Benefits of Link Protection at Connection Granularity
BROADNETS '04 Proceedings of the First International Conference on Broadband Networks
A new approach for designing fault-tolerant WDM networks
Computer Networks: The International Journal of Computer and Telecommunications Networking
Supporting multiple protection strategies in optical networks
IEEE/ACM Transactions on Networking (TON)
Recovery, routing and load balancing strategy for an IP/MPLS network
ITC20'07 Proceedings of the 20th international teletraffic conference on Managing traffic performance in converged networks
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Resiliency to link failures in optical networks is becomingincreasingly important due to the increasing data ratein the fiber. Path protection schemes attempt to guaranteea backup path for a connection upon a failure in the network,thereby reducing the recovery time for a connection.In this paper, we develop a failure dependent path protectionscheme that dynamically assigns a primary path andbackup paths, one for each failure that would affect the primarypath. A connection established on the primary pathwill be re-established on its backup path only if a failurein the network affects the connection. We evaluate theperformance of our developed protocol and compare withan alternative approach based on sub-graph routing thatachieves high network utilization and low blocking probabilityat the cost of re-establishing connections even if thefailure in the network does not affect the primary path of theconnection. We observe that up to a factor of eight reductionin the number of reconfiguration scenarios is achieved withless than 10% reduction in effective network utilization andless than 3% reduction in fairness metrics for tolerating anysingle link failure in NSFNET and ARPA-2 networks. Thefailure dependent protection approach developed in this paperis also applicable to any general failure scenarios thatare modeled as shared risk link group failures.