Analysis of blocking probability for distributed lightpath establishment in WDM optical networks
IEEE/ACM Transactions on Networking (TON)
Benefits of advertising wavelength availability in distributed lightpath establishment
Computer Networks: The International Journal of Computer and Telecommunications Networking
An Evaluation of Distributed Parallel Reservations in Wavelength-Routed Networks
IEEE Journal on Selected Areas in Communications - Part Supplement
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The GMPLS distributed control plane is used in wavelength-routed networks to dynamically establish end-to-end lightpaths. During the signaling phase, lightpath requests can be blocked due to lack of available resources or due to resource contentions. Blocking due to resource contentions is the dominant source of blocking, when network is lightly loaded or lightpath requests are highly dynamic. To reduce the contentions, solutions based on extension of GMPLS signaling protocol (i.e., RSVP-TE) can be exploited, such as the Suggested Vector (SV) scheme proposed by the authors. This paper, first, thoroughly reviews the SV scheme and, then, it compares different wavelength selection policies to be applied to the SV scheme. Also, crankback mechanism of RSVP-TE is explored as a way to reduce the blocking. A comprehensive simulation analysis is carried out in a GMPLS-controlled wavelength-routed network, based on RSVPTE and OSPF-TE routing protocol. Simulation results demonstrate the effectiveness of SV scheme and crankback mechanism in strongly reducing resource contentions.