1.10配置RIP的单播更新
今天在回过头来做实验手册一的时候发现了一个问题发上来跟大家共享一下！
在1.10配置RIP的单播更新中曾经有人问题如果在广播和单播（neighbor）的情况下那种工作会优先？
我在实验1.10的基础做了一点改进，得出了结论是单播。
具体是这样的！
1、我在r2上加了一个环回
r2(config)#int loopback 0
r2(config-if)#ip address 192.1.2.2 255.255.255.0
r2(config-if)#router rip
r2(config-router)#network 192.1.1.0
2、启用neighbor以后在r2的s1接口上应用passive-interface serial 1
r2(config)#router rip
r2(config-router)#passive-interface serial 1
3、在r3看实验现象
在加入neighbor前启用passive-interface serial 1前r3的现象是：
r3#show ip route
Codes: C - connected, S - static, I - IGRP, 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, E - EGP
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 192.1.1.0/24 is directly connected, Serial0
R 148.1.0.0/16 [120/1] via 192.1.1.1, 00:00:18, Serial0
R 192.1.2.0/24 [120/2] via 192.1.1.1, 00:00:18, Serial0
在加入neighbor后启用passive-interface serial 1后r3的现象是（clear ip route *）：
r3#show ip route
Codes: C - connected, S - static, I - IGRP, 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, E - EGP
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 192.1.1.0/24 is directly connected, Serial0
R 148.1.0.0/16 [120/1] via 192.1.1.1, 00:00:12, Serial0
R 192.1.2.0/24 [120/2] via 192.1.1.1, 00:00:12, Serial0
4、结论是单播优先。
恳求指正！！！
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