论文信息 - CAM05-1: Impact of Unprotected Multi-Failures in Resilient SPM Networks: a Capacity Dimensioning Approach

CAM05-1: Impact of Unprotected Multi-Failures in Resilient SPM Networks: a Capacity Dimensioning Approach

Restoration or protection switching mechanisms protect traffic in packet-switched networks against local outages by deviating it around the failure location. This assures connectivity, but sufficient backup capacity is also needed to maintain quality of service (QoS) for the duration of the outage. To that end, sufficient capacity must be provided on the links so that the network can survive a set of protected failure scenarios without congestion due to redirected traffic. The self- protecting multipath (SPM) is a protection switching mechanism for which the required backup capacity can be minimized by linear optimization methods. However, unprotected multi-failures may lead to congestion in such "resilient networks" since backup capacity may be missing. In this paper, we quantify and compare the impact of unprotected double failures on the QoS for the optimized SPM, single shortest path routing (SSP), and equal- cost multipath (ECMP) routing.

Michael Menth | Rüdiger Martin | Ulrich Spörlein

[1] Michael Menth,et al. Network Dimensioning for the Self-Protecting Multipath: A Performance Study , 2006, 2006 IEEE International Conference on Communications.

[2] Bianca Schroeder,et al. IGP link weight assignment for transient link failures , 2003 .

[3] Mikkel Thorup,et al. Robust optimization of OSPF/IS-IS weights , 2003 .

[4] Andreas Kirstädter,et al. Engineering end-to-end IP resilience using resilience-differentiated QoS , 2002, IEEE Commun. Mag..

[5] Alia Atlas,et al. Basic Specification for IP Fast Reroute: Loop-Free Alternates , 2008, RFC.

[6] Alia Atlas,et al. Fast Reroute Extensions to RSVP-TE for LSP Tunnels , 2005, RFC.

[7] Michael Menth,et al. Efficient admission control and routing for resilient communication networks , 2004 .

[8] Michael Menth,et al. Self-Protecting Multipaths - A Simple and Resource-Effcient Protection Switching Mechanism for MPLS Networks , 2004, NETWORKING.

[9] M. Menth,et al. Network resilience through multi-topology routing , 2005, DRCN 2005). Proceedings.5th International Workshop on Design of Reliable Communication Networks, 2005..