Abstract
In this paper, quality of transmission (QoT)-aware lightpath provisioning
schemes for transparent optical networks are proposed and assessed. The main
idea is to overcome lightpath blocking due to excessive physical impairments
(i.e., unacceptable QoT) by means of successive lightpath set up attempts
performed by generalized multiprotocol label switching (GMPLS) signaling protocol
along alternate routes. The schemes are enabled by the introduction into current
GMPLS signaling protocol [i.e., resource reservation protocol with traffic
engineering (RSVP-TE)] of extensions which encompass the QoT parameters that
characterize the optical layer. Differently from previous approaches, the
proposed GMPLS-based schemes are still distributed but they do not imply the
introduction of additional extensions into the routing protocol (e.g., OSPF-TE).The QoT-aware provisioning schemes are first validated by simulations
performed on a WDM mesh network. Results show that only few successive set
up attempts are required to complete the lightpath establishment. In addition,
an experimental demonstration where the proposed RSVP-TE extensions are implemented
in the control plane of a transparent metro network is reported showing that
impairment-aware lightpath provisioning is achieved on a time scale of few
milliseconds.
© 2008 IEEE
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