The routing and wavelength assignment algorithm is a complex task in today's dynamically
switched networks. As
the number of network nodes and links increases, advertising
link states requires more control messages, larger databases and more processing capacity
while searching for an available path.
Information aggregation in multi-domain networks helps us
to reduce the number of advertised links. Furthermore, there
are numerous information update strategies that also result in
less link state control messages. However, these enhancements are done on the account
of information inaccuracy, which leads to higher blocking ratio and longer setup delays.
In our article we present a Physical Device Abstraction Layer
for the Control Plane where interior optical switches having different multiplexing
capabilities and exterior autonomous domains are treated in a unified way. Next we
show and analyse solutions for how to apply information update strategies on multilayer
networks and how to extend these strategies to fit into multidomain environment.
