Abstract
In wavelength-routed networks based on a GMPLS control plane, the resource
reservation protocol with traffic engineering extensions (RSVP-TE) allows
to establish end-to-end lightpaths. The resource reservation can be blocked
due to lack of available resources (forward blocking) or due to resource contentions
(backward blocking). In wavelength-routed networks, the backward blocking
is the predominant blocking contribution, when traffic load is low or highly-dynamic
and when lightpath restoration takes place. To reduce the backward blocking,
the paper proposes two label preference (LP) schemes compliant with RSVP-TE
message exchanges. LP schemes provide the destination node with a label identifying
the preferred wavelength to reserve. The preferred label is computed in a
distributed way during the forward signaling phase, with the objective of
assigning disjoint wavelengths to reservation attempts that may contend the
resources. Simulation results demonstrate that, compared to other schemes,
LP schemes are effective in reducing the backward blocking during both lightpath
provisioning and restoration, without negatively impacting the forward blocking.
© 2009 IEEE
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