OSPF区域间路由汇总

拓扑图

 

实验过程

1.       R1的预配置

Router>en Router#config t Enter configuration commands, one per line.  End with CNTL/Z. Router(config)#no ip domain-lookup Router(config)#line console 0 Router(config-line)#no exec-timeout Router(config-line)#loggin syn Router(config-line)#exit Router(config)#host  R1 R1(config)#int lo0 R1(config-if)#ip add 10.1.1.1 255.255.255.0 R1(config-if)#int lo1 R1(config-if)#ip add 10.1.2.1 255.255.255.0 R1(config-if)#int s0/0 R1(config-if)#no shut R1(config-if)#ip add 192.168.1.1 255.255.255.252 R1(config-if)#exit

2.       R2的预配置

Router>en Router#config t Enter configuration commands, one per line.  End with CNTL/Z. Router(config)#no ip domain-lookup Router(config)#line console 0 Router(config-line)#no exec-timeout Router(config-line)#loggin syn Router(config-line)#exit Router(config)#host  R2 R2(config)#int s0/0 R2(config-if)#no shut R2(config-if)#ip add 192.168.1.2 255.255.255.252 R2(config-if)#int s0/1 R2(config-if)#no shut R2(config-if)#ip add 192.168.1.5 255.255.255.252 R2(config-if)#exit

3.       R3的预配置

Router>en Router#config t Enter configuration commands, one per line.  End with CNTL/Z. Router(config)#no ip domain-lookup Router(config)#line console 0 Router(config-line)#no exec-timeout Router(config-line)#loggin syn Router(config-line)#exit Router(config)#host  R3 R3(config)#int s0/1 R3(config-if)#no shut R3(config-if)#ip add 192.168.1.6 255.255.255.252 R3(config-if)#int s0/2 R3(config-if)#no shut R3(config-if)#ip add 192.168.1.9 255.255.255.252 R3(config-if)#exit

4.       R4的预配置

Router>en Router#config t Enter configuration commands, one per line.  End with CNTL/Z. Router(config)#no ip domain-lookup Router(config)#line console 0 Router(config-line)#no exec-timeout Router(config-line)#loggin syn Router(config-line)#exit Router(config)#host  R4 R4(config)#int s0/2 R4(config-if)#no shut R4(config-if)#ip add 192.168.1.10 255.255.255.252 R4(config-if)#int lo0 R4(config-if)#ip add 172.16.1.1 255.255.255.0 R4(config-if)#int lo1 R4(config-if)#ip add 172.16.2.1 255.255.255.0 R4(config-if)#exit

5.       R1的OSPF配置

R1(config)#router ospf 1 R1(config-router)#router-id 1.1.1.1 R1(config-router)#net 192.168.1.1 0.0.0.0 area 1 R1(config-router)#net 10.1.1.1 0.0.0.0 area 1 R1(config-router)#net 10.1.2.1 0.0.0.0 area 1 R1(config-router)#end

 

6.       R2的OSPF配置

R2(config)#router ospf 1 R2(config-router)#router-id 2.2.2.2 R2(config-router)#net 192.168.1.2 0.0.0.0 area 1 R2(config-router)#net 192.168.1.5 0.0.0.0 area 0 R2(config-router)#end

7.       R3的OSPF配置

R3(config)#router ospf 1 R3(config-router)#router-id 3.3.3.3 R3(config-router)#net 192.168.1.6 0.0.0.0 area 0 R3(config-router)#net 192.168.1.9 0.0.0.0 area 2 R3(config-router)#end

8.       R4的OSPF配置

R4(config)#router ospf 1 R4(config-router)#router-id 4.4.4.4 Reload or use "clear ip ospf process" command, for this to take effect R4(config-router)#net 192.168.1.10 0.0.0.0 area 2 R4(config-router)#net 172.16.1.1 0.0.0.0 area 2 R4(config-router)#net 172.16.2.1 0.0.0.0 area 2 R4(config-router)#end

9.       查看R2和R3的邻居表

R2#show ip ospf nei   Neighbor ID     Pri   State           Dead Time   Address         Interface 3.3.3.3           0   FULL/  -        00:00:37    192.168.1.6     Serial0/1 1.1.1.1           0   FULL/  -        00:00:31    192.168.1.1     Serial0/0 R3#show ip ospf nei   Neighbor ID     Pri   State           Dead Time   Address         Interface 2.2.2.2           0   FULL/  -        00:00:30    192.168.1.5     Serial0/1 4.4.4.4           0   FULL/  -        00:00:30    192.168.1.10    Serial0/2

10.   查看R2的链路状态数据库

R2#show ip ospf da               OSPF Router with ID (2.2.2.2) (Process ID 1)                   Router Link States (Area 0)  //LSA 1   Link ID         ADV Router      Age         Seq#       Checksum Link count 2.2.2.2         2.2.2.2         156         0x80000006 0x002B7C 2 3.3.3.3         3.3.3.3         762         0x80000005 0x00CCD6 2                   Summary Net Link States (Area 0)  //LSA 3   Link ID         ADV Router      Age         Seq#       Checksum 10.1.1.1        2.2.2.2         152         0x80000001 0x0036B0 10.1.2.1        2.2.2.2         152         0x80000001 0x002BBA 172.16.1.1      3.3.3.3         757         0x80000001 0x002110 172.16.2.1      3.3.3.3         757         0x80000001 0x00161A 192.168.1.0     2.2.2.2         152         0x80000001 0x00018C 192.168.1.8     3.3.3.3         757         0x80000001 0x0092EE                   Router Link States (Area 1)  //LSA 1   Link ID         ADV Router      Age         Seq#       Checksum Link count 1.1.1.1         1.1.1.1         157         0x80000003 0x000C76 4 2.2.2.2         2.2.2.2         156         0x80000001 0x006E4D 2                   Summary Net Link States (Area 1)  //LSA 3   Link ID         ADV Router      Age         Seq#       Checksum 172.16.1.1      2.2.2.2         158         0x80000001 0x00C133 172.16.2.1      2.2.2.2         158         0x80000001 0x00B63D 192.168.1.4     2.2.2.2         158         0x80000001 0x00D8B0 192.168.1.8    2.2.2.2         158         0x80000001 0x003312

11.   查看R4的路由表

R4#show ip route Codes: 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   Gateway of last resort is not set        172.16.0.0/24 is subnetted, 2 subnets C       172.16.1.0 is directly connected, Loopback0 C       172.16.2.0 is directly connected, Loopback1      10.0.0.0/32 is subnetted, 2 subnets O IA    10.1.2.1 [110/193] via 192.168.1.9, 00:14:14, Serial0/2 O IA    10.1.1.1 [110/193] via 192.168.1.9, 00:14:14, Serial0/2      192.168.1.0/30 is subnetted, 3 subnets C       192.168.1.8 is directly connected, Serial0/2 O IA    192.168.1.0 [110/192] via 192.168.1.9, 00:14:14, Serial0/2 O IA    192.168.1.4 [110/128] via 192.168.1.9, 00:14:14, Serial0/2

R4从R1学到的不是汇总的路由，OSPF默认不对路由进行汇总。

 

12.   测试连通性

R1#ping 172.16.1.1 source lo0      Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 172.16.1.1, timeout is 2 seconds: Packet sent with a source address of 10.1.1.1 !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 12/67/108 ms R1#ping 172.16.1.1 source lo1   Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 172.16.1.1, timeout is 2 seconds: Packet sent with a source address of 10.1.2.1 !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 28/56/124 ms

13.   在R2上做区域间路由汇总

R2(config)#router ospf 1 R2(config-router)#area 1 range 10.1.0.0 255.255.252.0  //区域间汇总在ABR上配置 R2(config-router)#end

14.   再次测试连通性

R4#ping 10.1.1.1   Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 10.1.1.1, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 48/57/76 ms R4#ping 10.1.2.1   Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 10.1.2.1, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 44/84/104 ms