路由选择翻译分析.docVIP

Chapter 13. Routing Choices 第13章 路由选择 In the early days of networking, huge projects were undertaken to determine the best 在早期的网络、大型项目进行确定最佳 routing protocol—for some definition of “best. ” For instance, one project commissioned 路由协议的一些“最好的定义。“例如,一个项目委托 by the US Air Force attempted to measure the speed of convergence for each of the 由美国空军试图衡量收敛的速度 primary routing protocols (OSPF, IS-IS, and EIGRP), how much bandwidth each protocol 主要路由协议(OSPF是什么,EIGRP),多少带宽每个协议 used under normal operation, how much bandwidth was required when the protocol was 在正常的操作下,使用协议时需要多少带宽 converging (given a specific network topology and breakage scenarios), how many 融合(给定一个特定的网络拓扑和破损的场景),有多少 network engineers knew each of the protocols under investigation, and a number of other 网络工程师知道每个协议接受调查,和其他一些 factors. Ultimately, the project was designed to churn all these factors together and 因素。最终,该项目旨在生产和所有这些因素在一起 produce a single answer. 产生一个答案。 Underlying all these calculations was always some set of assumptions—assumptions 基本所有这些计算总是assumptions-assumptions的一些设置 rarely ever brought out into the light of day and clearly examined, much less fully justified. 很少了天日,明确检查,更充分的理由。 These assumptions are, in reality, the interesting piece of the “which routing protocol” 这些假设是,在现实中,“哪个路由协议”的有趣 puzzle. Here you will find the real intersection between the business and technology 谜题。在这里你会发现真正的业务和技术之间的十字路口 choices. 选择。 The first part of this chapter will deal with the “which routing protocol is best” question, 本章的第一部分将处理”,路由协议是最好的”问题, but we’ll be concerned with exposing the questions network architects need to ask in 但我们会关心揭露网络架构师需要问的问题 order to answer that question, rather than providing a one size fits all solution. 为了回答这个问题,而不是提供一个一刀切的解决方案。 Beyond choosing a routing protocol, there are questions around best practices in 除了选择路由协议,有问题的最佳实践 deploying routing; this is where the second part of this chapter concentrates. For instance, 部署路由,这是本章的第二部分集中的地方。例如, how should flooding domain bo