广域网流量调度的常用技术有哪些
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- 2024-11-04提问
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广域网流量调度的常用技术主要包括以下几种：
一、智能流量调度技术
智能流量调度技术通过流量调度和管理的技术创新，实现动态、精确的流量控制，从而提升业务质量和链路资源利用效率。这种技术可以应用于广域网基本QoS设计、双链路流量调度设计、广域网园区或分支出口流量调度设计等多种场景。
二、软件定义广域网（SD-WAN）技术
SD-WAN技术利用集中式控制器对网络进行管理和配置，实现了对流量的智能调度和优化。相比传统的广域网流量调度方案，SD-WAN技术具有更高的灵活性和可扩展性，能够更好地适应网络拓扑变化和流量负载波动的情况。
三、流量监管技术（如CAR）
流量监管技术，如CAR（Committed Access Rate，承诺访问速率），是一种流量控制技术。它通过对进入网络的流量速率进行监督，对超出部分的流量进行限制或“惩罚”，以保护网络资源和用户的利益。CAR技术采用令牌桶控制流量，当令牌桶中存有令牌时，允许报文取令牌进行传输；当令牌桶中没有令牌时，报文必须等待桶中生成了新的令牌后才能继续发送。
四、InterServ方式
InterServ方式是一种集中服务方式，主要应用于早期的广域网专线，如ATM、FR等。通过将线路划成多个PVC（Permanent Virtual Circuit，永久虚电路），并为每个PVC分配所需的保证带宽（CBR），实现不同类型业务的传输带宽和时延质量保证。然而，由于该方式要求网络中的所有节点都记录并保留每个类型业务流的资源预留状态，同时为每个类型的业务流设置单独的内部虚电路资源，因此在大型网络中，业务流数量非常庞大时，对网络节点设备的处理能力有着非常高的要求。因此，InterServ方式主要在早期的广域网线路中应用，而不再适应当前以IP为主的广域网线路以及日益增多的应用业务。
五、基于BGP的流量调度技术
一些大型互联网公司，如Facebook，采用了基于BGP（Border Gateway Protocol，边界网关协议）的流量调度技术。通过扩展一些组件来采集路由和流量信息，使用标准的BGP来实现自动化的流量调度。这种技术可以实现对流量的细粒度控制，并优化网络性能和资源利用效率。
综上所述，广域网流量调度的常用技术包括智能流量调度技术、SD-WAN技术、流量监管技术（如CAR）、InterServ方式以及基于BGP的流量调度技术等。这些技术各有特点，可以根据具体的应用场景和需求进行选择和优化。
- 2024-11-04回答
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