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Network Function Virtualisation - 
Use Cases, Architecture, Virtualisation 
Req 
Neelima Sharma
The content of this presentation is taken from the ETSI 
NFV specifications and from various presentations 
available on i...
What is covered… 
 Why and What NFV ? 
 Use cases of NFV 
 NFV architecture framework 
 Virtualisation Requirement
Basic Requirement To Understand NFV …….. 
 Understanding about concept of virtualization 
 Orchestration 
 Management 
...
Trends in Networking 
 Network Functions are vendor specific and binded to the vendor 
hardware 
 New virtualization tec...
Challenges 
 Huge capital investment to deal with current trends 
 Network operators face an increasing disparity betwee...
NFV – Why? 
 Answer to Why is to resolve all the challenges listed. 
 To remove the constraints of hardware to the netwo...
NFV – What ? 
 From Wikipedia definition of NFV is as mentioned below 
(en.wikipedia.org/wiki/Network_Functions_Virtualiz...
NFV – What ?
ETSI NFV ISG WG Structure 
Technical Steering Committee 
Performance & Portability 
Chair: Francisco Javier Ramón 
10 
Wor...
NFV Specifications – Reference 
 NFV Use Cases (GS NFV 001) 
 NFV Architectural Framework ( GS NFV 002) 
 Terminology f...
NFV Use Cases 
Focused on …. 
 Network Function Virtualisation Infrastructure as a Service ( 
NFVIaaS) 
 Network Functio...
Network Function Virtualisation Infrastructure as a 
Service ( NFVIaaS) 
 Infrastructure as a Service 
 Cloud service 
...
Network Function Virtualisation Infrastructure as a 
Service ( NFVIaaS)
Network Function Virtualisation Function as a Service ( 
NFVFaaS) 
 Functions as a Service 
 Services deployed at the ed...
Network Function Virtualisation Function as a Service ( 
NFVFaaS) -vEPC 
 Examples of Network 
Functions include MME, 
S/...
Network Function Virtualisation Platform as a Service ( 
NFVPlPatfaoarmS a)s a Service 
 Make the suite of infrastructur...
VNF Forwarding Graphs 
 VNF Forwarding Graphs 
 Defines the sequence of Network Functions that the packet 
traverse 
 A...
VNF Forwarding 
Graph 
VNF FG Logical View 
VNF FG Physical View
NFV Architecture Framework 
Service, VNF and Infrastructure 
Description 
EMS 1 EMS 2 EMS 3 
Virtual 
Computing 
c NEC Cor...
NFV Layers 
Network Service 
VNF VNF 
VNF VNF VNF 
VNF Instances 
VNF VNF VNF 
VNF 
NFV Infrastructure 
End 
Point 
End 
P...
NFV Framework Scope 
 Decoupling software from hardware 
 Flexible network function deployment 
 Dynamic Operation 
 T...
Functional Blocks of NFV Framework 
 Virtual Network Function (VNF) 
 Virtualisation of a network function. Ex : DHCP, F...
Functional Blocks of NFV Framework 
 Virtualised Infrastructure Manager 
 Resource management : Inventory of S/W, alloca...
NFV- Virtualisation Requirements 
 General 
 The framework should facilitate to providers/operators to 
partially or ful...
NFV- Virtualisation Requirements 
 Performance 
 Framework should be able to define the underlying 
infrastructure and V...
NFV- Virtualisation Requirements 
 Security 
 Framework to protect data, security vulnerabilities, protection of new 
in...
NFV- Virtualisation Requirements 
 Service Continuity 
SLA defined service continuity requirement should be 
supported i...
NFV- Virtualisation Requirements 
 Energy Efficiency 
 Framework should provide the capability to place the VNF 
subset ...
NFV- Virtualisation Requirements 
 Management and Orchestration 
 Responsible for VNF and VNF instances lifecycle manage...
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Network Function Virtualization : Overview

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Network Function Virtualization : Overview

  1. 1. Network Function Virtualisation - Use Cases, Architecture, Virtualisation Req Neelima Sharma
  2. 2. The content of this presentation is taken from the ETSI NFV specifications and from various presentations available on internet
  3. 3. What is covered…  Why and What NFV ?  Use cases of NFV  NFV architecture framework  Virtualisation Requirement
  4. 4. Basic Requirement To Understand NFV ……..  Understanding about concept of virtualization  Orchestration  Management  Operations, resource sharing  Understanding about the networks and cloud computing  Networking devices and functionalities supported  Datacenter networks, service provider networks  Cloud networks and types  Understanding about the concept of SDN  Openflow  Openflow controller
  5. 5. Trends in Networking  Network Functions are vendor specific and binded to the vendor hardware  New virtualization technologies that abstract underlying hardware yielding elasticity, scalability and automation  Cloud network and service emergence  Software defined networking technique emergence  Mobility, Security, large scale networks
  6. 6. Challenges  Huge capital investment to deal with current trends  Network operators face an increasing disparity between costs and revenues  Complexity: large and increasing variety of proprietary hardware appliances in operator’s network  Reduced hardware lifecycles  Launching new services is difficult and takes too long  Manual effort at various levels and locations for management of the networks and operations
  7. 7. NFV – Why?  Answer to Why is to resolve all the challenges listed.  To remove the constraints of hardware to the network functions ( free the software ) - Virtualisation  Reduce Opex  Reduce Capex  Enable innovation  Deliver agility and flexibility  transform the way network operators architect and operate their networks – Orchestration  Dynamic scaling  Automation  Visibility  Performance  Multi-tenancy
  8. 8. NFV – What ?  From Wikipedia definition of NFV is as mentioned below (en.wikipedia.org/wiki/Network_Functions_Virtualization) Network Functions Virtualization (NFV) is a network architecture concept that proposes using IT virtualization related technologies, to virtualize entire classes of network node functions into building blocks that may be connected, or chained, together to create communication services.
  9. 9. NFV – What ?
  10. 10. ETSI NFV ISG WG Structure Technical Steering Committee Performance & Portability Chair: Francisco Javier Ramón 10 Working Group Architecture of the Virtualisation Infrastructure Co-Chairs: Steve Wright (ATT) + Yun Chao Hu (HW) Working Group Management & Orchestration Co-Chairs: Raquel Morera (VZ) + vacant Working Group Software Architecture Co-Chairs: Fred Feisullin (Sprint) + Marie-Paule Odini (HP) Working Group Reliability & Availability Co-Chairs: Naseem Khan (VZ) + Markus Schoeller (NEC) Expert Group Salguero (TF) Expert Group Security Chair: Igor Faynberg (ATT) Chaired by Technical Manager : Don Clarke (BT) Assistant Technical Manager : Diego Lopez (TF) Other members: ISG Vice Chair + WG Chairs + Expert Group Leaders Programme Managers : Zong Ning (Huawei), Francois Menard (Aeponyx) BT = British Telecom HW= Huawei TF = Telefonica VZ = Verizon
  11. 11. NFV Specifications – Reference  NFV Use Cases (GS NFV 001)  NFV Architectural Framework ( GS NFV 002)  Terminology for Main concept in NFV ( GS NFV 003)  NFV Virtualization Concept ( GS NFV 004)  NFV Proof of Concept Framework ( GS NFV –PER 002)
  12. 12. NFV Use Cases Focused on ….  Network Function Virtualisation Infrastructure as a Service ( NFVIaaS)  Network Function Virtualisation Platform as a Service ( NFVPaaS)  Network Function Virtualisation Function as a Service ( NFVPaaS)  VNF Forwarding graphs Others ……..  Virtualisation of Mobile core network and IMS  Virtualisation of the mobile base station  Virtualisation of the home environment  Virtualisation of the vCDN’
  13. 13. Network Function Virtualisation Infrastructure as a Service ( NFVIaaS)  Infrastructure as a Service  Cloud service  Sharing/Pooling of resources by various Virtualised network functions (VNF’s)  NFV infrastructure to run the VNF instances  Reliability, Latency  Network Function Virtualisation Infrastructure  Remote deployment and management of VNF in the infrastructure of other service provider  Providing this as service to customer to provide the environment to run their respective VNF’s.  Elements of NFVIaaS IaaS : Infrastructure as service NaaS : Network as service
  14. 14. Network Function Virtualisation Infrastructure as a Service ( NFVIaaS)
  15. 15. Network Function Virtualisation Function as a Service ( NFVFaaS)  Functions as a Service  Services deployed at the edge of the branch offices  Control of cost by virtualizing the services to be provided by service provider  Services and applications migrating to enterprise DC or public clouds  Ex : vCPE, vEPC, vRouter ……  Benefits of NFVFaaS  Modest Software tool footprint to access the service  Efficient use of software license  Centralized management and data  Savings in up-front costs
  16. 16. Network Function Virtualisation Function as a Service ( NFVFaaS) -vEPC  Examples of Network Functions include MME, S/P-GW, etc  This use case aims at applying virtualization to the EPC, the IMS, and these other Network Functions mentioned above
  17. 17. Network Function Virtualisation Platform as a Service ( NFVPlPatfaoarmS a)s a Service  Make the suite of infrastructure and applications as a platform on which the enterprise can deploy their network applications  Flexibility to share resources by the service provider  Decrease the setup and management costs  Toolkit for conveniently developing, deploying and administering application software which supports large subscribers, process large quantities of data and potentially accessed via Internet  NFVPaaS is differs from NFVFaaS only in terms of scale of the service and programmability  Email Server hosting as examples :  Hosting of the Email server on the VNPaaS without any configuration by service provider for an enterprise  Enterprise has full admin control and performs the configurations  Enterprise can host another VNF instances connected to the email server for specific functions
  18. 18. VNF Forwarding Graphs  VNF Forwarding Graphs  Defines the sequence of Network Functions that the packet traverse  Analogue of connecting existing physical appliances via cables  Provides the logical connectivity between virtual appliances (i.e. VNF’s)  Network services are realized using VNF FG and then deploy them in instantiations bound to particular NFVI resources.  VNF FG can be connected to the physical Network Functions
  19. 19. VNF Forwarding Graph VNF FG Logical View VNF FG Physical View
  20. 20. NFV Architecture Framework Service, VNF and Infrastructure Description EMS 1 EMS 2 EMS 3 Virtual Computing c NEC Corporation 2014 Orchestrator Or-Vnfm VNF Manager(s) Vi-Vnfm Page 9 Computing Hardware OSS/BSS Vn-Nf Virtual Storage Vl-Ha Storage Hardware Virtual Network Hardware resources Network Hardware Virtualisation Layer Virtualised Infrastructure Manager(s) VNF 2 NFVI VNF 1 VNF 3 Or-Vi Os-Ma Se-Ma Ve-Vnfm Nf-Vi Execution reference points Other reference points Main NFV reference points
  21. 21. NFV Layers Network Service VNF VNF VNF VNF VNF VNF Instances VNF VNF VNF VNF NFV Infrastructure End Point End Point E2E Network Service Virtual Compute Virtual Storage Virtual Network Logical Abstractions Logical Links SW Instances VNF : Virtualized Network Function Virtual Resources Virtualization SW Virtualization Layer HW Resources Compute Storage Network
  22. 22. NFV Framework Scope  Decoupling software from hardware  Flexible network function deployment  Dynamic Operation  Three main domains focused in the framework definition  VNFs which are software implementation of the network functions  NFVI including diversity of physical resources and how they can be virtualized  NFV management and orchestration which focuses on all virtualization specific management task necessary in the NFV framework
  23. 23. Functional Blocks of NFV Framework  Virtual Network Function (VNF)  Virtualisation of a network function. Ex : DHCP, Firewall, DPI,  VNF can be composed of single/multiple internal component  Element Management System (EMS)  Systems to perform the management functionality for one or several VNFs.  Network Function Virtualisation Infrastructure (NFVI)  All hardware and software involved to build environment for VNF deployment  Span across multiple locations  Virtualisation Layer  Abstracting and logically partitioning the physical resources  Enabling the software that implements the VNF to use the underlying virtualized infrastructure  Providing virtualized resources to the VNF
  24. 24. Functional Blocks of NFV Framework  Virtualised Infrastructure Manager  Resource management : Inventory of S/W, allocation of virtualization enablers, Mgmt. of infrastructure resource and allocation  Operations : Visibility and mgmt. of the NFVI, RCA of performance issues, collection of infrastructure fault information, collection of information for planning, monitoring and optimization  Orchestrator  For management and orchestration of NFVI, software resources and realizing network services on NFVI  VNF Manager  Required for VNF lifecycle management ( e.g. instantiation, update, query, scaling, termination)  Service, VNF and Infrastructure description  Operation and Business support system (OSS/BSS)
  25. 25. NFV- Virtualisation Requirements  General  The framework should facilitate to providers/operators to partially or fully virtualize the NF needed to create, deploy and operate the service they provide.  In case of partial virtualization impact on performance or operation of non-virtualised NF should be manageable  Framework should support both PNF and VNF as a VNF forwarding graph.  Portability/Interoperability  Framework should allow load, execute and move VNF across multivendor environments  Framework should support interface to decouple VNF software’s from underlying infrastructure  Framework should be capable of location, reservation and allocation of required resources of VNF’s
  26. 26. NFV- Virtualisation Requirements  Performance  Framework should be able to define the underlying infrastructure and VNF needs to align to the performance requirements of the standard  Framework should be able to collect the performance readings  Elasticity  Framework should define the model for parallel execution of the instances  Framework should support scaling as per SLA’s and it will be depend on the policies definition in framework
  27. 27. NFV- Virtualisation Requirements  Security  Framework to protect data, security vulnerabilities, protection of new interfaces, isolation of distinct VNF set, secure management of VNF sets  Framework to share the mechanism to control and verify the configuration of the elements that virtualise hardware resource.  AAA support  Resiliency  Framework should provide mechanism to recreate the NF after failure  Framework should support standard based replication of state data and preservation of the data integrity  For network stability framework should measure the metrics defined in SLA’s like packet loss rate, drop of stable calls or sessions, latency, delay and so on.
  28. 28. NFV- Virtualisation Requirements  Service Continuity SLA defined service continuity requirement should be supported in the framework  Management Model Framework should facilitate the necessary actions to assure long life cycle of the infrastructure services Framework should provide means for exchange of firmware and software of all domains Framework to monitor logs, report all changes
  29. 29. NFV- Virtualisation Requirements  Energy Efficiency  Framework should provide the capability to place the VNF subset to sleep state for particular resources so that power conserving state.  Authorized entity to control and optimize energy consumptions  Time frame definition for power states for each resources.  Migration and co-existence with existing platforms  NFV framework shall co-exist with the legacy network equipment’s  Framework should support transition path from PNF to standardized VNF
  30. 30. NFV- Virtualisation Requirements  Management and Orchestration  Responsible for VNF and VNF instances lifecycle management  Maintain the integrity of each VNF instance w.r.t its allocated NFVI resources  Operations  Mechanism for automation of operational and management functions  Network Stability

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