详细解析配置BGP负载共享

　　该场景展示如何在多条（最大可有6条）等价链路上完成负载共享。该链路建立在本地AS中一台路由器和远程AS中另一台路由器之间是一个单宿主末端网络 BGP环境。

　　配置如下：

RouterA

RA(config)#int s1/1 RA(config-if)#ip add 150.10.10.1 255.255.255.0 RA(config-if)#no sh RA(config-if)#int s1/2 RA(config-if)#ip add 160.20.20.1 255.255.255.0 RA(config-if)#no sh RA(config-if)#int lo0 RA(config-if)#ip add 1.1.1.1 255.255.255.0 RA(config)#router bgp 11 RA(config-router)#nei 2.2.2.2 remote-as 10 RA(config-router)#nei 2.2.2.2 update-source lo0 RA(config-router)#nei 2.2.2.2 ebgp-multihop RA(config-router)#router eigrp 12 RA(config-router)#net 1.0.0.0 RA(config-router)#net 150.10.0.0 RA(config-router)#net 160.20.0.0 RA(config-router)#no auto-summary

RouterB

RB(config)#int lo0 RB(config-if)#ip add 2.2.2.2 255.255.255.0 RB(config-if)#int s1/1 RB(config-if)#no ip route-cache RB(config-if)#ip add 160.20.20.2 255.255.255.0 RB(config-if)#no sh RB(config-if)#int s1/2 RB(config-if)#no ip route-cache RB(config-if)#ip add 150.10.10.2 255.255.255.0 RB(config-if)#no sh RB(config-if)#router bgp 10 RB(config-router)#nei 1.1.1.1 remote-as 11 RB(config-router)#nei 1.1.1.1 update-source lo0 RB(config-router)#nei 1.1.1.1 ebgp-multihop RB(config-router)#router eigrp 12 RB(config-router)#net 2.0.0.0 RB(config-router)#net 150.10.0.0 RB(config-router)#net 160.20.0.0 RB(config-router)#no auto-summary

　　验证基于数据包（过程交换）的负载均衡：

RA#sh ip ro Gateway of last resort is not set 1.0.0.0/24 is subnetted, 1 subnets C 1.1.1.0 is directly connected, Loopback0 2.0.0.0/24 is subnetted, 1 subnets D 2.2.2.0 [90/2297856] via 150.10.10.2, 00:18:47, Serial1/1 [90/2297856] via 160.20.20.2, 00:18:47, Serial1/2 160.20.0.0/24 is subnetted, 1 subnets C 160.20.20.0 is directly connected, Serial1/2 150.10.0.0/24 is subnetted, 1 subnets C 150.10.10.0 is directly connected, Serial1/1 RA#traceroute 2.2.2.2 Type escape sequence to abort. Tracing the route to 2.2.2.2 1 150.10.10.2 36 msec 160.20.20.2 60 msec *