Building OSPF network with EVE-NG (2)

 

<First OSPF Topology>

all OPSF nodes are in a specific 'area'. Area 0 is a backbone area. the backbone area is responsible for distributing routing information between non-backbone areas. if you have Area more than one, you should have backbone area.

the backbone area should be 0 or 0.0.0.0 (0.0.0.0 is same with 0).

you can use the decimal number or IP address format for Area number.

 

 

<Configuration>

R1(config)#router ospf 1       // this command makes you going into OSPF configuration mode.                                        // the number is Process-ID which identifying a ospf process in several ospf processes                                        // it means that a router can run several ospf processes. this process id affects one router. R1(config-router)#router-id 1.1.1.1                       // this id defines router's unique id among routers running OSPF                                                                    // by this, routers know who advertise route information R1(config-router)#network 1.1.1.1 0.0.0.0 area 1     // 1.1.1.1 only will be in area 1 R1(config-router)#network 1.1.123.1 0.0.0.0 area 1  // 1.1.123.1 only will be in area 1 R5(config-router)#network 1.1.1.1 0.0.0.0 area ?   <0-4294967295>  OSPF area ID as a decimal value   A.B.C.D         OSPF area ID in IP address format

R2(config)#router ospf 1 R2(config-router)#router-id 1.1.2.2 R2(config-router)#network 1.1.2.2 0.0.0.0 area 0 R2(config-router)#network 1.1.123.2 0.0.0.0 area 1 R2(config-router)#network 1.1.24.2 0.0.0.0 area 0

R3(config)#router ospf 1 R3(config-router)#router-id R3(config-router)#router-id 1.1.3.3 R3(config-router)#network 1.1.3.3 0.0.0.0 area 0 R3(config-router)#network 1.1.123.3 0.0.0.0 area 1 R3(config-router)#network 1.1.34.3 0.0.0.0 area 0

R4(config)#router ospf 1 R4(config-router)#router-id 1.1.4.4 R4(config-router)#network 1.1.4.4 0.0.0.0 area 0 R4(config-router)#network 1.1.24.4 0.0.0.0 area 0 R4(config-router)#network 1.1.34.4 0.0.0.0 area 0 R4(config-router)#network 1.1.45.4 0.0.0.0 area 45

R5(config)#router ospf 1 R5(config-router)#router R5(config-router)#router-id 1.1.5.5 R5(config-router)#network 1.1.5.5 0.0.0.0 area 45 R5(config-router)#network 1.1.45.5 0.0.0.0 area 45

R5#ping 1.1.1.1 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 1.1.1.1, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 2/2/2 ms

R1#show ip route ospf Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP        D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area        N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2        E1 - OSPF external type 1, E2 - OSPF external type 2        i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2        ia - IS-IS inter area, * - candidate default, U - per-user static route        o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP        a - application route        + - replicated route, % - next hop override Gateway of last resort is not set       1.0.0.0/8 is variably subnetted, 10 subnets, 2 masks O IA     1.1.2.2/32 [110/11] via 1.1.123.2, 12:40:08, Ethernet0/0.123   // loopback interface is set by /32 O IA     1.1.3.3/32 [110/11] via 1.1.123.3, 00:20:37, Ethernet0/0.123 O IA     1.1.4.4/32 [110/21] via 1.1.123.2, 00:17:45, Ethernet0/0.123 O IA     1.1.5.5/32 [110/31] via 1.1.123.2, 00:01:01, Ethernet0/0.123 O IA     1.1.24.0/24 [110/20] via 1.1.123.2, 12:39:35, Ethernet0/0.123 O IA     1.1.34.0/24 [110/74] via 1.1.123.3, 00:20:18, Ethernet0/0.123 O IA     1.1.45.0/24 [110/30] via 1.1.123.2, 00:17:13, Ethernet0/0.123

 

If you want to advertise the subnet mask that loopback is having, not /32, you need to command 'ip opsf network point-to-point' in the interface.

R1(config)#int lo 0 R1(config-if)#ip ospf network point-to-point

R5#show ip route ospf Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP        D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area        N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2        E1 - OSPF external type 1, E2 - OSPF external type 2        i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2        ia - IS-IS inter area, * - candidate default, U - per-user static route        o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP        a - application route        + - replicated route, % - next hop override Gateway of last resort is not set       1.0.0.0/8 is variably subnetted, 11 subnets, 2 masks O IA     1.1.1.0/24 [110/31] via 1.1.45.4, 00:02:03, Ethernet0/0.45 O IA     1.1.2.2/32 [110/21] via 1.1.45.4, 00:19:09, Ethernet0/0.45 O IA     1.1.3.3/32 [110/75] via 1.1.45.4, 00:19:09, Ethernet0/0.45 O IA     1.1.4.4/32 [110/11] via 1.1.45.4, 00:19:09, Ethernet0/0.45 O IA     1.1.24.0/24 [110/20] via 1.1.45.4, 00:19:09, Ethernet0/0.45 O IA     1.1.34.0/24 [110/74] via 1.1.45.4, 00:19:09, Ethernet0/0.45 O IA     1.1.123.0/24 [110/30] via 1.1.45.4, 00:19:09, Ethernet0/0.45

 

 

<Ping test>

R1#ping 1.1.2.2 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 1.1.2.2, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/1 ms

R1#ping 1.1.3.3 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 1.1.3.3, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/1 ms

R1#ping 1.1.4.4 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 1.1.4.4, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/2 ms

R1#ping 1.1.5.5 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 1.1.5.5, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/3 ms

 

The best way to study network is to hands-on.

- Peter Jeon