Task 4: Configure OSPF on the DR router
Step 1: Use the router ospf command in global configuration mode to enable OSPF on the R3 router

R3(config)# router ospf 1
R3(config-router)# network 192.168.1.0 0.0.0.255 area 0
R3(config-router)# end
R3#



Step 2: Use the show ip ospf interface command to verify that the OSPF has been configured correctly and that R3 is the DR

R3# show ip ospf interface

Task 5: Configure OSPF on the BDR router
Step 1: Use the router ospf command in global configuration mode to enable ospf on the R2 router
R2(config)# router ospf 1
R2(config-router)# network 192.168.1.0 0.0.0.255 area 0
R2(config-router)# end

Step 2: Use the show ip ospf interface command to verify that the OSPF has been configured correctly and that R2 is the BDR

R2# show ip ospf interface

Step 3: Use the show ip ospf neighbors command in global configuration mode to view information about the other routers in the OSPF area

R2# show ip ospf neighbors

Task 6: Configure OSPF on the DRother router
Step 1: Use the router ospf command in global configuration mode to enable OSPF on the R1 router
R1(config)# router ospf 1
R1(config-router)# network 192.168.1.0 0.0.0.255 area 0
R1(config-route)# end

Step 2: Use the show ip ospf interface command to verify that the OSPF has been configured correctly and that R1 is a DRother

R1# show ip ospf interface

Step 3: use the show ip ospf neighbors command in global configuration mode to view information about the other routers in the OSPF area.

R1# show ip ospf neighbors

Task 7: Use the OSPF priority to determine the R1 sebagai DR and R3 sebagai BDR
Step 1: Use the ip ospf interface command to change the OSPF priority of the R1 router to 255

R1(config)# interface fastethernet 0/0
R1(config-if)# ip ospf priority 255
R1(config-if)# end

Step 2: Use the ip ospf priority interface command to change the OSFP priority of the R3 router to 100
R3(config)# interface f0/0
R3(config-if)# ip ospf priority 100
R3(config-if)# end
R3(config)#

Step 3: Use the ip ospf priority interface command to change the OSPF priority of the R2 router to 0
R2(config)#interface fastEthernet0/0
R2(config-if)#ip ospf priority 0
R2(config-if)#end

Step 4: Shut down and re-enable the fastethernet0/0 interfaces to force an OSPF election
R1(config)# interface fastethernet 0/0
R1(config-if)# shutdown

R2
R2(config)# interface fastethernet 0/0
R2(config-if)# shutdown

R3
R3(config)# interface fastethernet 0/0
R3(config-if)# shutdown

Step 5: Re-enable the fastethernet 0/0 interface on the R2 router
R2(config-if)# no shut
R2(config-if)# end

Step 6: Re-enable the fastethernet 0/0 interface on the R1 router
R1(config-if)# no shut

Step 7: Use show ip ospf neighbor command on the R1 router to view the OSPF neighbor information for that router

R1# show ip ospf neighbor

Step 8: Re-enable the fastethernet 0/0 interface on the R3 router
R3(config-if)# no shutdown

Step 9: Use the show ip ospf interface command on the R3 router to verify that R3 has become BDR
R3# show ip ospf interface