Integrating External Controllers with ONAP. AT&T Labs
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1 Integrating External Controllers with ONAP AT&T Labs
2 Motivation Some service providers may want to leverage an alternative to an ONAP out of the box Controller (e.g., SDNC, GenNFC) for some subset of Resources. For example: There may exist some VNFs that come with their own Controller that the service provider wants to use There may exist some VNFs that leverage capabilities that the corresponding ONAP model (and hence ONAP Controller) does not yet support We see the need for a flexible approach that allows ONAP service providers to easily customize their ONAP instance to integrate External Controllers, as needed However, we recommend that External Controllers would plug in to ONAP in such a way to avoid adding complexity to the ONAP architecture 2
3 Proposed High Level Approach Note that ONAP can support external components being plugged in. E.g., VNFM. So there is no technical reason why ONAP couldn t support External Controller being plugged in. If a VNF vendor feels the need to provide their own External Controller because their VNF has needs that are not supported by the model-driven ONAP (out of the box) Controllers: The first preference should be for that VNF vendor to contribute the needed capabilities to the ONAP CCSDK to fill the functional gaps. I.e., this would eliminate the need for an External Controller. Rather, the VNF would be managed by the ONAP Controller. (The remainder of this deck assumes that the VNF vendor is either not willing or not able to do this.) The second preference would that the VNF vendor would use the ONAP CCSDK to create the base of their External Controller, and add their secret sauce to it. The third (and last) preference would be for the VNF vendor to custom-build an External Controller. To avoid complexity of the architecture, ONAP should only provide adaption to plug in external components that are of a class that exhibit well-defined functionality and APIs. E.g., ONAP can support a VNFM adaptor because the VNFM meets the ETSI standard. However, there currently exists no well-defined specification for a Controller. Thus, we will consider the ONAP Controller itself to be the de facto standard of what is a Controller, including an External Controller. Therefore it would be the responsibility of the External Controller vendor to adapt itself to meet the ONAP (out of the box) Controller definition. I.e., the External Controller must: Meet the respective ONAP (out of the box) Controller (at least run-time) APIs for the functionality they support (either natively or through adaptation). Call the necessary other ONAP APIs (e.g., A&AI) proper to the role of the respective ONAP (out of the box) Controller (see subsequent slide) 3
4 Proposed High Level Approach (Continued) Insofar that an External Controller meets the ONAP definition for a Controller, there is no need for ONAP to support an adaptor for such an External Controller; rather the External Controller can plug in to ONAP directly. An External Controller would typically replace an ONAP Controller s function only within a specific (set of) domain(s) A domain in this context is a collection of one or more Resource types (see subsequent slide) Such domain specific External Controllers are outside ONAP and as such not integrated or tested during ONAP community integration test. Rather the service provider that customizes their ONAP instance to support an External Controller would take on this integration testing. The role of other ONAP modules doesn t change in the presence of an External Controller: SDC will be used for modeling the management of Resources and Services (including on-boarding, designing and full LCM) SO will provide E2E orchestration services for all lifecycle management functions for all managed objects Obtaining and managing cloud resources will be done through ONAP multi-cloud layer A&AI will maintain inventory of all the managed Resources (controlled by External Controllers or ONAP Controllers) DCAE will collect telemetry data directly from all managed objects / services (without going through the external controllers) and provide analytic services Etc. 4
5 Integration of External Controllers Target View Theregistration of new External Controller instancesneeds to be worked through. Postregistration, the management of the mapping between Service/ Resource types and the Controller instance for each type would be handled in the same manner as any internal ONAP Controller. SDC Directed Graph Files XML (Eng Rules) Resource Onboarding Service Design Policy Creation & Validation Analytic Application Design Closed Loop Design Change Management Design Design Test & Certification Catalog Recipe/Eng Rules & Policy Distribution Network Data Model Files YANG (i.e. IPAG EMT) SDN Controller (L0-L3) Adaptation Layer Service Data Model Files - YANG (i.e.uni port) API Configuration Templates Orchestration Optional Svc Recipe API Generic NF Controllers (L4-L7) Life Cycle Management & Config Adaptation Layer Active & Available Inventory External Registry API External Controller(s) Data Collection, Analytics, and Events Event Correlation Micro Services Bus / Data Movement External Controller meets all run-time APIs for the relevant functions needed by the Resource(s) it manages Configuration Templates Network / service Model Service Recipes DCAE collects telemetry data directly from VNF / PNFs External Controller can also choose to meet ONAP design-time APIs. Optional external controller artifact design 5
6 VNF / PNF Onboarding 6 DESIGN-TIME Resource Onboarding Service Design Policy Creation & Validation Analytic Application Design Closed Loop Design OSS / BSS Recipe/Eng Rules & Policy Distribution ONAP Target Architecture (High-Level Functional View) Dashboard OA&M Policy Framework Change Management Design Note that this presentation does not address the 3 Multi-Cloud rd Party Design Controller Test & that Certification appears the ONAP Target Architecture slide. Rather, this presentation Adaptation addresses External Controllers which are peers of SDNC and GNFC as shown on the next slide. Catalog Optional External Systems Network Function Layer CLI ONAP External APIs Data Collection, Analytics, and Events Event Correlation SDN Controller (L0-L3) Hypervisor / OS Layer OpenStack Private Edge Cloud 3rd Party Controller B MPLS Kubernetes Orchestration Micro Services Bus / Data Movement (see Note 1) Configuration & Life Cycle Management 3rd Party Controller A Private DC Cloud U-UI RUN-TIME Active & Available Inventory External Registry Generic NF Controllers (L4-L7) Configuration & Life Cycle Management Specific VNF Manager VNFs Akaraino IP VMware Public Cloud ONAP Portal Azure Common Services Application Authorization Framework Common ONAP Optimization Services Framework Logging Element Management System PNFs Others Managed Environment ONAP Operations Manager CCSDK
7 VNF / PNF Onboarding OSS / BSS DESIGN-TIME Resource Onboarding Service Design Policy Creation & Validation Analytic Application Design Closed Loop Design Change Management Design Design Test & Certification Catalog Recipe/Eng Rules & Policy Distribution 7 ONAP Target Architecture (High-Level Functional View) Dashboard OA&M Policy Framework Multi-Cloud Adaptation Optional External Systems Network Function Layer CLI ONAP External APIs Data Collection, Analytics, and Events Event Correlation SDN Controller (L0-L3) Hypervisor / OS Layer OpenStack Private Edge Cloud MPLS Kubernetes Orchestration Micro Services Bus / Data Movement (see Note 1) Configuration & Life Cycle Management Specific VNF Manager Private DC Cloud U-UI RUN-TIME VNFs Akaraino IP Active & Available Inventory External Registry Generic NF Controllers (L4-L7) External Controller Configuration & Life Cycle Management VMware Public Cloud ONAP Portal Element Management System Azure Common Services Application Authorization Framework Common ONAP Optimization Services Framework Logging Others PNFs Managed Environment ONAP Operations Manager CCSDK
8 Next Steps: Define What Is an ONAP Controller In order for the proposed approach to work, it is necessary to publish a well-defined specification of the functionality that an ONAP Controller supports and the APIs it exposes to meet that functionality. Among other things, this definition should include the following points What is the scope of an ONAP Controller: ONAP components interact with ONAP Controllers primarily at the Resource-level, within a Service context. ONAP Controllers expose Resource-level LCM APIs such as: configure NF, activate NF, restart NF, run NF health check, upgrade NF software, etc. For example, SO interactions with Controllers are fundamentally at the Resource level, where a Resource is either of Network Function (a VNF, PNF, or Allotted Resource ( my share of a NF) or a Network (e.g., my share of a WAN) E.g., for an ONAP Service X that is comprised of 3 dedicated VNF types: A,B, and C, a different GNFC type/instance could be used to configure each VNF type. The VNF A GNFC is able to configure that VNF in the context of the Service X. Hence, ONAP Controllers are more properly thought of as being Resource-level Controllers. The locus of Service-level Control in ONAP is understood not to be a Controller but rather the collective of interacting components within ONAP itself. How does an SDNC differ from a GNFC: The ONAP Target Architecture diagram represents ONAP Controllers as being of two basic types We use the term SDNC for a ONAP Controller instance that manages Network Function Resources that provide L0-3 functionality and/or manages (non-network Function) Resources that are Networks. We use the term GNFC for an ONAP Controller instance that manages Network Function Resources that provide L4+ functionality. Because both SDNC and Gen NFC perform common LCM functions for Network Function Resources, they should both be implemented from a common CCSDK (separate presentation). 8
9 What is an ONAP Controller? (Continued) The special case of assign (?): It is only an SDNC that performs the assign functionality for all Network Functions (L0+) and Network o The assign function is called by Orchestration to ensure that ONAP knows the instance values for all of the deployment data attributes for that Resource. E.g., it is as a result of the assign interaction that SDNC assigns instance values for the IP Addresses that correspond to the external connection points of a given Network Function (e.g., VNF) or Network (e.g., WAN VLAN). o By deployment data we mean that set of data that must be configured at instantiation time in order for the Resource to be further managed (configured) by ONAP. o Note that ONAP hasn t typically employed the term deployment data but rather this term is being adopted for this presentation from the ETSI common usage and is meant to convey the same meaning as ETSI assumes. It is believed that in some cases this assign function could require service-level context that spans across multiple Resource instances within a given Service Instance. o For this reason, ONAP currently also supports a service-level assign interaction with SDNC. This was created due to the potential existence of service-level assignments. However, today not much is done with this call. o It is also for this reason that the same SDNC instance performs the assign function for all Resource instances for a given Service instance. It is believed that this scope into the service-level space is unique to the assign function, and not shared for other LCM operations. E.g., for a given Service instance, a different Controller instance could be used to configure and activate each VNF instance that comprise that Service instance 9
10 s Backup Slides
11 ONAP Processing for Example Service X (Target Architecture Assumed) Svc X VNFA VNFB 1 Instantiate Svc X 9 Post Instantiate (Configure) Svc X 2 Decompose, Home Svc X, spawn Resource-level (VNF a, b) sub-flows SO 3 Assign Svc X (L0-7) Assign VNF a 4 (L0-7) [repeat for VNF b] 6 Configure (Initial) VNF a 8 [repeat for VNF b] Activate VNF a [Repeat for VNF b] 10 Post Instantiate (Configure) VNF a [Repeat for VNF b] SDNC Controller (SDNC or GNFC) 5 Create VNF a [repeat for VNF b] 7 Configure VNF a (netconf) [repeatforvnfb] 11 Configure VNF a (netconf) [Repeat forvnfb] MultiVIM VNF a 11
12 SDNC Assign Function for Example Service Y Svc Y VNF 1 VNF 2 Network a 3 rd Party Controller WAN modeled as an SDC Resource VLAN =123 VLAN =123 VLAN =123 VLAN =123 VNF 1 GW PE AT&T PE GW VNF 2 Resource 1 VNF AWS assign Resource 1 results in assigning the VLAN endpoint of VNF 1 AT&T assign Resource a results in assigning the VLAN endpoints or the WAN network a Resource a Network AWS assign Resource 1 results in assigning the VLAN endpoint of VNF 2 Resource 2 VNF
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