Telefonica Nokia Nokia Cisco Everything OPS This document defines a YANG data model for representing an abstracted view of a network topology that contains Intermediate System to Intermediate System (IS-IS). This document augments the 'ietf-network' and 'ietf-network-topology' data models by adding IS- IS concepts and explains how the data model can be used to represent the IS-IS topology. The YANG data model defined in this document conforms to the Network Management Datastore Architecture (NMDA).