Experimenting Hierarchical PCE Architecture in a Distributed Multi-Platform Control Plane Testbed
The Path Computation Element (PCE) architecture is widely recognized to enable Traffic Engineering (TE) solutions even in network scenarios where available resources information exchange is limited (e.g., multi-layer, multi-domain, multi-carrier). In the typical multi-domain scenario, a single PCE is responsible for path computation inside each domain, while the inter-domain path computation is the result of a coordinated communication process among different PCEs, using the PCE Protocol (PCEP) and assuming that the domain sequence is known in advance, as, for instance, in the Backward Recursive PCE-based Computation (BRPC) procedure. A distributed control plane test-bed, connecting four European institutions, is developed to enable interoperability testing among independent PCE platforms and evaluate inter-domain computation algorithms based on the hierarchical PCE. Performance results are detailed and discussed.