Juniper Networks supports SDN with Contrail Networking, a solution that provides dynamic end-to-end networking policy and control for any cloud, any workload, NFV, and any deployment, from a single user interface. It translates abstract workflows into specific policies, simplifying the orchestration of virtual overlay connectivity across all environments.
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VMware NSX
Score 8.6 out of 10
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VMware NSX is network virtualization technology. VMware NSX is no longer sold as a standalone product and is now available as a part of VMware Cloud Foundation.
Contrail is best [suitable] for Service Provider having [multiple outlay protocol] support. Both Contrail and NSX fulfill all requirements for DC Networking, NFV Cloud, and Private Cloud Networking requirements. Cisco ACI is more relevant towards Enterprises.
With proper design, VMware NSX can and should be deployed to virtually any VMware virtualization environment, but the deployment should be tailored to the needs of that environment. There isn't really a one size fits all deployment design for all environments. That versatility is what provides its greatest strength to a business.
The platforms are very similar in networking concepts, at the interface level I found it easier to use Juniper Contrail than Cisco ACI. And at the cost level, I think it is cheaper.
We use both Cisco ACI and VMware NSX, and while they have different strengths and capabilities, I would recommend VMware NSX, as it can be used in all VMware environments, without costly physical infrastructure changes. Cisco ACI provides some of the same capabilities, but not all. It's focus relies on physical networking changes.