With the increase of the scale of optical netwoks, the optical networks is divided into many domains for security and administrative considerations.Namely,the survivability research and routing wavelength assignment in multi-domain optical ralph lauren polo shirts networks becomes a hot topic. The survivability research and routing wavelength assignment in single domain have done a large amount works.But, they all based on that each node knows the Lacoste Polo Shirts complete physical topology and resource allocations.To achieve scalability and due to security and administrative considerations,each domain only advertise reachability information in multi-domain networks.It leads to that the survivability and routing wavelength assignment algorithm of Cheap Lacoste Polo Shirts single optical domains cannot be used in multi-domain optical chi hair straightener networks.Topology aggregation can resolve the above challenges in multi-domain optical networks.We use the topology aggregation to resolve the survivability chi straightener and routing wavelength assignment of the multi-domain optical networks.The second chapter describes several topology aggragtion technologies.Compare there spatial complexity and the precision.The full mesh topology aggregation is most exact, but the routing overhead is worst.
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