In this article we will learn how to configure ospf routing protocol in a complex network.OSPF(Open Shortes Path First) Routing can be done on any router it is not a cisco proprietary.Since it is an open standard it will run on most of routers.OSPF uses SPF algorithm to provide a loop free topology.OSPF is also a classless protocol.OSPF is complex to configure and troubleshoot.Here we will learn ospf routing protocol configuration through an example lab.I am going to Create a topology.See below to design topology diagram in your cisco packet tracer.
OSPF routing Protocol configuration is slightly different from EIGRP and RIP.
Router(config)# router ospf process_ID
Router(config-router)# network IP_address wildcard_mask area area_value
Before configuring OSPF routing protocols on each routers,we need to assign ip address to each and every interface of routers,up the network,set clock rate on all DCE interface.
START CONFIGURING IP ADDRESS ON EACH ROUTERS STEP WISE:
— System Configuration Dialog —
Continue with configuration dialog? [yes/no]: no
Press RETURN to get started!
Router>enable Router#config t Enter configuration commands, one per line. End with CNTL/Z. Router(config)#hostname R1 R1(config)#int fa0/1 R1(config-if)#ip address 211.146.0.1 255.255.255.0 R1(config-if)#no shut
R1(config-if)#exit R1(config)#int fa0/0 R1(config-if)#ip address 211.146.1.1 255.255.255.0 R1(config-if)#no shut
--- System Configuration Dialog ---
Continue with configuration dialog? [yes/no]: no
Press RETURN to get started!
Router>enable Router#config t Enter configuration commands, one per line. End with CNTL/Z. Router(config)#hostname R2 R2(config)#int fa0/0 R2(config-if)#ip address 211.146.1.2 255.255.255.0 R2(config-if)#no shut
R2(config-if)#exit R2(config)#int se0/0/0 R2(config-if)#ip address 211.146.2.1 255.255.255.0 R2(config-if)#clock rate 64000 R2(config-if)#no shut
--- System Configuration Dialog ---
Continue with configuration dialog? [yes/no]: no
Press RETURN to get started!
Router>enable Router#config t Enter configuration commands, one per line. End with CNTL/Z. Router(config)#hostname R3 R3(config)#int se0/0/0 R3(config-if)#ip address 211.146.2.2 255.255.255.0 R3(config-if)#no shut
R3(config-if)#exit R3(config)#int se0/0/1 R3(config-if)#ip address 211.146.3.1 255.255.255.0 R3(config-if)#clock rate 64000 R3(config-if)#no shut
R3(config-if)#exit R3(config)#int fa0/0 R3(config-if)#ip address 211.146.5.1 255.255.255.0 R3(config-if)#no shut
--- System Configuration Dialog ---
Continue with configuration dialog? [yes/no]: no
Press RETURN to get started!
Router>enable Router#config t Enter configuration commands, one per line. End with CNTL/Z. Router(config)#hostname R4 R4(config)#int eth0/0/0 R4(config-if)#ip address 211.146.5.2 255.255.255.0 R4(config-if)#no shut
R4(config-if)#exit R4(config)#int fa0/1 R4(config-if)#ip address 211.146.6.1 255.255.255.0 R4(config-if)#no shut
--- System Configuration Dialog ---
Continue with configuration dialog? [yes/no]: no
Press RETURN to get started!
Router>enable Router#config t Enter configuration commands, one per line. End with CNTL/Z. Router(config)#hostname R5 R5(config)#int fa0/0 R5(config-if)#ip address 211.146.6.2 255.255.255.0 R5(config-if)#no shut
R5(config-if)#exit R5(config)#int eth0/0/0 R5(config-if)#ip address 211.146.7.2 255.255.255.0 R5(config-if)#no shut
--- System Configuration Dialog ---
Continue with configuration dialog? [yes/no]: no
Press RETURN to get started!
Router>enable Router#config t Enter configuration commands, one per line. End with CNTL/Z. Router(config)#hostname R6 R6(config)#int se0/0/0 R6(config-if)#ip address 211.146.3.2 255.255.255.0 R6(config-if)#no shut
R6(config-if)#exit R6(config)#int se0/0/1 R6(config-if)#ip address 211.146.4.1 255.255.255.0 R6(config-if)#clock rate 64000 R6(config-if)#no shut
R6(config-if)#exit R6(config)#int fa0/0 R6(config-if)#ip address 211.146.7.1 255.255.255.0 R6(config-if)#no shut
--- System Configuration Dialog ---
Continue with configuration dialog? [yes/no]: no
Press RETURN to get started!
Router>enable Router#config t Enter configuration commands, one per line. End with CNTL/Z. Router(config)#hostname R7 R7(config)#int se0/0/0 R7(config-if)#ip address 211.146.4.2 255.255.255.0 R7(config-if)#no shut
R7(config-if)#exit R7(config)#int fa0/0 R7(config-if)#ip address 211.146.8.1 255.255.255.0 R7(config-if)#no shut
--- System Configuration Dialog ---
Continue with configuration dialog? [yes/no]: no
Press RETURN to get started!
Router>enable Router#config t Enter configuration commands, one per line. End with CNTL/Z. Router(config)#hostname R8 R8(config)#int fa0/0 R8(config-if)#ip address 211.146.8.2 255.255.255.0 R8(config-if)#no shut
R8(config-if)#exit R8(config)#int fa0/1 R8(config-if)#ip address 211.146.9.1 255.255.255.0 R8(config-if)#no shut
Configure and Enable OSPF Routing Protocol on ROUTER R1:
R1(config)#router ospf 1 R1(config-router)#network 211.146.0.0 0.0.0.255 area 0 R1(config-router)#network 211.146.1.0 0.0.0.255 area 0 R1(config-router)#exit
Configure and Enable OSPF Routing Protocol on ROUTER R2:
R2(config)#router ospf 2
R2(config-router)#network 211.146.1.0 0.0.0.255 area 0 23:07:45: %OSPF-5-ADJCHG: Process 2, Nbr 211.146.1.1 on FastEthernet0/0 from LOADING to FULL, Loading Done R2(config-router)#network 211.146.2.0 0.0.0.255 area 0 R2(config-router)#exit
Configure and Enable OSPF Routing Protocol on ROUTER R3:
R3(config)#router ospf 3
R3(config-router)#network 211.146.2.0 0.0.0.255 area 0 R3(config-router)# 23:08:38: %OSPF-5-ADJCHG: Process 3, Nbr 211.146.2.1 on Serial0/0/0 from LOADING to FULL, Loading Done R3(config-router)#network 211.146.3.0 0.0.0.255 area 0 R3(config-router)#network 211.146.5.0 0.0.0.255 area 0 R3(config-router)#exit
Configure and Enable OSPF Routing Protocol on ROUTER R4:
R4(config)#router ospf 4
R4(config-router)#network 211.146.5.0 0.0.0.255 area 0 R4(config-router)# 23:12:08: %OSPF-5-ADJCHG: Process 4, Nbr 211.146.5.1 on Ethernet0/0/0 from LOADING to FULL, Loading Done R4(config-router)#network 211.146.6.0 0.0.0.255 area 0 R4(config-router)#exit
Configure and Enable OSPF Routing Protocol on ROUTER R5:
R5(config)#router ospf 5
R5(config-router)#network 211.146.6.0 0.0.0.255 area 0 R5(config-router)# 23:13:30: %OSPF-5-ADJCHG: Process 5, Nbr 211.146.6.1 on FastEthernet0/0 from LOADING to FULL, Loading Done R5(config-router)#network 211.146.7.0 0.0.0.255 area 0 R5(config-router)#exit
Configure and Enable OSPF Routing Protocol on ROUTER R6:
R6(config)#router ospf 6
R6(config-router)#network 211.146.3.0 0.0.0.255 area 0 R6(config-router)# 23:15:37: %OSPF-5-ADJCHG: Process 6, Nbr 211.146.5.1 on Serial0/0/0 from LOADING to FULL, Loading Done R6(config-router)#network 211.146.7.0 0.0.0.255 area 0 R6(config-router)# 23:16:00: %OSPF-5-ADJCHG: Process 6, Nbr 211.146.7.2 on FastEthernet0/0 from LOADING to FULL, Loading Done R6(config-router)#network 211.146.4.0 0.0.0.255 area 0 R6(config-router)#exit
Configure and Enable OSPF Routing Protocol on ROUTER R7:
R7(config)#router ospf 7
R7(config-router)#network 211.146.4.0 0.0.0.255 area 0 R7(config-router)# 23:21:54: %OSPF-5-ADJCHG: Process 7, Nbr 211.146.7.1 on Serial0/0/0 from LOADING to FULL, Loading Done R7(config-router)#network 211.146.8.0 0.0.0.255 area 0 R7(config-router)#exit
Configure and Enable OSPF Routing Protocol on ROUTER R8:
R8(config)#router ospf 8
R8(config-router)#network 211.146.8.0 0.0.0.255 area 0 R8(config-router)# 23:25:51: %OSPF-5-ADJCHG: Process 8, Nbr 211.146.8.1 on FastEthernet0/0 from LOADING to FULL, Loading Done R8(config-router)#network 211.146.9.0 0.0.0.255 area 0 R8(config-router)#exit
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[…] article we will learn to troubleshoot OSPF routing protocols.In previous article we have learnt how to configure ospf routing protocol.And now in this section we will learn how to troubleshoot ospf routing protocol and to do so we […]
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[…] article we will learn to troubleshoot OSPF routing protocols.In previous article we have learnt how to configure ospf routing protocol.And now in this section we will learn how to troubleshoot ospf routing protocol and to do so we […]
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