实验：OSPF高级配置（二）路由汇总

接上篇 《实验：OSPF高级配置（一）连通性目标实现》 本片主要介绍OSPF地址汇总
在ABR（R2）和ASBR（R5）上实现路由汇总：
路由器关键配置：
R2:
R2(config)#router ospf 1
R2(config-router)#area 1 range 192.168.16.0 0.0.15.255 advertise

R5:
R5(config)#router ospf 1
R5(config-router)#summary-address 192.168.64.0 255.255.240.0
查看路由汇总会的路由表：
R1:
R1#sh 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

C    192.168.10.0/24 is directly connected, FastEthernet0/0
C    192.168.1.0/24 is directly connected, FastEthernet1/0
O E2 192.168.64.0/20 [110/20] via 192.168.1.2, 00:02:15, FastEthernet1/0
O IA 192.168.16.0/20 [110/2] via 192.168.10.2, 00:03:40, FastEthernet0/0

R2:
R2#sh 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

O    192.168.30.0/24 [110/2] via 192.168.17.2, 00:04:11, FastEthernet1/0
C    192.168.10.0/24 is directly connected, FastEthernet0/0
C    192.168.17.0/24 is directly connected, FastEthernet1/0
O    192.168.1.0/24 [110/2] via 192.168.10.1, 00:04:11, FastEthernet0/0
O E2 192.168.64.0/20 [110/20] via 192.168.10.1, 00:02:46, FastEthernet0/0
O    192.168.16.0/20 is a summary, 00:04:11, Null0

R4:
R4#sh 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

C    192.168.30.0/24 is directly connected, FastEthernet0/0
O IA 192.168.10.0/24 [110/3] via 192.168.30.1, 00:38:40, FastEthernet0/0
O    192.168.17.0/24 [110/2] via 192.168.30.1, 00:38:40, FastEthernet0/0
O IA 192.168.1.0/24 [110/4] via 192.168.30.1, 00:38:40, FastEthernet0/0
O E2 192.168.64.0/20 [110/20] via 192.168.30.1, 00:03:42, FastEthernet0/0

R5:
R5#sh 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

O    192.168.10.0/24 [110/2] via 192.168.1.1, 00:36:21, FastEthernet0/0
C    192.168.66.0/24 is directly connected, FastEthernet1/0
C    192.168.1.0/24 is directly connected, FastEthernet0/0
R    192.168.70.0/24 [120/1] via 192.168.66.2, 00:00:03, FastEthernet1/0
O    192.168.64.0/20 is a summary, 00:04:01, Null0
O IA 192.168.16.0/20 [110/3] via 192.168.1.1, 00:05:26, FastEthernet0/0

R6#sh 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

R    192.168.10.0/24 [120/3] via 192.168.66.1, 00:00:16, FastEthernet0/0
C    192.168.66.0/24 is directly connected, FastEthernet0/0
R    192.168.1.0/24 [120/3] via 192.168.66.1, 00:00:16, FastEthernet0/0
C    192.168.70.0/24 is directly connected, FastEthernet1/0
R    192.168.64.0/20 [120/3] via 192.168.66.1, 00:00:16, FastEthernet0/0
R    192.168.16.0/20 [120/3] via 192.168.66.1, 00:00:16, FastEthernet0/0