopie or similar) just like the first so, if one goes down, you have something to plug in immeditely and down-time is minimized.

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2 Routers, 1 Network and an argument2 Ro

by JP. In reply to 2 Routers, 1 Network and ...

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2 Routers, 1 Network and an argument2 Ro

by -Q-240248 In reply to 2 Routers, 1 Network and ...

Let's see if I have this straight. I order for you to use both routers, your collegue syas that you must use two different subnets? True. Can't use two routers to provide services to one same subnet. Which one would route to the same address? There would be routing loops..etc. You CAN use one router for multiple or single subnets.

I wouldn't even use two routers. And even if I did, I would configure one (Cisco) as an HSRP router (stand-by router). If you only have one WAN link, two routers in a serial path would be a waste and would require additional routing. I would use one router, one local subnet for the entire office, provided you have enough IP addresses. Even if that were the case, some routers can have multiple subnets using sub-interfaces.

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2 Routers, 1 Network and an argument2 Ro

by JP. In reply to 2 Routers, 1 Network and ...

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2 Routers, 1 Network and an argument2 Ro

by McKayTech In reply to 2 Routers, 1 Network and ...

I'm a little slow sometimes on these consolidation questions, but when you say "joined", do you mean physically (i.e. that they now share the same physical location)? If so, then you really have one physical network, one WAN connection and one BRI router. You are then right.

If you mean "joined" as in "one big happy family with two locations", then your colleague is right. Each location should be a subnet with an interface connected to the central router.

If you mean "joined" as in "one big happy family with two locations and a connection both between the locations as well as independent connections to the central router", your colleague is still right but you'll want to define the primary route to overseas as via the central office interface with a metric of 1 with a secondary route via the other office with a metric of 2.

But it all depends on what you mean by "joined".

regards!

paul

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2 Routers, 1 Network and an argument2 Ro

by JP. In reply to 2 Routers, 1 Network and ...

Thank you all, it has been a real education but now I owe $20.

Thank you for all your help

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2 Routers, 1 Network and an argument2 Ro

by JP. In reply to 2 Routers, 1 Network and ...

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