NP-OSPF综合实验配置（二）
4.
配置路由总结减少路由表大小
OSPF
路由汇总只能在ABR
或ASBR
上进行
（
1
）在
R2
上对区域
1
路由进行汇总
r2(config-router)#router ospf 1
r2(config-router)#area 1 range 172.16.0.0 255.255.252.0
（
2
）在
R3
上对区域
4
路由进行汇总
r3(config-line)#router os 1
r3(config-router)#area 4 range 172.19.0.0 255.255.254.0
（
3
）在
R4
上对区域
2
路由进行汇总
r4(config)#router os 1
r4(config-router)#area 2 range 172.18.0.0 255.255.254.0
（
4
）在
R7
上对区域
3
路由进行汇总
r7(config)#router os 1
r7(config-router)#area 3 range 172.20.0.0 255.255.252.0
这里来看看当配置了
virtual-link R1
的路由表
r1#sh ip rou
172.17.0.0/32 is subnetted, 3 subnets
O IA 172.17.1.1 [110/64] vi a 10.1.1 .2, 00:00:01, Serial1/1
O IA 172.17.1.2 [110/128] vi a 10.1.1 .2, 00:00:01, Serial1/1
O IA 172.17.1.3 [110/128] vi a 10.1.1 .2, 00:00:01, Serial1/1
172.16.0.0/24 is subnetted, 4 subnets
C 172.16.0.0 is directly connected, Loopback0
C 172.16.1.0 is directly connected, Loopback1
C 172.16.2.0 is directly connected, Loopback2
C 172.16.3.0 is directly connected, Loopback3
172.19.0.0/23 is subnetted, 1 subnets
O IA 172.19.0.0 [110/193] vi a 10.1.1 .2, 00:00:01, Serial1/1
172.18.0.0/16 is variably subnetted, 3 subnets, 2 masks
O IA 172.18.0.0/24 [110/193] vi a 10.1.1 .2, 00:00:01, Serial1/1
O IA 172.18.0.0/23 [110/193] vi a 10.1.1 .2, 00:00:02, Serial1/1
O IA 172.18.1.0/24 [110/193] vi a 10.1.1 .2, 00:00:02, Serial1/1
172.20.0.0/22 is subnetted, 1 subnets
O IA 172.20.0.0 [110/257] vi a 10.1.1 .2, 00:00:02, Serial1/1
10.0.0 .0/24 is subnetted, 4 subnets
O IA 10.1.3 .0 [110/192] vi a 10.1.1 .2, 00:00:02, Serial1/1
O IA 10.1.2 .0 [110/192] vi a 10.1.1 .2, 00:00:02, Serial1/1
C 10.1.1 .0 is directly connected, Serial1/1
O IA 10.1.4 .0 [110/256] vi a 10.1.1 .2, 00:00:02, Serial1/1
可以看到，来自区域
2
的路由信息是没有被汇总。
将RIPV2
网络的路由信息重分布到OSPF
网络，同时进行对外部网络的汇总，再在R6
上配置一条默认路由到达其它网络
r5(config)#router ospf 1
r5(config-router)#redistribute rip subnets
r5(config-router)#summary-address 192.168.0.0 255.255.252.0
r6(config)#ip route 0.0.0 .0 0.0.0.0 192.168.255.1
查看
R1
的路由表
r1#sh ip rou
172.17.0.0/32 is subnetted, 3 subnets
O IA 172.17.1.1 [110/64] vi a 10.1.1 .2, 00:11:10, Serial1/1
O IA 172.17.1.2 [110/128] vi a 10.1.1 .2, 00:11:10, Serial1/1
O IA 172.17.1.3 [110/128] vi a 10.1.1 .2, 00:11:10, Serial1/1
172.16.0.0/24 is subnetted, 4 subnets
C 172.16.0.0 is directly connected, Loopback0
C 172.16.1.0 is directly connected, Loopback1
C 172.16.2.0 is directly connected, Loopback2
C 172.16.3.0 is directly connected, Loopback3
172.19.0.0/23 is subnetted, 1 subnets
O IA 172.19.0.0 [110/193] vi a 10.1.1 .2, 00:11:10, Serial1/1
172.18.0.0/16 is variably subnetted, 3 subnets, 2 masks
O IA 172.18.0.0/24 [110/193] vi a 10.1.1 .2, 00:11:10, Serial1/1
O IA 172.18.0.0/23 [110/193] vi a 10.1.1 .2, 00:11:11, Serial1/1
O IA 172.18.1.0/24 [110/193] vi a 10.1.1 .2, 00:11:11, Serial1/1
172.20.0.0/22 is subnetted, 1 subnets
O IA 172.20.0.0 [110/257] vi a 10.1.1 .2, 00:11:11, Serial1/1
10.0.0 .0/24 is subnetted, 4 subnets
O IA 10.1.3 .0 [110/192] vi a 10.1.1 .2, 00:11:11, Serial1/1
O IA 10.1.2 .0 [110/192] vi a 10.1.1 .2, 00:11:11, Serial1/1
C 10.1.1 .0 is directly connected, Serial1/1
O IA 10.1.4 .0 [110/256] vi a 10.1.1 .2, 00:11:11, Serial1/1
O E2 192.168.255.0/24 [110/20] vi a 10.1.1 .2, 00:01:28, Serial1/1
O E2 192.168.0.0/22 [110/20] vi a 10.1.1 .2, 00:00:15, Serial1/1
5.
采用合适的区域类型抑制LSA
的泛洪
通过观察拓扑图，区域1
可以配置为totally stub
区域4
配置为totally NSSA
区域
由于区域3
是通过virtual-link
和主干区域相连的，所以不能配置为末节区域。
因为区域2
是提供virtual-link
的链接，因此也不能配置为末节区域。
区域
1
：
r2(config)#router os 1
r2(config-router)#area 1 stub no-summary
r1(config)#router os 1
r1(config-router)#area 1 stub
区域
4
：
r3(config)#router os 1
r3(config-router)#area 4 nssa no-summary
r5(config)#router os 1
r5(config-router)#area 4 nssa
查看
R1
和
R5
的路由表
r1#sh ip rou
172.16.0.0/24 is subnetted, 4 subnets
C 172.16.0.0 is directly connected, Loopback0
C 172.16.1.0 is directly connected, Loopback1
C 172.16.2.0 is directly connected, Loopback2
C 172.16.3.0 is directly connected, Loopback3
10.0.0 .0/24 is subnetted, 1 subnets
C 10.1.1 .0 is directly connected, Serial1/1
O*I A 0.0.0 .0/0 [110/65] vi a 10.1.1 .2, 00:00:08, Serial1/1
r5#sh ip ro
172.19.0.0/24 is subnetted, 2 subnets
C 172.19.1.0 is directly connected, Loopback1
C 172.19.0.0 is directly connected, Loopback0
10.0.0 .0/24 is subnetted, 1 subnets
C 10.1.2 .0 is directly connected, Serial1/0
C 192.168.255.0/24 is directly connected, Serial1/1
R 192.168.0.0/24 [120/1] via 192.168.255.2, 00:00:07, Serial1/1
R 192.168.1.0/24 [120/1] via 192.168.255.2, 00:00:07, Serial1/1
R 192.168.2.0/24 [120/1] via 192.168.255.2, 00:00:07, Serial1/1
R 192.168.3.0/24 [120/1] via 192.168.255.2, 00:00:07, Serial1/1
O*I A 0.0.0 .0/0 [110/65] vi a 10.1.2 .1, 00:00:29, Serial1/0
l
192.168.0.0/22 is a summary, 00:00:38, Null0
6.
测试网络的联通性
r1#ping 192.168.255.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.255.2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 268/305/356 ms
r1#ping 192.168.0.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.0.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 280/344/400 ms
r1#ping 172.20.0.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.20.0.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 224/344/428 ms
r1#ping 172.18.0.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.18.0.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 188/228/284 ms
r1#ping 172.19.0.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.19.0.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 216/253/296 ms
r8#ping 192.168.0.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.0.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 264/336/372 ms
OK
，实验基本完成