Analysis of link failures in an IP backbone
Proceedings of the 2nd ACM SIGCOMM Workshop on Internet measurment
Fast local rerouting for handling transient link failures
IEEE/ACM Transactions on Networking (TON)
Selecting shorter alternate paths for tunnel-based IP Fast ReRoute in linear time
Computer Networks: The International Journal of Computer and Telecommunications Networking
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IP Fast ReRoute (FRR) mechanisms have been proposed to achieve fast failover for supporting Quality of Services (QoS) assurance. However, these mechanisms do not consider network performance after affected traffic is rerouted onto repair paths. As a result, QoS deterioration may still happen due to post-failure traffic congestion in the network, which nullifies the effectiveness of IP FRR. In this paper, by considering IP tunneling as the underlying IP FRR mechanism, we proposed an efficient algorithm to judiciously select tunnel endpoints such that the network performance is optimized after the repair paths are activated for rerouting. According to the simulation results using real operational network topologies and traffic matrices, the algorithm achieves significant improvement on post-failure load balancing compared to the traditional IGP re-convergence and plain tunnel endpoint selection without such consideration.