The abstract of this paper is :
Balancing the load among multiple paths leads to the degradation in the
all-optical WDM network. It is always desirable to deliver the entire
load on a single optimal path depending upon the current network-wide
load status. For this case, multiple light paths need to be maintained
to provide the choice of selecting the best light path, based on the
changing traffic load conditions, This paper presents the design and
analysis of an adaptive reliable multipath centralized routing algorithm
(ARMCR) with two central management systems (CMS-1 and CMS-2) which
considers load heuristic for selecting the optimal and backup paths.
Initially in this algorithm when a request comes to a source it sends
the information to CMS-1 for allocating the optimal primary and backup
paths for the received request, depending on the number of available
free wavelengths. With the assigned primary path, source starts clearing
the request meanwhile CMS-2 keeps track of the changes in the available
free wavelengths and failure of all the paths. In the assigned primary
path if the available free wavelength number comes below the threshold
number ‗N‘ and at the same time if any other path is available with more
number of free wavelengths, then CMS-2 assigns this path as primary
path and very next more number available free wavelengths path is
assigned as backup path. The advantage of this algorithm is that it
reduces the set up time by using two CMS which share the work and also
if one fails the other will take over the entire process. As opposed to
the reactive protocols, our proposed protocol is proactive in the sense
that it avoids the chances of blocking. Furthermore, the approach is
self-regulating, it automatically adapts to the traffic load variation
across the network. By simulation results, we showed that our proposed
protocol has low set up time and blocking.
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