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局域网的广泛应用以及互联网的快速发展，使企业数据通信得到了飞速的发展。数字数据网（DDN）也随之得到了很快的发展。目前许多公司、企业采用租用DDN专线的方式来构造自己的虚拟专用网（VPN）。由于租用专线的成本较高，而数据业务是突发性的，故租用专线的带宽不能得到充分
The widespread use of LAN and the rapid development of the Internet have led to the rapid development of enterprise data communications. Digital Data Network (DDN) has also been rapid development. At present, many companies and enterprises adopt the way of leasing DDN leased line to construct their own virtual private network (VPN). Due to the high cost of leased line and the sudden burst of data service, the bandwidth of leased line can not be fully utilized