教程文件目录：
wolf实验室mpls lab视频全集
|-- ┃┃-mvpn-lab-07-intrl_chunk_3.wmv
|-- ┃┃-mvpn-lab-07-intrl_chunk_2.wmv
|-- ┃┃-mvpn-lab-07-intrl_chunk_1.wmv
|-- ┃┃-mvpn-lab-05-basicinas.wmv