The Enterprise Strategy Group (ESG) has released this week a whitepaper and companion video looking at virtual network overlays and their use in multi-tenant environments. This comes on the heels of the ESG research brief on Cisco’s recently announced Cisco ONE set of network programming interfaces which includes Nexus 1000V-based virtual overlays.
ESG points out that virtual network overlays are important to building out multi-tenant environments like private and hybrid clouds, as well as overcoming scalability issues in those environments that have traditionally been based on VLANs. As ESG notes, and as Cisco mentioned in it’s ONE announcement, programmability of the virtual networks is what really separates them from classic overlays based on MPLS or GRE tunnels. The Nexus 1000V will achieve this programmability capability by SDN API’s such as OpenStack on top of the Nexus 1000V virtual supervisor module.