Abstract
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Recent SDN-based solutions give cloud prov … Recent SDN-based solutions give cloud providers the
opportunity to extend their “as-a-service” model with the offer
of complete network virtualization. They provide tenants with
the freedom to specify the network topologies and addressing
schemes of their choosing, while guaranteeing the required level
of isolation among them. These platforms, however, have been
targeting the datacenter of a single cloud provider with full
control over the infrastructure.
This paper extends this concept further by supporting the
creation of virtual networks that span across several datacenters,
which may belong to distinct cloud providers, while including
private facilities owned by the tenant. In order to achieve this,
we introduce a new network layer above the existing cloud
hypervisors, affording the necessary level of control over the
communications while hiding the heterogeneity of the clouds.
The benefits of this approach are various, such as enabling
finer decisions on where to place the virtual machines (e.g., to
fulfill legal requirements), avoiding single points of failure, and
potentially decreasing costs. Although our focus in the paper is
on architecture design, we also present experimental results of a
first prototype of the proposed solution.
first prototype of the proposed solution.
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