多点到多点MPLS隧道的快速路由扩展

M. Chaitou, J.-L. Le Roux
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引用次数: 4

摘要

为了支持多点到多点(MP2MP) MPLS te隧道的保护,本文提出了对RSVP-TE的快速路由扩展。为了保护主MP2MP te隧道的元素(链路或节点),我们建议使用MP2MP旁路te隧道连接受保护元素周围的一组节点。当MP2MP主TE-tunnel发生故障时,主TE-tunnel被封装到MP2MP旁路TE-tunnel中,这就需要定义一种新的MPLS层次结构,即多点到多点的层次结构。在被保护元素的上游,主MP2MP TE-tunnel的节点,称为上游保护节点UPN (upstream protection node),选择MP2MP旁路TE-tunnel进行保护。通过扩展依赖于上游标签分配的点到多点MPLS层次结构,我们根据bypass te隧道的叶子数量和每个bypass隧道的upn数量讨论了几种扩展方案。通过仿真分析了这些方案之间的可伸缩性/带宽消耗权衡。该方法可以有效地用于点对点和点对多点te隧道的保护,因为这些隧道实际上是MP2MP te隧道的特殊情况。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Fast-reroute extensions for multi-point to multi-point MPLS tunnels
This paper proposes fast reroute extensions to RSVP-TE in order to support the protection of multipoint to multipoint (MP2MP) MPLS TE-tunnels. To protect an element (link or node) of a primary MP2MP TE-tunnel, we propose to use an MP2MP bypass TE-tunnel connecting a set of nodes around the protected element. During failure the primary MP2MP TE-tunnel is encapsulated into the MP2MP bypass TE-tunnel which calls for defining a new type of MPLS hierarchy, the multipoint to multipoint hierarchy. The node of the primary MP2MP TE-tunnel upstream to the protected element, called the upstream protecting node (UPN), selects the MP2MP bypass TE-tunnel to be used for the protection. By extending the point to multipoint MPLS hierarchy, which relies on the upstream label assignment, we discuss several extensions scenarios depending on the number of leaves of a bypass TE-tunnel and on the number of UPNs per bypass tunnel. The scalability/bandwidth-consumption tradeoff between these schemes is analyzed by means of simulations. The proposed method can be efficiently used for the protection of point-to-point and point-to-multipoint TE-tunnels as well, as such tunnels are actually particular cases of MP2MP TE-tunnels.
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