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Distributed vnf management architecture and use-cases


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Sridhar Pothuganti, NXP, Trinath Somanchi, NXP

Telco operators are on journey to discover what virtualization means for the network. Markets have believed that NFV architecture elements: NFVI and VIM, hold the complete responsibility in providing virtualized networks with carrier grade properties.

Telco operators have reached to a conclusion that VNFs must take their fair share of responsibility to realize NFV goals while meeting carrier-grade behavior in the entire NFV architecture. While the trend moves on, Cloud native VNFs are emerging best citizens of the cloud. Thus communication from EMS to VNFM is blurred and eventually may disappear in the future. This requires better understanding of, and agreement over the role of VNFMs and EMS for VNFs.

This presentation describes the evolution of Distributed VNF management, Architectural design considerations and Use-case scenarios. The following proposal is based on a comprehensive study on evolving cloud native VNF management.

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Distributed vnf management architecture and use-cases

  1. 1. Distributed VNF Management Architecture and Use cases Sridhar Pothuganti Trinath Somanchi INDIA
  2. 2. Session Outline • NFV - Benefits • NFV deployment models. • Role of VNF Manager. • Understanding em-vnf-vnfm • Future VNFs. • VNF Management – Tomorrow • Distributed VNF Management – Overview. • State and Operational Flow. • Benefits and Use-cases
  3. 3. NFV - Benefits Reduced operator CAPEX and OPEX through reduced equipment costs and reduced power consumption Reduced time-to-market to deploy new network services Improved return on investment from new services Greater flexibility to scale up, scale down or evolve services Openness to the virtual appliance market and pure software entrants Opportunities to trial and deploy new innovative services at lower risk Network Function Virtualization – Benefits
  4. 4. Evolving Telco needs 1900-1990s 1960-2000s 2000-2010s Today Future Time  Value Physical (Copper/Fiber/Radio) Physical (Copper/Fiber/Radio) Physical (Copper/Fiber/Radio) Physical (Copper/Fiber/Radio) Physical (Copper/Fiber/Radio) Voice Voice Voice Voice Voice SMS SMS Data (Internet/IP) SMS SMS Data (Internet/IP) Data (Internet/IP) Distributed Telco Cloud Centralized Platforms PaaS, IaaS etc.. Service/Content SaaS Centralized Platforms PaaS, IaaS etc.. Service/Content SaaS
  5. 5. NFV Deployment Models VNFVNFVNF Customer Premises CSP Network CSP PoP (CO/DC) Virtual Network Functions located at CSP PoP Centralized Model • All Virtualized functionality located at CSPs PoP (DC/CO). • VNFs deployed using existing networks. • Carrier Ethernet is ideal for providing access to centralized VNFs from the customer premises • Basic Switch/Router at the customer premises. • Heavy reliability on the cloud and network performance. Customer Premises CSP Network Virtual Network Functions located at Customer Premises Decentralized Model VNFVNFVNF Customer Premises VNFVNFVNF • All Virtualized functionality located at Customer Premises. • Requires augmenting CP equipment. • No VNFs in the Data center. • Facilitates traffic handling and offloading to hardware-based processing. VNFVNF Customer Premises CSP Network CSP PoP (CO/DC) Virtual Network Functions distributed between Customer premises and CSP PoP Distributed Model VNFVNFVNF • Network functionality distributed between CSP’s PoP and CPE. • VNFs can be deployed based on optimal feasibility, performance, reliability, scalability and cost considerations. • VNFs can be dynamically ordered, configured and chained as per the requirement. Distributed Model – (Edge NFV) VNFVNF CSP Network CSP PoP (CO/DC) Virtual Network Functions distributed between Customer premises, Gateways/Aggregation points and CSP PoP Customer Premises VNFVNFVNF • Network functionality distributed between CSP’s PoP, Cloud edge and CPE. • Extending Multi-DC management to address many small "DC" locations. Customer Premises VNFVNFVNF Aggregation Network Edge VNFVNFVNF
  6. 6. Role of VNF Manager Instantiate Scale Scale VNF to level Change VNF Flavor TerminateQuery VNF Heal VNF Operate VNF Modify VNF Virtual Network Function • VNF Instantiation and Termination. • Monitoring Health and Performance indicators. • Scaling and healing. • Interface to Vendor specific EMS. • VNF Image update management. • Manage group of VNFCs belonging to the same VNF instance. VNF Managers are seen tightly coupled with other MANO components. But they are intended to be loosely coupled and have distributed implementation scope. Reference: [ETSI GS NFV-IFA 008 V2.1.1 (2016-10)] Network Functions Virtualisation (NFV); Management and Orchestration; Ve-Vnfm reference point - Interface and Information Model Specification
  7. 7. Understanding em-vnf-vnfm • Element Management System (EMS) manages the VNFs in co-ordination with VNFM. • Ve-Vnfm-em – Provides the Interface for EMS to support various operations (LCM, Fault, Performance, Configuration etc..) produced by VNFM. • EMS are specific to the VNFs and are provided by VNF vendors. • EMS act as VNF specific managers by supporting various operations from VNFM. • Ve-Vnfm-Vnf – Provides interface for VNF to support various operations produced by VNFM. • Provides a direct communication to VNF management. Reference: [ETSI GS NFV-IFA 008 V2.1.1 (2016-10)] Network Functions Virtualisation (NFV); Management and Orchestration; Ve-Vnfm reference point - Interface and Information Model Specification While VNF Centric management approach is a required, VNFMs can take fair share in managing VNFs. Moving forward, VNFMs will need to manage multi vendor VNFs. Standardized specification is still in literature. VNFM EMS VNF Ve-Vnfm-em Ve-Vnfm-vnf ElementManagementSystem VirtualNetwork Function
  8. 8. Future VNFs Containerized VNFs • Reduced Overhead Microservices, • which enables service composability, reusability, efficient scaling and ease of deployment Stateless processing • Makes cloud VNFs fault tolerant and scalable without notional limits – Application isolated from state. Easy Orchestration • VNFs are designed to minimize the amount of configuration needed in each component. Monolithic VNF •VNF combined with all the components Minimal Reuse •VNFC level re-usability is minimal or no Stateful •The states are tightly coupled with the packet processing unit itself, Orchestration •VNF orchestration is dependent on VNF Complexity. CN-VNFVNF
  9. 9. VNF Manager - Tomorrow Today … Tomorrow.. VNF Management Centralized Distributed NFV, Edge NFV is evolving. VNF management must change scope. VNF/EMS/VNFM from single providers Complex decomposed VNFCs from multiple providers EMS to manage VNFs EMS based VNF management faded. VNFMs to managed decomposed shared VNF(C)s. Security management centralized Distributed Security management - VNF and NS centric. Intelligent VNFs – Still in literature Intelligent VNFs – a Reality With the adoption of VNF decomposition to microservices and evolving Telco needs, Cloud Edge and Customer premises equipment management requires localized control for low latency and Service agility. This expands the view of VNF management.
  11. 11. D-VNFM - Architecture D-VNFM Data analytics/Learning Interface Resourcemgmt.Interface (Vi-Vnfm) Fault Management Interface Config Management Interface Security Management Interface Performance Management interface Orchestration.Interface (Or-Vnfm) VNF LCM/Elastic Interface (Ve-Vnfm-vnf) Localized Policy Store Localized Key Store Light weight VNF Manager Localized VNF management. Logical Zone – Security management. Integration to external applications. VNFC specific FCPS management
  12. 12. VNF LCM/Elastic Interface (ve- Vnfm) Basic VNF lifecycle management, On- demand scale in/out and auto- healing of VNFs. Resource Management Interface (Vi-Vnfm) Store and provide VNF deployment specific resource information (Faulty resource, Performance metric, Resource reservation) Orchestration interface (Or- Vnfm) As Generic VNFM, communicates with NFVO for on- demand resource allocation and VNF specific requirements Distributed Policy Store Stores the Flow, security policy, healing and monitoring policies and performance upgrade rules. Distributed Key Store Stores the key and certificates required for cryptography. FCPS Management Interface VNFC Centric FCPS management. Data analytics/Learning interface Provision external data/machine learning systems and query policies to enable intelligent VNFs (means to self-auto-scale and self-auto-heal provided VNF supports additional functionality inclusion). D-VNFM – Functional Blocks
  13. 13. Authorized Agent VNFs NFVODistributed VNFM VIM External Apps 1. VNF Instantiation 1.1 Grant Lifecycle Operation 1.2 Check Policies and Resource Availability 1.3 Resource Reservation 1.4 Resource Reservation Response1.5 Ack 1.6 Allocate Resources 1.7 Ack : Allocate Resource 1.8 Configure VNF 1.10 VNF Created 1.9 Notify VNF Instantiated 2. Monitor VNF 2.2 Data Analytics/ML data 2.1 Stats feed to External Apps 2.3 Advice for VNF improvement 3. Prediction as scaling required 3.1 Grant LCO(scale, Bulk) 3.2 Check Policies and Resource Availability 3.3 Resource Reservation 3.4 Resource Reservation Response 3.5 Ack (scale, bulk) 6.6 Allocate Resources 3.7 Ack : Allocate Resource 3.8 Configure VNF 3.9 Notify Resources Utilized 3.10 Notify VNF Scaled Operational Flow 1/2 VNFInstantiationVNFImproveVNFScale
  14. 14. VNFs NFVODistributed VNFM VIM External Apps 51. Notify performance measurement results Security Engine 6.2 VNF Stats feed to External Apps 4.1 VNF Fault 4.2 Trigger Corrective Action4.3 VNF Corrective Action 4.4 VNF Fault Notification 5.2 Contraction Required 5.3 Graceful termination of VNFC 5.4 Release Resources 5.5 Ack : Release Resource 5.6 Notify Resources Utilized 5.7 Notify VNF Update 6.3 VNF vulnerability patch fix required6.4 update VNF with vulnerability patches 6.1 update VNF status Operational Flow 2/2VNFFaultManagementVNFPerformanceManagementVNFSecurity Management
  15. 15. D-VNF Management State transitions (S1) NULL (S2) On-Boarding (S3) Instantiate (S4) Configure/Halt /Reboot (S5) Active/Started (S6) Halted S1-T1) On-Boarding VNF S2-T1) Instantiate S3-T1) Scale in/Out S4-T1) Configure S4-T1) Scale In/Out S4-T2) Update S5-T1) Scale in/Out Instantiation state Configuration state Ready state S5-T3) Security Config S5-T5) Perf Config S5-T6) Perf mgmt D-VNF management aligns with VNFM for all state transitions. But is specific to VNF, Localized administrative zone
  16. 16. Customer Edge Device Management Diagram Source: CED is the first entry point from the end-user/subscriber to connect to a network and subscribe a specific service. Legacy CED, are deeply hardware and software coupled and recently IPTV, VOIP, remote storage was introduced making CEDs more sophisticated. Today CEDs are made more intelligent with NFV, there by dynamically provision new services into CEDs. D-VNFM is a best fit solution to provision, manage and monitor VNFs with improved service security, reliability and proactive resource management. Since IoT is moving fast in residential market, DVNFM can improve overall deployment flexibility and generate potential benefits to the complete ecosystems
  17. 17. Intelligent VNF With advent of data analytics and machine learning it’s possible to foresee the improvements needed to manage the networks with experience from existing data. This requires a local management of VNFs and their underlying networks and infrastructures. Distributed management of VNFs using analytical tools paves a new path for sophisticated and intelligent management of resource. This helps improve fault tolerance, better availability and resiliency at complete infrastructure. Since VNFs are split into fine granular VNFCs integration with Data Analytics/learning systems will surely benefit the ecosystem.
  18. 18. D-VNFM - Benefits ✓Efficient, localized and unique services for VNFs ✓Managing different VNFs from different VNF vendors ✓VNFC and Network Service Centric Security management. ✓VNF management in and across trust domains. ✓Using DA/ML for effective utilization of VNFs and resources ✓Fast instantiation and increase resource utilization ✓Agile VNF software upgrade ✓Addressing E2E automation Improved Fault Management Security Hardened VNFs Speedy Configuration Management Data Analysis and learning – On the Fly VNF Centric Resilient environment Improved VNF Elasticity Quality assurance – Economics -
  19. 19. Future work • Detailed Design and architecture. • PoC with ETSI proposed use-cases. • API definitions and Communication end point design. • Plugin architecture for External app integration. • Realizing with OpenStack modules.
  20. 20. That’s all folks. For Questions/Discussion Sridhar Pothuganti Email: IRC : SridharP Trinath Somanchi Email: IRC : trinaths Thank you all.