virtual fabric是由Brocade提供的一项交换机功能，类似于Cisco交换机的VSAN功能。
注意：
开启和关闭virtual fabric功能会导致交换机重启服务，会中断现有交换机数据传输。
1.开启virtual fabric功能
DS_5100B:root> fosconfig --enable vf
WARNING: This is a disruptive operation that requires a reboot to take effect.
All EX ports will be disabled upon reboot.
Would you like to continue [Y/N]:
2.关闭virtual fabric功能
DS_5100B:root> fosconfig --disable vf
WARNING: This is a disruptive operation that requires a reboot to take effect.
Would you like to continue [Y/N]:
