Segment Routing Centralized BGP Egress Peer Engineering
Segment Routing Centralized BGP Egress Peer Engineering
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DOI：
10.17487/rfc9087
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发表时间：
2017-12
期刊：
影响因子：
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通讯作者：
C. Filsfils;S. Previdi;G. Dawra;E. Aries;Dmitry Afanasiev
中科院分区：
文献类型：
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作者：
C. Filsfils;S. Previdi;G. Dawra;E. Aries;Dmitry Afanasiev
段路由（SR）利用源路由。节点通过在分组前添加SR报头来引导分组通过受控的指令集（称为段）。段可以表示任何指令拓扑或基于服务。SR允许通过任何拓扑路径强制流，同时仅在SR域的入口节点处维持每流状态。分段路由架构可以直接应用于MPLS数据平面，而无需在转发平面上进行更改。它需要对现有的链路状态路由协议做一个小的扩展.本文档说明了分段路由在解决BGP出口对等工程（BGP-EPE）要求方面的应用。基于SR的BGP-EPE解决方案允许集中式（软件定义网络，SDN）控制器在入口边界路由器或域内主机处对任何出口对等策略进行编程。
Segment Routing (SR) leverages source routing. A node steers a packet through a controlled set of instructions, called segments, by prepending the packet with an SR header. A segment can represent any instruction topological or service-based. SR allows to enforce a flow through any topological path while maintaining per-flow state only at the ingress node of the SR domain. The Segment Routing architecture can be directly applied to the MPLS dataplane with no change on the forwarding plane. It requires a minor extension to the existing link- state routing protocols. This document illustrates the application of Segment Routing to solve the BGP Egress Peer Engineering (BGP-EPE) requirement. The SR-based BGP-EPE solution allows a centralized (Software Defined Network, SDN) controller to program any egress peer policy at ingress border routers or at hosts within the domain.