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随着数据业务的不断发展繁荣,IP承载网来承载传统语音业务、视频业务、VPN专线业务、组播业务等高附加值业务。由于传统的互联网是基于IP的不面向连接的网络,这种尽力而为的网络,不能根据不同的业务类型提供不同的服务保证,不能保证NGN语音等特殊业务的需求。对于IP承载网而言,在承载多业务大规模的商用运营网的基础上运用QOS实现网络资源的可知、可控、可管成为必然趋势。
With the constant development and prosperity of data services, IP bearer networks carry high value-added services such as traditional voice services, video services, VPN leased lines and multicast services. Since the traditional Internet is an IP-based, connectionless network, this best-effort network can not provide different service guarantees according to different service types and can not guarantee the demand of special services such as NGN voice. For IP bearer network, it is an inevitable trend to use QOS to realize network resources on the basis of carrying large-scale commercial operation network of multi-services.