TCP/IP路由技术5.8节第5题困惑

荣少

按照实验拓扑，为什么R1的路由表会有32位的路由,(GNS模拟)

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

     192.168.20.0/24 is variably subnetted, 5 subnets, 2 masks
C       192.168.20.64/27 is directly connected, Loopback1
R       192.168.20.48/32 [120/1] via 192.168.20.34, 00:00:22, Ethernet0/0
R       192.168.20.40/32 [120/1] via 192.168.20.34, 00:00:22, Ethernet0/0     应该合并成27位，谁能解释下？
C       192.168.20.32/27 is directly connected, Ethernet0/0
C       192.168.20.128/27 is directly connected, Loopback0
R1#

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

     192.168.20.0/29 is subnetted, 5 subnets
R       192.168.20.64 [120/1] via 192.168.20.33, 00:00:12, Ethernet0/0
C       192.168.20.48 is directly connected, Loopback0
C       192.168.20.40 is directly connected, Loopback1
C       192.168.20.32 is directly connected, Ethernet0/0
R       192.168.20.128 [120/1] via 192.168.20.33, 00:00:12, Ethernet0/0
R2#

84983251

给你看看我的笔记吧
看不懂可以提问

xiaok-cisco

换回地址的原因

wangshuai_ws

这是环回口的问题  环回口默认生成32位路由   如果运用OSPF的话 可以在环回端口下使用 ip ospf network point-to-point 命令取消32位路由 RIP的话  这个问题我没试验过 不过还是希望能帮助到你。