组网图

3 配置步骤

3.1  交换机DeviceA、B堆叠配置

具体配置可参考交换机虚拟化配置举例，本章不做介绍。

3.2  配置BFD MAD

# 创建VLAN 3，并将Device A上的端口GigabitEthernet1/0/1和Device B上的端口GigabitEthernet2/0/1加入VLAN3中。

<DeviceA> system-view

[DeviceA] vlan 3

[DeviceA-vlan3] port gigabitethernet 1/0/1 gigabitethernet 2/0/1

[DeviceA-vlan3] quit

# 创建VLAN接口3，并配置MAD IP地址。

[DeviceA] interface vlan-interface 3

[DeviceA-Vlan-interface3] mad bfd enable

[DeviceA-Vlan-interface3] mad ip address 192.168.2.1 24 member 1

[DeviceA-Vlan-interface3] mad ip address 192.168.2.2 24 member 2

[DeviceA-Vlan-interface3] quit

# 因为BFD MAD和生成树功能互斥，所以在GigabitEthernet1/0/1和GigabitEthernet2/0/1上关闭生成树协议。

[Sysname] interface gigabitethernet 1/0/1

[Sysname-gigabitethernet1/0/1] undo stp enable

[Sysname-gigabitethernet1/0/1] quit

[Sysname] interface gigabitethernet 2/0/1

[Sysname-gigabitethernet2/0/1] undo stp enable

3.3  保存配置

save force

3.4  实验结果验证

[H3C]display  mad

MAD ARP disabled.

MAD ND disabled.

MAD LACP disabled.

MAD BFD enabled.

[H3C]display mad verbose

Multi-active recovery state: No

Excluded ports (user-configured):

Excluded ports (system-configured):

 Ten-GigabitEthernet1/1/2

 Ten-GigabitEthernet2/1/1

MAD ARP disabled.

MAD ND disabled.

MAD LACP disabled.

MAD BFD enabled interface: Vlan-interface3

  MAD status                 : Faulty          \\MAD状态为:Faulty状态说明堆叠分裂

  Member ID   MAD IP address       Neighbor   MAD status

  1           192.168.2.1/24      2          Faulty  

此时使用“display interface brief down”查看端口时发现端口全部被关闭，状态为mad shutdown

<H3C>display interface brief down

Brief information on interfaces in route mode:

Link: ADM - administratively down; Stby - standby

Interface            Link   Cause                   

GE2/0/2              DOWN   MAD ShutDown              

GE2/0/3              DOWN   MAD ShutDown  

3.5  注意事项

1、 BFD MAD和STP功能互斥，用于BFD MAD检测的端口不能使能STP功能

2、 使能BFD MAD检测功能的三层接口只能专用于BFD MAD检测，不允许运行其它业务。如果配置了其它业务，可能会影响该业务以及BFD MAD检测功能的运行