Hi, Alex and RFC8345 authors: As we know, node, link, termination points are three basic elements in the network topology model, network-types defined in ietf-network model indicate certain type of the network, no definition of node-type and link-type in network topology model, see quoted text in section 4.1 of RFC8345 " A network has a certain type, such as L2, L3, OSPF, or IS-IS. A network can even have multiple types simultaneously. The type or types are captured underneath the container "network-types". In this model, it serves merely as an augmentation target; network-specific modules will later introduce new data nodes to represent new network types below this target, i.e., will insert them below "network-types" via YANG augmentation. " However in some cases, there might be multiple tunnels between the two nodes or endpoints, it seems network-types is not sufficient to indicate various type of tunnel technology between two nodes, especially when a network can have multiple network type simultaneously. So I believe link type or tunnel type should be added as link attributes of extension of ietf-network-topology model. Let me know if my understanding is correct.
-Qin
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