bgp路由反射器实验
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BGP路由反射器实验
2009-09-04 09:15:43
标签：cisco路由bgp反射器
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BGP路由反射器实验报告
一、实验目的
配置IBGP路由器使用路由反射器和简单的路由过滤器
二、拓扑结构图
三、实验步骤
1.配置基本接口地址(略)
测试: sanjose3(config)#do ping 192.168.1.5
sanjose3(config)#do ping 172.24.1.18 通基本地址配置成功
2.配置内部IBGP协议采用rip
Sanjose3(config-if)#router rip
Sanjose3(config-router)#net 192.168.1.0
Sanjose3(config-router)#net 172.24.0.0
sanjose1(config-if)#router rip
sanjose1(config-router)#net 192.168.1.0
sanjose2(config-if)#router rip
sanjose2 (config-router)#net 172.24.0.0
3.配置bgp协议
sanjose3(config)#router bgp 100
sanjose3(config-router)#neigh 192.168.1.5 remote-as 100 sanjose3(config-router)#neigh 172.24.1.18 remote-as 100 sanjose3(config-router)#net 200.100.50.0
sanjose1(config)#router bgp 100
sanjose1(config-router)#neigh 192.168.1.6 remote-as 100
sanjose2(config)#router bgp 100
sanjose2(config-router)#neigh 172.24.1.17 remote-as 100 sanjose2(config-router)#net 199.9.9.0
查看结果:
sanjose2#sh ip bgp
Network Next Hop Metric LocPrf Weight Path *> 199.9.9.0 0.0.0.0 0 32768 i
r>i200.100.50.0 172.24.1.17 0 100 0 i
sanjose3#sh ip bgp
Network Next Hop Metric LocPrf Weight Path r>i199.9.9.0 172.24.1.18 0 100 0 i
sanjose1#sh ip bgp
Network Next Hop Metric LocPrf Weight Path r>i200.100.50.0 192.168.1.6 0 100 0 i
sanjose1#show ip route
R 200.100.50.0/24 [120/1] via 192.168.1.6, 00:00:11, Serial0/0 R 172.24.0.0/16 [120/1] via 192.168.1.6, 00:00:11, Serial0/0 192.168.1.0/30 is subnetted, 1 subnets
C 192.168.1.4 is directly connected, Serial0/0
问题:为什么在sanjose1上看不到哦啊199.9.9.0网络的bgp条目
原因:因为在一个自治系统内,由于水平分割的原则, 通过IBGP学习到的路径从来不会公告给其他IBGP
4.配置路由反射器打破水平分割
sanjose3(config)#router bgp 100
sanjose3(config-router)#neigh 192.168.1.5 route-reflector-client sanjose3(config-router)#neigh 172.24.1.18 route-reflector-client
sanjose1#sh ip bgp
Network Next Hop Metric LocPrf Weight Path *>i199.9.9.0 172.24.1.18 0 100 0 i
*>i200.100.50.0 192.168.1.6 0 100 0 i
sanjose1#sh ip route
B 199.9.9.0/24 [200/0] via 172.24.1.18, 00:00:52
B 200.100.50.0/24 [200/0] via 192.168.1.6, 00:01:48
R 172.24.0.0/16 [120/1] via 192.168.1.6, 00:00:14, Serial0/0
192.168.1.0/30 is subnetted, 1 subnets
C 192.168.1.4 is directly connected, Serial0/0
测试: sanjose1#ping 199.9.9.1通
sanjose3#sh ip pro
Routing Protocol is "bgp 100"
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Route Reflector for address family IPv4 Unicast, 2 clients
Route Reflector for address family VPNv4 Unicast, 2 clients
Route Reflector for address family IPv4 Multicast, 2 clients IGP synchronization is disabled
Automatic route summarization is disabled
Neighbor(s):
Address FiltIn FiltOut DistIn DistOut Weight RouteMap 172.24.1.18
192.168.1.5
Maximum path: 1
Routing Information Sources:
Gateway Distance Last Update
172.24.1.18 200 00:03:07
Distance: external 20 internal 200 local 200
5.配置汇总地址
sanjose2(config)#router bgp 100
sanjose2(config-router)#aggre
sanjose2(config-router)#aggregate-address 199.0.0.0 255.255.255.0