less standard multilevel network mo

less standard multilevel network model, made from nodes and connections between them. This model enables
global network view on highest (or top) level, with drilldown possibilities toward details “hidden” in lower levels
(figure 1). For the purpose of network presentation, it is allowed to add virtual graphical elements in the model,
serving as “containers” for “real” network elements; “Real” network elements are graphical abstraction of
existing network resources, both nodes and connections between nodes, while “containers” are virtual objects
containing real network elements or other containers. In this paper, the term “network element“ or “object” will
refer to “real” network element. Usage of containers allows creation of any logical network structure (e.g.
network elements organized geographically, by vendor,
by technology or any other criteria). That structure is
tree-like structure, where “leafs” are network elements.