1. 配置LSW1和LSW2的直连接口IP地址
[LSW1]vlan 10
[LSW1-GigabitEthernet0/0/3]port link-type hybrid
[LSW1-GigabitEthernet0/0/3]port hybrid pvid vlan 10
[LSW1-GigabitEthernet0/0/3]port hybrid untagged vlan 10
[LSW1]int Vlanif 10
[LSW1-Vlanif10]ip add 10.1.1.1 24
[LSW2]vlan batch 10
[LSW2-GigabitEthernet0/0/4]port link-type hybrid
[LSW2-GigabitEthernet0/0/4]port hybrid pvid vlan 10
[LSW2-GigabitEthernet0/0/4]port hybrid untagged vlan 10
[LSW2-Vlanif10]ip add 10.1.1.2 24
2. 配置BFD单跳检测
[LSW1]bfd
[LSW1]bfd 1to2 bind peer-ip default-ip interface GigabitEthernet 0/0/3
[LSW1-bfd-session-1to2]discriminator local 10
[LSW1-bfd-session-1to2]discriminator remote 20
[LSW1-bfd-session-1to2]commit
[LSW2]bfd
[LSW2]bfd 2to1 bind peer-ip default-ip interface GigabitEthernet 0/0/4
[LSW2-bfd-session-2to1]discriminator local 20
[LSW2-bfd-session-2to1]discriminator remote 10
[LSW2-bfd-session-2to1]commit
3. 配置BFD状态与接口状态联动
[LSW1]bfd 1to2
[LSW1-bfd-session-1to2]process-interface-status
[LSW2]bfd 2to1
[LSW2-bfd-session-2to1]process-interface-status
4. 验证配置
对LSW3的GE0/0/4接口执行shutdown操作，让BFD状态Down
[LSW3-GigabitEthernet0/0/4]shutdown
