利用BGP虚拟下一跳技术实现IP骨干网流量负载均衡
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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 10.0.0.1 255.255.255.255 172.16.24.4【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 192.168.0.4 255.255.255.255 172.16.24.4
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 192.168.0.2
log-adjacency-changes
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 172.16.25.0 0.0.0.255 area 0