策略路由应用实例：多链路负载均衡
R3#sh run //路由器R3的配置 
Building configuration...
……
interface Loopback0 //模拟一个连接目标
description to internet
ip address 100.100.100.100 255.255.255.0
!
interface Serial1/1 //模拟ISP1的接入端口
ip address 123.0.0.3 255.255.255.0
serial restart-delay 0
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