Determining a path in a communication network

A network control entity for end-to-end path computation across a plurality of domains in a communication network, the network control entity comprising processing circuitry, the processing circuitry being configured to cause the network control entity to:

• receive a request for a path across the plurality of domains;
• compute the end-to-end path across the plurality of domains as part of a hierarchical path computation, wherein computing the end-to-end path comprises determining that a stored path matches one or more criteria of the end-to-end path, wherein the stored path is the end-to-end path across the plurality of domains, and, in response to said determining, using the stored path for the end-to-end path computation;
• and
• transmit information indicating at least part of the stored path to a domain control entity configured to control a one of the plurality of domains involved in the end-to-end path.