当前,无论在企业网、园区网还是在广域网上,业务量的发展都超出了过去最乐观的估计,上网热潮风起云涌,新的应用层出不穷,即使按照当时最优配置建设的网络,也很快就会感到吃不消。尤其是各个网络的核心部分,其数据流量和计算强度之大,使得单一设备根本无法承担。而如何在完成同样功能的多个网络设备之间实现合理的业务量分配,使之 Currently, no matter in the enterprise network, campus network or WAN, the development of the business goes beyond the most optimistic estimation in the past. The surfing surges in the internet and new applications emerge in an endless stream. Even if the network is constructed according to the optimal configuration at that time, Will feel too much. In particular, the core of each network, its data traffic and computational intensity of large, making a single device simply can not afford. And how to achieve the same function of multiple network devices to achieve a reasonable allocation of traffic so that