OpenFlow, SDN, and NFV

2024-08-28 15:31:16

OpenFlow

An open standard to innovative protocols in production networks
- provides a standardized hook to allow us to run experiments, without requiring vendors(供应商) to expose the internal workings of their network devices
The standard communications interface defined between the control and forwarding(转发) layers of an Software-Defined-Network (SDN) architecture

The Evolution

OpenFlow Architecture

Separate datapath and control path
Programmability(可编程)
- Enable innovation/differentiation
- Accelerate new features and services introduction
Abstraction
- Decouple: Hardware & Software
- Control plane & forwarding,
- Physical & logical configuration
Centralized Intelligence

General Misconceptions

SDN is:
- OpenFlow?
- Standard southbound API?
- Centralization of control plane?
- Separation of control and data plane?
Is sdn a mechanism?
In reality, SDN is a framework to solve a set of problems while OpenFlow is an open API that provides a standard interface for programming the data plane switches.

What is SDN?

Centralization of control of the network via,
Separation of control logic to off-device compute, that
Enables automation and orchestration of network services via,
Open programmatic interfaces.

SDN Benefits

Efficiency
- optimize existing applications, services and infrastructure
Scalability(可扩展性)
- rapidly grow existing applications and services
Innovation
- create and deliver new types of applications and services and business models

Why do we need SDN?

Network virtualization (datacenter and cloud)
Orchestration (cloud)
Programmable (enterprise)
Dynamic scaling (cloud)
Automation – (datacenter and cloud)

Visibility - monitor resources, connectivity
Performance (datacenter and cloud)
Multi-tenancy (data center and cloud)
Service integration (Enterprise)

Network Function Virtualization (NFV)

Decouples functions like a firewall or encryption from dedicated hardware and moves the function to virtual servers.
Refers to the strategy of virtualizing network functions moving from separate proprietary(所有权) pieces of hardware to software running on virtual servers using standard hardware.

NFV Innovations

NFV and SDN Relationship

Concept of NFV originated from SDN
NFV and SDN are complementary(补充)
Both have similar goals but different approaches
Virtualization alone provides many of the required feature for both NFV and SDN

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