配置步骤：
IRF的配置步骤:
1、配置IRF域（域ID=10、成员ID、优先级）
irf domain 10
irf member 1 priority 10
irf member 2 priority 1
2、进入物理端口，禁用端口
[DS1]interface range Ten-GigabitEthernet 1/0/49 to Ten-GigabitEthernet 1/0/50
[DS1-if-range]shutdown
3、创建IRF端口，将端口加入IRF端口
[DS1-irf-port1/1]port group interface Ten-GigabitEthernet 1/0/49
[DS1-irf-port1/1]port group interface Ten-GigabitEthernet 1/0/50
4、启用物理端口
[DS1]interface range Ten-GigabitEthernet 1/0/49 to Ten-GigabitEthernet 1/0/50
[DS1-if-range]undo shutdown
5、保存文件
save
6、激活IFR端口
[DS1]irf-port-configuration active
MAD BFD 配置步骤：
1、创建VLAN
vlan 100
2、用于MAD BFD物理端口加入VLAN100
[DS1-Ten-GigabitEthernet1/0/51]port access vlan 100
[DS1-Ten-GigabitEthernet2/0/51]port access vlan 100
3、进入VLAN100端口（启用MAD BFD）
[DS1]interface Vlan-interface 100
[DS1-Vlan-interface100]mad bfd enable
mad ip address 192.168.100.1 255.255.255.0 member 1
mad ip address 192.168.100.2 255.255.255.0 member 2
4、进入MAD BFD物理端口，禁用FTP
[DS1-Ten-GigabitEthernet1/0/51]undo stp enable
[DS1-Ten-GigabitEthernet2/0/51]undo stp enable