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Software Defined Networking - Overview

Software-defined Networking (SDN) is the result of a multi-year collaboration among Stanford University, T-Labs and other leading institutions.

It addresses a set of problems owing to infrastructure complexity, inflexibility, and high costs. Several carriers and vendors are on board with the technology.

SDN enables mobility of encapsulated Application landscapes without any changes and offers a new model for improved programmability and control of the network infrastructure.

New services can be realized by programming instead of re-architecting the network.

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What Is Network Virtualization?An Analogy to Compute Virtualization.

Physical Compute & Memory(HP, Cisco, Dell, IBM, Quanta,…)

Server Hypervisor

Requirement: x86

Virtual Machine

Virtual Machine

Virtual Machine

x86 Environment

Decoupled

Application Application Application

Physical Network(Arista, Cisco, Brocade, Juniper, Cumulus,…)

Virtualized Network

Requirement: IP Transport

Virtual L2 Network

Virtual L3 Network

Virtual L3 Network

L2, L3, L4-7 Network Services

Workload Workload Workload

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Solution Implementation:Introduction of Overlay Networks through SDN

Current Situation No Overlay – Tightly coupled functions in

one Network, one operations team No Flexibility, High Complexity

Creation of Overlay networks New software defined logical Network Layer Concurrent independent networks Separated operation teams

Simplifications with Overlay Network Massively reduced complexity in Underlay Application Landscapes encapsulated in

Overlay including networking Services fully mobile Application Landscapes

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The Challenge

Traditional Multitier Application Landscape

No clear boundaries, no grouping, infrastructure is managed, not Application Landscape

Network Addressing implies location

Tightly coupled to hardware, Landscape not mobile within Infrastructure

Multitenancy through VLANs which are scarce

No programmatic control of Network by Application

VLAN

Front End

ApplicationLogic

Database

Context in HW FW Appliance

Context in HW LB Appliance

Routing instance (VRF)

802.1Q VLAN

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The Goal

Encapsulate, Virtualize Landscapes and Make Mobile

Fully encapsulated Application Landscapes that can freely move within Client and Service Provider Networks, without any change

App Landscape

Local Physical Dev.

Admin LAN, etc.

LegendVLAN VN-Segment (future)VXLANCustomer

Network

VXLGW

VXLGW

Router

Physical Firewall

VXLAN-to-VLAN GW

Loadbalancer

Bare Metal Servers and Storage

Virtual Loadbalancer

VM

Virtual Firewalls

Virtual Application Acceleration Services

Virtual Storage Services

Virtual Network Management

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Global Application Landscape Mobility without Change

Needs: Software Defined Networking Use of Virtualized Network Services Creation of Application Landscape abstractions (from aligned Dev. Process or Cloud Managers) Policy and Workflow Engines to implement Processes

App LandscapeVXVGW

VXVGW

App LandscapeVXVGW

VXVGW

App LandscapeVXVGW

VXVGW

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The Benefits & Use Cases

Full Application Landscape encapsulation and mobility within Client & TSI Production

Removal of network barriers, no changes to application landscapes when changing locations, either from Client to TSI Datacenter or within TSI

Enable Business with smaller Partners, ease and agility to deploy partner solutions into TSI Production, reduction of dependencies, Partner Environment can be completely isolated from TSI Network topology

Ease of operations, agility, lower risk, cost and complexity for transition/transformation. Requires changing today's network structure and operational model.

Can link Application Development Models with Production, to seamlessly instantiate and develop agile Application Landscapes