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Similar to NFV : Virtual Network Function Architecture (20)
NFV : Virtual Network Function Architecture
- 1. Network Function Virtualisation - VNF Architecture Neelima Sharma
- 2. The content of this presentation is taken from the ETSI NFV specifications and from various presentations available on internet
- 3. What is covered… Overview of VNF in NFV framework VNF Design Patterns and Properties VNF LifeCycle VNF Fault Management
- 4. Virtual Network Functions - Overview Software implementation of the legacy network functions Network Function capable of running over NFVI Network Function orchestrated by NFVO and VNF Manager VNF may be implemented as single network entity as per standards VNF may be implemented as group of network entities VNF provider structure the software into software components called as VNF Components (VNFC) VNF’s are implemented with one or more VNFC VNF instance map 1:1 to NFVI virtualized container interface as shown in the below slide VNF instance is the runtime instantiation of the VNF which consist of VNFC instance (VNFCI) Requirements for the initial deployment are defined in VNF descriptor (VNFD) A VNF can generally be assumed to be packaged by a single VNF provider
- 5. Virtual Network Functions – Functional View Below figure illustrates the functional view of VNF
- 6. Virtual Network Functions – Interfaces Interface is a point of interaction between two entities ESTI refers interfaces as reference point There are 5 interfaces as shown the figures SWA-1 Interface for communication between two VNF’s Connect various VNF in a forwarding graph Represent data/control plane interfaces of the NF (VNF,PNF) VNF may support one or more VNF SWA-2 Interface internal to the VNF for communication between VNFC Vendor specific Logical interface which makes use network connectivity services available at SWA-5 interface SWA-3 : Interface for communication between VNF and VNF Manager SWA-4 : Interface for communication between VNF and EMS SWA-5 : Interface for communication between VNF and NFVI
- 7. Virtual Network Functions – Interfaces There are 5 interfaces as shown the figures SWA-3 Interface for communication between VNF and VNF Manager Management interface to perform the life cycle management of VNF Interconnection attributes like for IP/L2 connectivity SWA-4 Interface for communication between VNF and EMS Runtime management of VNF according to the fulfilment, assurance and billing FAB and FCAPS SWA-5 Interface for communication between VNF and NFVI container Provide virtualized slice of NFVI resources allocated to the VNF It has sub-interfaces to perform specific set of uses, roles and type of inter-connection attribute
- 8. Virtual Network Functions – Interfaces
- 9. Virtual Network Functions – Interfaces
- 10. Virtual Network Functions – Design and Properties This slides further are divided further as Internal structure Life Cycle VNFC states Load Balancing
- 11. Virtual Network Functions – Internal Structure
- 12. Virtual Network Functions - Instantiation There are two ways to achieve this Parallelizable Instantiation multiple time per VNF instance but with constraints on the number Non-Parallelizable Instantiation once per VNF instance
- 13. Virtual Network Functions - States StateFul VNFC VNFC that needs to handles state information of the VNF VNFC can be implemented stateless by storing the state in the external repository to VNFC Stateless VNFC VNFC that does not need to handle the state information
- 14. Virtual Network Functions – Load Balancer VNF - Internal Load Balancer 1 VNF instance seen as 1 logical NFV by peer NF VNF has atleast one VNFC which can be replicated Internal load balancer VNFC which scatters/collects information/packets/flows/session to/from the different VNFCI VNF – External Load Balancer N VNF instance seen as 1 logical NFV by peer NF External load balancer which will be another VNF which scatters/collects information/packets/flows /session to/from the different VNF instances
- 15. Virtual Network Functions – Load Balancer End-to-End Load Balancing N VNF instance seen as N logical NFV by peer NF Peer NF itself contains load balancing functionality If VNFs contains the state information then the LB NF shall direct flows to the VNF instance that has the appropriate configured/learned state. Infrastructure Load Balancer
- 16. Virtual Network Functions – VNF Scaling Auto Scaling VNF manager triggers the scaling based on rules in VNFD Both scale out/in and scale down/up may be supported On demand Scaling VNF contains resource controller functionality to monitor KPI and trigger the scaling of VNFs Both scale out/in and scale down/up may be supported Scaling based on management request Manually triggered scaling OSS/BSS triggered scaling based on rules in VNFD via NFVO
- 17. Virtual Network Functions – VNF Update and Upgrade VNF Update Does not introduce new functionality and/or new interfaces Methods for updating can differ from vendor to vendor Automatic procedure to start the update which is controllable and perform the roll-back on failure VNF Upgrade Might introduce new functionality and/or new interfaces Methods for updating can differ from vendor to vendor Automatic procedure to start the update which is controllable and perform the roll-back on failure
- 18. Virtual Network Functions – VNF Properties Hardware Independence COTS-Ready Partly COTS-Ready Hardware dependent Virtualization and Container Awareness Hypervisor agnostic Hypervisor dependent Operating system containers Higher layer container technologies Not virtualized and no container technology Partly virtualized
- 19. Virtual Network Functions – VNF Properties Elasticity No elasticity Elasticity by scaling up/down only Elasticity by scaling in/out only Elasticity in either dimension VNF Policy Management Fully policy based VNF Not policy based VNF Migration Operations No live migration supported Live migration supported Migration partially supported Other migration mechanisms
- 20. Virtual Network Functions – VNF Description (VNFD) Definition : “The template captures the general characteristics of each VNF and is used to on-board the VNF, in order to support on demand instantiation of the VNF’s in an operator’s network. “ VNFD Composition VNF identification data Data to uniquely identify the VNF vendor/provider Type and description of the VNF Version VNF specific data Specific VNF configuration data Connectivity requirements and inter-dependencies of VNFCs VNF lifecycle workflow scripts Deployment flavours
- 21. Virtual Network Functions – VNF Description (VNFD) VNFC Data VNF identification data Type and identification Specific VNFC configuration data and scripts. Deployment constraints Virtual container files/images references VNFC binaries plus operating system Empty operating system, and/or Empty virtual container (i.e., unloaded operating system) Virtualized Resource requirements Compute Resources Storage Resources Network Resources
- 22. Virtual Network Functions – VNF Life Cycle
- 23. Virtual Network Functions – VNF Instantiation Process
- 24. Virtual Network Functions – VNF Instantiation Process VNFD Details
- 25. Virtual Network Functions – VNF Fault Management VNF fault management includes Fault Detection Fault localization Fault reporting Faults involving the virtualized resources allocated and consumed by VNF Faults within a VNF Virtualized Resource Faults Fault in virtualized resources that might affect a VNF’s proper functioning Fault in the VNF’s redundancy scheme Fault in the Vn-nf/SWA-5 interface Faults concerning the virtualization container connectivity
- 26. Virtual Network Functions – VNF Fault Management VNF Faults Software bug related faults Communication failures among VNFC’s Security faults VNF configuration failures
- 27. THANK YOU !!!!