Method and Apparatus for Provisioning a Transport Service in a Multi-Domain Multi-Layer Network

An apparatus adapted to provision a transport service in a multi-domain multi-layer network comprising at least one client network layer domain and at least one server layer network domain, said apparatus comprising:

• means for providing a virtual topology of each of said server layer network domains depending on connectivity requirements set for a connectivity across said server layer network domains by each of the served client layer network domains as at least one segment of said client network layer domain topology;
• means for determining an end-to-end path between two client network nodes across one or more server layer network domains based on an overlay topology comprising the virtual topologies provided by each of said server layer network domains, access links connecting client network nodes of said client layer network domains to said server layer network domain and inter-domain links interconnecting said server layer network domains in the client layer;
• and
• means for provisioning a transport service via the determined end-to-end path.