High level architecture and general features
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Functional overview
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We foresee two OpenStack deployment models:
 1. Single-cloud. Centralized OpenStack controller and ENFVI nodes are Compute nodes
 2. Multi-cloud. Each NFVI node contains OpenStack controller, thus it becomes "embedded cloud" 
    with single compute node

Architecture Overview
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Architecture overview is here.

General Features and Requirements
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This is main part.

High level northbound interface specification
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What is northbound here? VIM controller?