在模拟器上测试IRF2的MAD检测，dis mad verbose，看到状态一直是Faulty

在模拟器上测试IRF2的MAD检测，dis mad verbose，看到状态一直是Faulty，正常么？怎么解决？

[SWA]dis mad verbose

Multi-active recovery state: No

Excluded ports (user-configured):

Excluded ports (system-configured):

  Ten-GigabitEthernet1/0/51

  Ten-GigabitEthernet2/0/51

MAD ARP disabled.

MAD ND disabled.

MAD LACP disabled.

MAD BFD enabled interface: Vlan-interface100

  MAD status                 : Faulty

  Member ID   MAD IP address       Neighbor   MAD status

  1           100.1.1.1/24         2          Faulty    

  2           100.1.1.2/24         1          Faulty