How to route two different networks

Question

I'm trying to route two different networks using static routing, my problem is that I have 10 routers 4 in Lan1, 4 in Lan2 and 2 between Lan1 and Lan2, here is the topology:

I'm trying doing something like this:

My routing table for R1:

• 192.168.90.0 via 192.168.50.2
• 192.168.91.0 via 192.168.50.2
• 192.168.92.0 via 192.168.50.2
• 192.168.59.0 via 192.168.50.2
• 192.168.58.0 via 192.168.50.2
• 192.168.57.0 via 192.168.50.2
• 192.168.56.0 via 192.168.50.2
• 192.168.10.0 via 192.168.50.2
• 192.168.20.0 via 192.168.50.2
• 192.168.30.0 via 192.168.50.2

And I do almost the same for the others routers, what I want to know is if there is an easier way to do this, for example something like this:

R1:

• R1 -> R3 -> R4 -> R5 -> R6 -> LAN networks

I mean... instead of adding all my networks to my routing table just adding the next router network, or another easier way to do this.

Answer 1

Well, you could at least supernet 192.168.56.0/24, ..57.0/24, ..58.0/24, ..59.0/24 into 192.168.56.0/22.

192.168.50.0/24 through 192.168.53.0/24 would go into 192.168.48/21 (including some collateral damage).

192.168.90.0/24 through 192.168.92.0/24 could go into 192.168.88.0/21 (again, somewhat more).

If you don't require default routes for the Internet, you could use those as shortcuts:

R1: 192.168.52.0/24 -> 192.168.51.2; default -> 192.168.50.2

R2: equivalent

R3: two routes to left subnets, default -> 192.168.90.2

and so on.

Alternatively, you could at least aggregate consecutive even/odd subnets into a single route.

To your question: if you don't mind non-optimal routes you could actually have the edge routers route in a circle by default gateway and only let R3-R6 use educated routes.