Look on the router Serial interfaces. I just added the ip address and enabled all the interfaces for that 4 routers. You need to keep doing for the others routers.
You can use a subnetwork calculator to find the ip address
Hi
I will attach here my file in case you want to compare the config. I used DHCP for all PCs instead static IP address.
And I used OSPF for dinamic routing netween routers and L3 switches.
I test and I can ping from any PC to any PC. The topology is fully working.
Just make sure, if you were run test, that the PC is actually in DHCP mode. There are too many PCs so, I might not change some of them.
But it is pretty easy to change as you can see here
