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Intent-based networking is considered as a key paradigm to automate the provisioning of network slices (NwSs) on top of a common infrastructure. This automation is intended for all the phases of a NwS lifecycle, starting from the preparation/design phase. An intent-based system should enable expressing tenant intents for NwSs at a high-level of abstraction, i.e. the tenant is not required to be aware of the low-level infrastructure details. Therefore, the system should have the capability of translating the high-level intents into low-level intents that can be mapped directly to deployment artifacts or executable actions. In line with this concept, we propose an approach to select the VNFs/PNFs that compose NwSs required through high-level intents. In order to achieve this, the proposed approach starts by decomposing the high-level intents by the means of an ontology representing a knowledge base for NwS design. The approach handles and propagates the placement and isolation intents expressed for the required NwSs. The decomposed intents allow for selecting the appropriate VNFs/PNFs as well as determining their constraints with respect to location and anti-affinity constraints. This approach is one of the building blocks of an intent-based NwS design process. |
