试验七：发布bgp子网信息
R1,
R1(config)#int fa0/0
R1(config-if)#ip addr 172.16.10.1 255.255.255.0
R1(config-if)#no shut
R1(config-router)#router rip
R1(config-router)#net 172.16.0.0
R1(config-router)#exit
R1上测试：
R1#show ip ro
*Apr 22 16:24:47.115: %SYS-5-CONFIG_I: Configured from console by console
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 202.110.100.0/24 is directly connected, Serial1/0
R 202.110.101.0/24 [120/1] via 202.110.100.2, 00:00:01, Serial1/0
C 192.168.10.0/24 is directly connected, Loopback0
172.16.0.0/24 is subnetted, 1 subnets //子网信息
C 172.16.10.0 is directly connected, FastEthernet0/0
R1#
R2上测试：
R2#show ip ro
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 202.110.100.0/24 is directly connected, Serial1/0
C 202.110.101.0/24 is directly connected, Serial1/1
R 192.168.10.0/24 [120/1] via 202.110.100.1, 00:00:17, Serial1/0
R 172.16.0.0/16 [120/1] via 202.110.100.1, 00:00:09, Serial1/0
结论：R2学习不到子网信息。
到这里并没有实现本试验的目的，既然R2学习不到子网信息，那么我们采用什么方法将子网发布出去呢？下面介绍bgp环境下发布子网信息。
语法：
（config-router）#no auto-summary 关闭自动汇总
（config-router）#network 子网号 mask 掩码
在R1上发布子网信息：
R1(config)#router bgp 64500
R1(config-router)#no auto-summary
R1(config-router)#network 172.16.10.0 mask 255.255.255.0
R1(config-router)#exit
在R2上测试，
C 202.110.100.0/24 is directly connected, Serial1/0
C 202.110.101.0/24 is directly connected, Serial1/1
R 192.168.10.0/24 [120/1] via 202.110.100.1, 00:00:06, Serial1/0
R 172.16.0.0/16 [120/1] via 202.110.100.1, 00:00:06, Serial1/0
和上面的试验结果一样，也就是发布子网的效果没有，这是不正常的，正常情况应该是发布子网后R2应该能够学到子网的信息，所以要尝试去排错，在做每个试验前要实现什么效果，如果理论没错的话学会排错很重要。我想了好长时间，终于，哦，原来R2和R1还不是邻居关系，所以马上建立邻居吧。
R2(config)#router bgp 64500
R2(config-router)#neighbor 202.110.100.1 remote-as 64500
R2(config-router)#net 202.110.100.0
R2(config-router)#net 202.110.101.0
R2(config-router)#exit
R2(config)#exit
再次在R2上测试：
C 202.110.100.0/24 is directly connected, Serial1/0
C 202.110.101.0/24 is directly connected, Serial1/1
R 192.168.10.0/24 [120/1] via 202.110.100.1, 00:00:07, Serial1/0
172.16.0.0/16 is variably subnetted, 2 subnets, 2 masks
B 172.16.10.0/24 [200/0] via 202.110.100.1, 00:00:06
R 172.16.0.0/16 [120/1] via 202.110.100.1, 00:00:07, Serial1/0
R2#
故障真的在这里，这样的话今天的问题解决了，还算顺利吧！！！
