华为设备配置动态BFD for IS-IS特性

1. 配置各接口所属VLAN
   [LSW1]vlan batch 10 20
   [LSW1-GigabitEthernet0/0/1]port link-type trunk
   [LSW1-GigabitEthernet0/0/1]port trunk allow-pass vlan 10
   [LSW1-GigabitEthernet0/0/2]port link-type trunk
   [LSW1-GigabitEthernet0/0/2]port trunk allow-pass vlan 20
   [LSW2]vlan batch 10 30 40
   [LSW2-GigabitEthernet0/0/1]port link-type trunk
   [LSW2-GigabitEthernet0/0/1]port trunk allow-pass vlan 10
   [LSW2-GigabitEthernet0/0/2]port link-type trunk
   [LSW2-GigabitEthernet0/0/2]port trunk allow-pass vlan 30
   [LSW2-GigabitEthernet0/0/3]port link-type trunk
   [LSW2-GigabitEthernet0/0/3]port trunk allow-pass vlan 40
   [LSW3]vlan batch 20 30
   [LSW3-GigabitEthernet0/0/2]port link-type trunk
   [LSW3-GigabitEthernet0/0/2]port trunk allow-pass vlan 20
   [LSW3-GigabitEthernet0/0/1]port link-type trunk
   [LSW3-GigabitEthernet0/0/1]port trunk allow-pass vlan 30
   [LSW4]vlan 10
   [LSW4-Ethernet0/0/1]port link-type trunk
   [LSW4-Ethernet0/0/1]port trunk allow-pass vlan 10
   [LSW4-Ethernet0/0/2]port link-type trunk
   [LSW4-Ethernet0/0/2]port trunk allow-pass vlan 10
2. 配置各交换机VLANIF接口的IP地址
   [LSW1-Vlanif10]ip add 10.1.1.1 24
   [LSW1-Vlanif20]ip add 10.2.1.1 24
   [LSW2-Vlanif10]ip add 10.1.1.2 24
   [LSW2-Vlanif30]ip add 10.3.1.2 24
   [LSW2-Vlanif40]ip add 10.4.1.2 24
   [LSW3-Vlanif20]ip add 10.2.1.3 24
   [LSW3-Vlanif30]ip add 10.3.1.3 24
   3.关闭STP：在使能STP的环形网络中，如果用交换机的VLANIF接口构建三层网络，会导致某个端口被阻塞，从而导致三层业务不能正常运行
   [LSW1]stp disable
   [LSW2]stp disable
   [LSW3]stp disable
   [LSW4]stp disable
3. 配置IS-IS基本功能
   [LSW1]isis
   [LSW1-isis-1]is-level level-2
   [LSW1-isis-1]network-entity 10.0000.0000.0001.00
   [LSW1-Vlanif10]isis enable 1
   [LSW1-Vlanif20]isis enable 1
   [LSW2]isis
   [LSW2-isis-1]is-level level-2
   [LSW2-isis-1]network-entity 10.0000.0000.0002.00
   [LSW2-Vlanif10]isis enable 1
   [LSW2-Vlanif30]isis enable 1
   [LSW2-Vlanif40]isis enable 1
   [LSW3]isis
   [LSW3-isis-1]is-level level-2
   [LSW3-isis-1]network-entity 10.0000.0000.0003.00
   [LSW3-Vlanif20]isis enable 1
   [LSW3-Vlanif30]isis enable 1
   
   

可以看到去往10.4.1.0/24网段的下一跳时10.1.1.2
5. 配置接口开销值，缺省为10
[LSW1-Vlanif10]isis cost 5
[LSW2-Vlanif10]isis cost 5
6. 配置IS-IS进程的BFD特性
[LSW1]bfd
[LSW1]isis
[LSW1-isis-1]bfd all-interfaces enable
[LSW2]bfd
[LSW2]isis
[LSW2-isis-1]bfd all-interfaces enable
[LSW3]bfd
[LSW3]isis
[LSW3-isis-1]bfd all-interfaces enable

7. 配置接口的BFD特性：指定最小发送和接收间隔为100ms，本地检测时间倍数为4
   [LSW1-Vlanif10]isis bfd enable
   [LSW1-Vlanif10]isis bfd min-tx-interval 100 min-rx-interval 100 detect-multiplir 4
   [LSW2-Vlanif10]isis bfd enable
   [LSW2-Vlanif10]isis bfd min-tx-interval 100 min-rx-interval 100 detect-multiplier 4
   

8. 检查配置：shutdown LSW2的g0/0/1接口，模拟链路故障
   [LSW2-GigabitEthernet0/0/1]shutdown
   

可以看出备份链路生效

可以看出只有备份链路之间的BFD生效