(In the mid-1990s, the development of router technology lagged far behind the development speed and scale of the network, mainly manifested in the low forwarding efficiency and the inability to provide QoS guarantee. The reason is: at that time, the route search algorithm used the longest matching principle, and software must be used to search; The essence of IP is the "best effort" that "only cares about the process, not the result". At that time, there was a popular argument in the Jianghu: too simple IP technology could not bear the future of the network, and the Internet based on IP technology was bound to collapse in a few years.)
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