防火墙BFD检查

在模拟器上做实验防火墙堆叠，然后做一个BFD检查，没断开端口的时候状态为down，端口了BFD端口端口还是为down？这是咋回事？

[H3C]dis bfd session Total Session Num: 1 Up Session Num: 0 Init Mode: Active IPv4 Session Working Under Ctrl Mode: 

 LD/RD       SourceAddr        DestAddr        State          Holdtime          Interface 

 97/0           192.168.1.1     192.168.1.2       Down            0ms                  RAGG5 [H3C] 

interface Route-Aggregation5 

 mad bfd enable 

 mad ip address 192.168.1.1 255.255.255.0 member 1 

 mad ip address 192.168.1.2 255.255.255.0 member 2

 # 

interface GigabitEthernet1/0/2 

 port link-mode route 

 combo enable copper 

 port link-aggregation group 5 

# 

interface GigabitEthernet2/0/2

 port link-mode route

 combo enable copper 

 port link-aggregation group 5

 #