SRLG-Aware Topology Aggregation for Survivable Multi-Domain Optical Networks

In multi-domain optical networks, due to confidentiality and management considerations, it may be infeasible to broadcast complete domain state information among domains. Nevertheless, sufficient information on each domain is required in order to keep network activities operating successfully. Topology Aggregation (TA) may be adopted to abstract a domain´s detailed topology into an aggregated topology which only shows limited information about the network. With the introduction of Shared Risk Link Groups (SRLGs), each of which includes a set of links affected by the same failure, the TA approach needs to consider the presence of SRLGs to generate a more survivable aggregated topology. In this paper, we propose SRLG-aware topology aggregation approaches that can help in finding a pair of inter-domain paths with a minimum set of common SRLGs.