It introduces an experimental procedure of system to help the teachers, students and network engineers to understand and master the technology of MPLS VPN after the discussion of the key technology.

给出了系统的实验流程，从而可以帮助教师、学生以及网络工程师通过在线实验更好地理解和掌握MPLS VPN技术。

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While something is wrong with the master device, the slave device can replace it quickly. Using standby technology will make service of communication network do not halt in a long time.

当主设备出现故障时，从设备迅速地接替它进行工作，这样就可以确保网络通讯不出现长时间的中断。

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