利用BGP虚拟下一跳技术实现IP骨干网流量负载均衡..doc

配置 说明： 【R1】 interface Loopback0 ip address 192.168.0.1 255.255.255.255 interface Serial1/0 no sh ip address 172.16.15.1 255.255.255.0 interface Serial1/1 no sh ip address 172.16.12.1 255.255.255.0 interface Serial1/2 no sh ip address 172.16.16.1 255.255.255.0 interface Serial1/3 no sh ip address 172.16.13.1 255.255.255.0 ip route 10.0.0.1 255.255.255.255 172.16.13.3 【虚拟下一跳地址指向真正下一跳，并由本域内IGP(OSPF)路由引入，使本域内所有邻居都能学习到虚拟下一跳地址的路由，从而使邻居从自己学习到的路由能最优化】 ip route 192.168.0.3 255.255.255.255 172.16.13.3 ip prefix-list ISP-B seq 5 permit 172.16.34.0/24【做前缀列表匹配需要改变下一跳的前缀】 route-map set-nexthop permit 10 【做route-map，改相应前缀下一跳性】 match ip address prefix-list ISP-B set ip next-hop 10.0.0.1 route-map set-nexthop permit 20 router ospf 1 router-id 192.168.0.1 no auto-cost redistribute static metric 10 metric-type 1 subnets【引入静态路由，使域内所有IBGP邻居能学到虚拟下一跳地址，从面使邻居从自己学习到的路由能最优化】 network 172.16.12.0 0.0.0.255 area 0 network 172.16.15.0 0.0.0.255 area 0 network 172.16.16.0 0.0.0.255 area 0 network 192.168.0.0 0.0.0.255 area 0 router bgp 100 no synchronization bgp router-id 192.168.0.1 bgp log-neighbor-changes neighbor internal peer-group neighbor internal remote-as 100 neighbor internal update-source Loopback0 neighbor internal route-map set-nexthop out【做出方向的ruout-map改变发向邻居路由的下一跳】 neighbor 192.168.0.2 peer-group internal neighbor 192.168.0.3 remote-as 200 neighbor 192.168.0.3 ebgp-multihop 255 neighbor 192.168.0.3 update-source Loopback0 neighbor 192.168.0.3 soft-reconfiguration inbound neighbor 192.168.0.5 peer-group internal neighbor 192.168.0.6 peer-group internal no auto-summary 【R2】 interface Loopback0 ip address 192.168.0.2 255.255.255.255 interface Serial1/0 no sh ip address 172.16.26.2 255.255.255.0 interface Serial1/1 no sh ip address 172.16.12.2 255.255.255.0 interface Serial1/2 no sh ip address 172.16.25.2 255.255.255.0 interface Serial1/3 no sh ip address 172.16.24.2 255.255.255.0 ip route 10.0.0.1