Problem Statement: Overlays for Network Virtualization
2014
This document describes issues associated with providing multi-tenancy
in large data center networks and how these issues may be addressed
using an overlay-based network virtualization approach. A key multi-
tenancy requirement is traffic isolation so that one tenant's
traffic is not visible to any other tenant. Another requirement is
address space isolation so that different tenants can use the same
address space within different virtual networks. Traffic and address
space isolation is achieved by assigning one or more virtual networks
to each tenant, where traffic within a virtual network can only cross
into another virtual network in a controlled fashion (e.g., via a
configured router and/or a security gateway). Additional functionality
is required to provision virtual networks, associating a virtual
machine's network interface(s) with the appropriate virtual network
and maintaining that association as the virtual machine is activated,
migrated, and/or deactivated. Use of an overlay-based approach enables
scalable deployment on large network infrastructures.
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