重要网络设备全部采用双点备份，避免单点故障，增强了网络的可靠性。
Important network equipment used to back up two-point, to avoid single point of failure, and enhance network reliability.
并且在实现双接入服务器热备份的同时，不需要另外增加外部设备，降低了系统的复杂度，提高了系统的可靠性。
And it realizes the thermal backup of double access servers and at the same time, does not need additional external devices, reduces the system complexity and enhances the system reliability.
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