policy-based-route p1 permit node 1
if-match acl 2000
apply default-next-hop 1.1.1.1 /第一条专线的下一跳/
policy-based-route p1 permit node 2
if-match acl 2001
apply default-next-hop 2.1.1.1 /第二条专线的下一跳/
acl number 2000
rule 1 permit source 172.16.1.0 0.0.0.255
rule 100 deny
acl number 2001
rule 1 permit source 200.198.253.0 0.0.0.255
rule 2 deny interface
GigabitEthernet0/0
description link-lan
ip policy-based-route p1
1.一定要定义清楚各个安全域！
2.一定要懂得安全策略中的安全域和IP地址交集才有效！
对于MSR网关，可以使用策略路由和自动侦测实现负载分担和链路备份功能。同样以其中一条WAN连接地址为142.1.1.2/24，网关为142.1.1.1，另外一条WAN连接地址为162.1.1.2/24，网关为162.1.1.1，使用MSR2010做为网关设备为例，配置方法如下：
1、配置自动侦测组，对WAN连接状态进行侦测：
[H3C]nqa agent enable
[H3C]nqa entry wan1 1
[H3C-nqa-wan1-1]type icmp-echo
[H3C-nqa-wan1-1-icmp-echo]destination ip 142.1.1.1
[H3C-nqa-wan1-1-icmp-echo]next-hop 142.1.1.1
[H3C-nqa-wan1-1-icmp-echo]probe count 3
[H3C-nqa-wan1-1-icmp-echo]probe timeout 1000
[H3C-nqa-wan1-1-icmp-echo]frequency 10000
[H3C-nqa-wan1-1-icmp-echo]reaction 1 checked-element probe-fail threshold-type consecutive 6 action-type trigger-only
[H3C]nqa entry wan2 1
[H3C-nqa-wan2-1]type icmp-echo
[H3C-nqa-wan2-1-icmp-echo]destination ip 162.1.1.1
[H3C-nqa-wan2-1-icmp-echo]next-hop 162.1.1.1
[H3C-nqa-wan2-1-icmp-echo]frequency 10000
[H3C-nqa-wan2-1-icmp-echo]probe count 3
[H3C-nqa-wan2-1-icmp-echo]probe timeout 1000
[H3C-nqa-wan2-1-icmp-echo]reaction 1 checked-element probe-fail threshold-type consecutive 6 action-type trigger-only
[H3C]nqa schedule wan1 1 start-time now lifetime forever
[H3C]nqa schedule wan2 1 start-time now lifetime forever
[H3C]track 1 nqa entry wan1 1 reaction 1
[H3C]track 2 nqa entry wan2 1 reaction 1
2、配置默认路由，当任意WAN链路出现故障时，流量可以在另外一条链路上进行转发
[H3C]ip route-static 0.0.0.0 0.0.0.0 142.1.1.1 track 1 preference 60
[H3C]ip route-static 0.0.0.0 0.0.0.0 162.1.1.1 track 2 preference 100