Basic Specification for IP Fast Reroute: Loop-Free Alternates
Basic Specification for IP Fast Reroute: Loop-Free Alternates
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DOI：
10.17487/rfc5286
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发表时间：
2008-09
期刊：
影响因子：
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通讯作者：
Alia Atlas;A. Zinin
中科院分区：
文献类型：
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作者：
Alia Atlas;A. Zinin
本文档描述了在纯IP和MPLS/LDP网络中，当出现单一故障（无论是链路、节点还是共享风险链路组[SRLG]故障）时，如何使用无环替代路径为单播流量提供本地保护。该技术的目标是减少因故障导致拓扑结构改变后路由器收敛过程中发生的数据包丢失。通过使用预先计算的无环且安全的备份下一跳，在分布式网络收敛过程完成之前都可使用，从而实现快速故障修复。这种简单的方法不需要其他路由器的任何支持。本规范能够在多大程度上实现这一目标取决于网络的拓扑结构。
This document describes the use of loop-free alternates to provide local protection for unicast traffic in pure IP and MPLS/LDP networks in the event of a single failure, whether link, node or shared risk link group (SRLG). The goal of this technology is to reduce the packet loss that happens while routers converge after a topology change due to a failure. Rapid failure repair is achieved through use of precalculated backup next-hops that are loop-free and safe to use until the distributed network convergence process completes. This simple approach does not require any support from other routers. The extent to which this goal can be met by this specification is dependent on the topology of the network.