Progress report on NFV standardization in ETSI.

Transcription

1 Progress report on NFV standardization in ETSI. NetV: IRISA / Technicolor Workshop on Network Virtualization Bruno CHATRAS, Orange, ETSI NFV ISG Vice-Chairman 1

2 Agenda Overview Selected technical items 2

3 NFV is now a 4 year-old concept! The seminal white paper on Network Functions Virtualisation (NFV) signed by 13 network operators was published at the ONS conference in Darmstadt in October The first meeting of the ETSI Industry Specification Group (ISG) on NFV was held in January Today, the ISG membership has grown over 290 companies. 3

4 A short reminder about Network Functions Virtualisation (NFV) Relocating network functions from dedicated appliances to pools of generic industry servers, leveraging: - Cloud Computing Technology - Virtualisation Technologies NFV Management & Orchestration - Advances in general purpose processors performance Physical Network Function Automated installation & lifecycle management - Software images - Metadata - Supporting files Virtualised Network Function 4 distributed pools of commodity server

5 ETSI NFV Specification Releases Release 2 Looking for interoperability Release 3 Operationalizing NFV Release 1 Setting the concepts 5 PoCs Trials Large-scale deployments

6 NFV Release 2 normative deliverables Management and Orchestration Requirement specifications applicable to functional blocks Requirement specifications applicable to interfaces Requirement and information model specifications applicable to deployment templates and VNF Packaging APIs and Data Model specifications (ongoing) NFV Acceleration Requirement specifications applicable to interfaces between VNFs and a hardware-acceleration abstraction layer (still ongoing). 6 I.130 specification stages Stage 2 Stage 3

7 NFV Release 3 normative deliverables (work ongoing) NFV Acceleration NFV acceleration management interface Network Acceleration Interface NFV Management & Orchestration Architecture enhancement for Security Management Performance Measurements Software Update NFV Infrastructure Requirements for the hypervisor domain NFV Hardware requirements Performance Metrics NFV Security Security management and monitoring Security for Management & Orchestration System architecture for execution of sensitive NFV components 7

8 NFV Release 3 main ongoing studies NFV operationalization Charging, billing and accounting for NFV. Automated deployment of element management functions and other OSS functions. Management of the NFV Management and Orchestration functional blocks Multi-sites network service deployment, including connectivity across one or more WANs Creation and use of VNF snapshots for troubleshooting. License management NFV 8

9 NFV Release 3 main ongoing studies Forward-looking studies Integrating policy management in NFV Management & Orchestration Multi-domain orchestration Support of real-time/ultra-low latency aspects in NFV Support of PaaS and massively decomposed VNFs 5G Network Slicing support Guidelines for VNF design Still under discussion 9

10 Agenda Overview Selected technical items NFV Descriptors APIs and Data Models NFV Acceleration 10

11 NFV Descriptors specifications GS NFV-IFA 011 (VNFD) and GS NFV-IFA014 (NSD) makes GS NFV-MAN 001 obsolete! Similar high level structure but many differences inside Many Open Source solutions are still based on GS NFV-MAN 001 with own extensions, leading to non-compatible solutions! Major changes in VNFD w.r.t. Flavours/Profiles Scaling parameters Affinity rules 11

12 VNF Deployment Flavour Flavour = A specific deployment variant of a VNF Selects the type and number of VNFC instances to be created. QoS and Bandwidth requirements for internal virtual links Affinity and anti-affinity rules A VNF instance flavour can be changed during the VNF instance lifetime 12

13 Operating experience The scaling space (all scaling aspects) One scaling aspect with scale levels Scaling aspects A VNF may be scaled in multiple independent aspects Example - 2 aspects: DataBase, PROCessing - A scaling aspect describes in an abstracted manner what property of the VNF to scale. - A scaling aspect maps to a set of VDUs and VLDs. - Each scale level of a scaling aspect defines a valid size of the VNF w.r.t to that aspect Actual VNF sizes From red : DB=1, Proc=1 To yellow : DB=2, Proc=3 Scale Call Processor 13

14 Affinity vs Anti-Affinity rules Typically used to reduce communication latency Rules can apply Between VNFs (rules in NSD) and between VNFCs (rules in VNFD) Between instances of the same VNF(C)s or between all instances of different types of VNF(C)s Typically used to increase resilience Affinity Anti-Affinity Object Object Object Scope = Host, Zone, etc. Scope = Host, Zone, etc. 14

15 Agenda Overview Selected items NFV Descriptors APIs and Data Models NFV Acceleration 15

16 APIs, Protocols and Data Models Ongoing work o o o o Specification of a set of REST APIs applicable to the VNFM NFVO, VNFM VNF and OSS-NFVO and reference points: SOL002, 003 and 005 Specification of a TOSCA profile for the VNFD and NSD: SOL001 Specification of a VNF Packaging Format based on TOSCA CSAR: SOL004 Analysis of the gap between functional requirements applicable to the VIM northbound interfaces and Open Stack APIs 16

17 REST APIs for NFV MANO Use basic CRUD methods: POST, GET, PATCH, DELETE On a limited set of resources: VNF instances VNF lifecycle operation occurences Subscriptions Notifications Inspired from TM Forum API Design Guidelines Level 3 of the Richardson maturity model and extends with TASK resources to trigger complex operations (e.g. Instantiation, scaling) HATEOAS (Hypertext As The Engine Of Application State) features used as well. 17

18 Typical sequence diagram Task resources include Instantiate VNF Scale VNF Scale VNF to Level Change VNF Flavour Terminate VNF Heal VNF Operate VNF 18

19 Agenda Overview Selected items NFV Descriptors APIs and Data Models NFV Acceleration 19

20 Interoperability between VNFs and NFV infrastructure: The portability challenge Many VNFs need to be accelerated to deliver high performance will running on COTS servers. Hardware acceleration is a widespread solution, which today creates dependencies between the VNF and the underlying hardware Portability Performance Example The VNF is a Diameter Routing Agent IPSec processing is off-loaded to an enhanced Network Interface Card (NIC) The VNF software communicates with the NIC using a proprietary API, specific to the card model. 20

21 NFV Acceleration specifications Accelerated VNF Processing partly offloaded to the infrastructure (e.g. vswitch or hardware accelerator) Improved IP stack (e.g. DPDK-based IP stack) VNFC Instance Related Open Source projects OPNFV DPACC & OpenStack Nomad GS NFV-IFA018 GS NFV-IFA002 GS NFV-IFA019 Virtualisation layer Hardware vswitch Hardware Acceleration Abstraction layer Hardware Accelerators Virtualised Infrastructure Manager (VIM) 21 e.g. Network Interface Card (NIC) with offload capabilities

22 The Pass-through model Hardware dependencies have to be specified in the VNF Descriptor, by the VNF provider. Restricted ability to move the VNF from one server to another. 22

23 Towards an abstract model Need for abstract acceleration capabilities have to be specified in the VNF Descriptor, by the VNF provider. 23

24 Thank you 24

25 Further details ETSI NFV Technology Web page and (Drafts specifications) 25

26 High-level view of a VNF Descriptor (VNFD) contents CPU architecture Number of vcpu CPU pinning data e.g. Need for acceleration capabilities 26

27 Mapping LCM operations to HTTP verbs and task resources 27 Resource name Resource URI HTTP Method Meaning VNF instances /vnf_instances GET Query multiple VNF instances POST Create a VNF instance resource Individual VNF instance /vnf_instances/{instanceid} GET Query single VNF instance PATCH Modify VNF instance information DELETE Delete VNF instance resource Instantiate VNF task /vnf_instances/{instanceid}/instantiate POST Instantiate a VNF Scale VNF task /vnf_instances/{instanceid}/scale POST Scale a VNF instance incrementally Scale VNF to Level task /vnf_instances/{instanceid}/scale_to_level POST Scale a VNF instance to a target level Change VNF flavour task /vnf_instances/{instanceid}/change_flavour POST Change the deployment flavour of a VNF instance Terminate VNF task /vnf_instances/{instanceid}/ terminate POST Terminate a VNF instance Heal VNF task /vnf_instances/{instanceid}/heal POST Heal a VNF instance Operate VNF task /vnf_instances/{instanceid}/operate POST Operate a VNF instance VNF lifecycle operation /vnf_lc_ops GET Query list of VNF LCM operation occurrences occurrences Individual VNF lifecycle /vnf_lc_ops/{vnflcopid} GET Query single VNF LCM operation occurrence operation occurrence Subscriptions /subscriptions POST Subscribe to VNF lifecycle change notifications GET Query subscriptions Individual subscription /subscriptions/{subscriptionid} GET Query a single subscription DELETE Terminate subscription Notification endpoint (client-provided) POST Notify about VNF lifecycle change