Although people believe that packet switching networks will inevitably replace circuit switching, circuit switching still occupies an irreplaceable position in many fields because packet networks still lack effective QOS technology. This paper proposes a simple and effective method to ensure IP network QOS. With this method, end-to-end quality control can be achieved at least on the metropolitan area network. Services with very high QOS requirements no longer have to use circuit dedicated lines, but can be directly carried on the IP metropolitan area network, giving full play to the statistical multiplexing advantages of packet switching and avoiding the complexity of dedicated line circuit management.
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