Smart Link+Monitor Link组网

1.技术背景及原理

一般情况下，Smart Link只能感知与其接口直连的链路故障。将Monitor Link配置在Smart Link的上游设备上，可使Smart Link迅速感知上游链路故障，进行链路切换。Smart Link与Monitor Link配合使用，扩大了Smart Link的应用场景范围，使组网构建更为灵活。

2.实验拓扑

3.基础配置

[SW1]dis cu
#
sysname SW1
#
vlan batch 10 20 100
#
interface GigabitEthernet0/0/1
 port link-type trunk
 port trunk allow-pass vlan 10 20 100
#
interface GigabitEthernet0/0/2
 port link-type trunk
 port trunk allow-pass vlan 10 20 100
#
interface GigabitEthernet0/0/3
 port link-type access
 port default vlan 10
#
interface GigabitEthernet0/0/4
 port link-type access
 port default vlan 20
#

[SW2]dis cu
#
sysname SW2
#
vlan batch 10 20 100
#
interface GigabitEthernet0/0/1
 port link-type trunk
 port trunk allow-pass vlan 10 20 100
 stp disable
 smart-lin