SANTA CLARA \u2013 In a convincing example of the viability of open source networking, cloud provider DreamHost saved 70% in capital and 40% in operational costs by replacing VMware\u2019s NSX SDN with open source alternatives.\nIn a presentation at the Open Networking Summit here, suppliers Cumulus Networks and Akanda \u2013 a DreamHost spin-out NFV business -- said the cloud provider replaced NSX due to scaling and Layer 3 support issues. DreamHost did not speak and was not present during the presentation, but posted a blog entry on the project here last Friday.\n+MORE ON NETWORK WORLD: DreamHost report shows common types of government requests for information+\nThe project involved DreamHost\u2019s DreamCompute public cloud compute service, which is based on OpenStack and Ceph object store and file system. The core networking requirements for DreamCompute are Layer 2 tenant isolation, IPv6 and 10G+ \u201ceverywhere.\u201d\nDreamHost has about 400,000 customers. The provider was all in on NSX less than three years ago.\nThe first generation of the DreamCompute networking infrastructure included Nicira\u2019s NVP network virtualization software for Layer 2 isolation, and Cumulus Linux as the network operating system running on white box switches. Layer 3 requirements were not met by Nicira NVP nor by software routing vendors who did not understand cloud, said Mark McClain, Akanda CTO.\nThe second generation of the DreamCompute network include Layer 3 capabilities in VMware NSX, which acquired Nicira, renamed the NVP product and enhanced it. But in a bake-off with the Astara open source network orchestration service for OpenStack \u2013 which was developed by DreamHost -- Astara comes out on top and, with some enhancements, allows DreamCompute to scale to over 1,000 customers and thousands of VMs.\n\u201cHonestly, we expected Astara to lose this challenge,\u201d states Jonathan LaCour, DreamHost vice president of cloud and development, in his blog. \u201cHowever, Astara absolutely came out victorious, offering a significantly better experience and more reliability.\u201d\nIn the third generation of the DreamCompute infrastructure, NSX was found to have scale limitations of 1,250 tenants. Open vSwitch was slow and unstable, and the software was difficult to debug and operate, the presenters said. As a result, NSX was replaced for Layer 2 isolation by hardware accelerated VXLAN in the switch and hypervisor, and by Astara for Layer 3-7 service orchestration.\nCumulus Linux remained as the physical underlay for the DreamCompute network.\nAstara virtual network appliances allowed for easy scale, while VXLAN tunnels scaled \u201cmassively,\u201d presenters said. Astara also simplified OpenStack Neutron networking deployments by requiring fewer Layer 2, DHCP and advanced services agents, and is generally easier to operate because it, VXLAN and the Linux networking stack on DreamCompute switches are \u201copen\u201d and familiar, presenters said.\n\u201cAs far as performance and scale, DreamCompute is breaking through those limits we met with VMWare NSX,\u201d LaCour states in his blog. \u201cThis is largely due to reductions in complexity, thanks to management and automation through OpenStack and Astara.\u201d\nVMware wouldn\u2019t comment specifically on the DreamHost project but through a spokesperson said it is \u201cvery happy with the success\u201d NSX has had in some of the largest OpenStack environments in the world, \u201cas well as our track record in open networking through things like the Open vSwitch project.\u201d\nDreamHost\u2019s project mirrors that of other cloud and Webscale providers, like Google and Facebook, that have opted to develop their own networking solutions to overcome the limitations of commercial offerings, and reduce capex and opex. That open source provides such a significant capex improvement over commercial products should perhaps come as no surprise.\nBut the opex reduction might be the proof point that familiar open source code, customized for specific operator requirements, is just as capable \u2013 if not more so \u2013 than commercially available, vendor-integrated products.\nAT&T is also considering open sourcing its internally developed service orchestration software.