How to interconnect routers

[Ed Lo]

Hi,

I need to connect routers together so that traffic is pass through them and they are able to communicate with each other. My goal is to connect two1941w routers to one 2911 router. The two 1941w routers will have their own subnetworks and I want traffic to pass through the 2911 and to the 1941w routers. How would I configure the routers to accomplish this?

thank you

[LJ Gabrillo]

So your basically asking how to configure a router to do routing? XD
Anyway, your question is too broad, that's how router's work

Do you already have a network diagram for your deployment? If not yet, i'd advise to start with that first 

[Joseph W. Doherty]

There are many ways to configure your routers, to route.

For example, if doing static routing, each 1941 might have a default route pointing to the 2911 and the 2911 would have static routes for all the routes on the "far side" of each 1941.

Of, for example, you might enable a dynamic routing protocol on each of your three routers, configure each router to place its networks into the routing protocol, and the routing protocol will then share each router's routes with the other routers.

BTW, by default, routers will route between their own interface networks. Networks not local (i.e. connected) to a specific router is what you need, somehow, to inform the router about.

[Julio E. Moisa]

Hi

I think you have received good answers, now some useful additional tips:

I recommend use /30 (255.255.255.252) subnets between the devices for example you could use the following networks to interconnect the 3 routers:

10.0.0.0/30  Router 1 and Router 2

10.0.0.4/30  Router 2  and Router 3

10.0.0.8/30  Router 3 and Router 1 (if it is a traingle)

With this you will avoid any wasting of IP addresses. 

**Some devices support /31 networks. 

Now how each router will have their own subnets you need to use a routing protocol like RIPv2, EIGRP, OSPF. Talking about routing protocols is a extensive topic but you can evaluate what protocol is the best for you. Static routing is other option but difficult to manage it when the networks growth.

Also you can use copper cables (CAT 5e or 6 for example), also through serial interfaces and some routers support fiber.

Hope it is useful

:-)