OSPF routing
| conf t | 
| enter into configuration mode on #main router | 
| router ospf 1 | 
| configuring OSPF with OSPF ID 1. This ID should be the same on the other routers. | 
| router-id 200.200.200.200 | 
| create router ID | 
| network 10.0.0.0 0.0.0.3 area 0 | 
| share network. Instead of the 255.255.255.252 subnet mask it is the reverse of the subnet mask. Area is 0, for example defining at a Core level. For more remote users higher area number should be used by segments. | 
| end | 
| conf t | 
| enter into configuration mode on the routers | 
| router ospf 1 | 
| configuring OSPF with OSPF ID 1 | 
| network 10.0.0.0 0.0.0.3 area 0 | 
| network 192.168.2.0 0.0.0.255 area 0 | 
| share network | 
| router-id 200.200.200.200 | 
| create a router ID | 
| passive-interface fa0/1 | 
| permit share routing on the specified interface, because there is no router there side | 
| conf t | 
| enter into configuration mode on #main router | 
| ip route 0.0.0.0 0.0.0.0 10.0.0.2 | 
| router ospf 1 | 
| default-information originate | 
| share the common settings with the connected OSPF routers | 
| int fa0/0 | 
| bandwidth 50 | 
| set bandwidth in kilobyte value | 
| ip ospf cost 1 | 
| set communication cost numerical value | 
| exit | 
| ip ospf authentication-key 1 cisco | 
| define authentication key | 
| no area 0 authentication message-digest | 
| setup authentication | 
| show ip ospf neighbor | 
| neighbor information | 
| show ip ospf | 
| detailed information for diagnostics | 
| show ip route ospf | 
| show only ospf routes | 
| clear ip ospf process | 
| reset ospf settings | 
| end | 
 
			





