MSR3620双线接入如何自动切换

写两条不同优先级的路由，默认都是60，优先，同时做nqa检测

线路1：

track 1 int g1/0/1 

ip route 0.0.0.0 0 112.168.1.1 track 1

线路2：

ip route 0.0.0.0 0 112.168.2.1  pre 70

可以配置NQA检测来实现，以下是配置参考命令：

[SW2]nqa agent enable 

[SW2]nqa entry weijianing ninglihua

[SW2-nqa-weijianing-ninglihua]type icmp-echo

[SW2-nqa-weijianing-ninglihua-icmp-echo]source int GigabitEthernet 1/0/1

[SW2-nqa-weijianing-ninglihua-icmp-echo]destination ip 10.0.0.2

[SW2-nqa-weijianing-ninglihua-icmp-echo]frequency 100000

[SW2-nqa-weijianing-ninglihua-icmp-echo]probe timeout 30

[SW2-nqa-weijianing-ninglihua-icmp-echo]next-hop 10.0.0.2

[SW2-nqa-weijianing-ninglihua-icmp-echo] history-record enable

[SW2-nqa-weijianing-ninglihua-icmp-echo]history-record number 50

[SW2-nqa-weijianing-ninglihua-icmp-echo]probe count 10

[SW2-nqa-weijianing-ninglihua-icmp-echo]probe timeout 30

[SW2-nqa-weijianing-ninglihua-icmp-echo]reaction 1 checked-element probe-fail threshold-type consecutive 1 action-type trigger-only

[SW2-nqa-weijianing-ninglihua-icmp-echo]route-option bypass-route

[SW2]track 1 nqa entry weijianing ninglihua reaction 1

[SW2]nqa schedule weijianing ninglihua start-time now lifetime forever

然后将NQA与track绑定后再将track联动到路由。