Abstract
In interconnected optical networks, users submit lightpath requests at the time
they wish to establish the lightpath. The service provider consults the information
gathered by the interdomain routing protocols for available resources. For each request,
the network must decide immediately whether to accept or reject the request. In this
model, there is always the uncertainty of whether the user will be able to establish the
desired lightpath at the desired time or not. Furthermore, in the context of a number of
applications, e.g., grid applications, users need to set up lightpaths in advance to
perform their activities that are planned in advance. We propose a new interdomain
routing protocol called Advance Optical Routing Border Gateway Protocol (AORBGP) and a
scheme that allows the setup of interdomain lightpaths in advance. AORBGP allows
gathering information about interdomain paths and availability of wavelengths in the
future. The proposed advance lightpath setup scheme makes use of AORBGP to get
information about available resources (i.e., wavelengths) required to process lightpath
setup requests. One of the key innovations of the scheme is that it provides the user
with alternatives, carefully selected, when his or her request cannot be accommodated
because of resource shortages. Indeed, the scheme provides the user with options to set
up a lightpath later than the requested start time or with shorter duration than the
requested duration. We performed a set of simulations to evaluate the benefits of the
proposed scheme and the effect of a number of parameters on the performance of
AORBGP.
© 2005 Optical Society of America
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