Switches and routers technology - 24 - configure OSPF single area

0SPFRouting single area configuration

Configuration process

1) Create an OSPF process with a process ID ranging from 1 to 65535.

Router ( config )# router ospf [ process - id ]

2) Configure the ID of the current route, which is equivalent to the name of each router in OSPF. It cannot be the same in the same area. The format is the same as the P address.All are dotted decimal, and the value range is 0.0.0.0~255.255.255.255.If not specified, the one with the largest physical address is selected by default.

Router ( config - router )# router - id [ id - number ]

3) Publish the directly connected network to OSPF. The difference between this and the RIP protocol is that the anti-mask of the corresponding network segment needs to be added when publishing.code and area number.

Router (config-router)# network network - address Wildcard - mask area -n umber

The inverse mask is four 255 minus the mask

Configuration example

Router R1

Router>enableRouter#conf tEnter configuration commands, one per line. End with CNTL/Z.Router(config)#interface g 0/0Router(config-if)#ip address 192.168.10.254 255.255.255.0Router(config-if)#no shutdownRouter(config-if)#exitRouter(config)#interface g0/1Router(config-if)#ip address 10.10.10.1 255.255.255.252Router(config-if)#no shutdownRouter(config-if)#exitRouter(config)#router ospf 10Router(config-router)#router-id 1.1.1.1Router(config-router)#network 192.168.10.0 0.0.0.255 area 0Router(config-router)#network 10.10.10.0 0.0.0.3 area 0

Router R2

Router>enableRouter#configure tEnter configuration commands, one per line. End with CNTL/Z.Router(config)#interface g0/0Router(config-if)#ip address 10.10.10.2 255.255.255.252Router(config-if)#no shutdownRouter(config-if)#exitRouter(config)#interface g0/1Router(config-if)#ip address 20.20.20.1 255.255.255.252Router(config-if)#no shutdownRouter(config-if)#exitRouter(config)#router ospf 10Router(config-router)#router-id 2.2.2.2Router(config-router)#network 10.10.10.0 0.0.0.3 area 0Router(config-router)#network 20.20.20.0 0.0.0.3 area 0

Router R3

Router>enableRouter#configure tEnter configuration commands, one per line. End with CNTL/Z.Router(config)#interface g0/0Router(config-if)#ip address 20.20.20.2 255.255.255.252Router(config-if)#no shutdownRouter(config-if)#exitRouter(config)#interface g0/1Router(config-if)#ip address 192.168.20.254 255.255.255.0Router(config-if)#no shutdownRouter(config-if)#exitRouter(config)#router ospf 10Router(config-router)#router-id 3.3.3.3Router(config-router)#network 20.20.20.0 0.0.0.3 area 0Router(config-router)#network 192.168.20.0 0.0.0.255 area 0

PC0

Pc1

PC0 ping PC1

View command

View ospf configuration information

show ip ospf

View Neighbors

show ip ospf neighbor