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This paper attends to the problem of embedding flexibly specified virtual networks connecting cloud resources (e.g., storage or computation) on a given substrate (e.g., a data center, an ISP backbone, a router site, or a virtual provider network). The authors study a scenario where a substrate provider (or a potential intermediate broker or reseller) wants to optimize the embedding of these so-called CloudNets by migrating them to more suitable locations. For instance, such re-embeddings can be useful if the CloudNets were requested at short notice and initially placed heuristically. Subsequent optimizations can, e.g., reduce the peak resource loads in the network by spreading CloudNets across the infrastructure or save energy by moving CloudNets together and switching off unused components.
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