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diff --git a/docs/Chapter7.rst b/docs/Chapter7.rst deleted file mode 100644 index 9eb9d35..0000000 --- a/docs/Chapter7.rst +++ /dev/null @@ -1,1883 +0,0 @@ -.. This work is licensed under a Creative Commons Attribution 4.0 International License. -.. http://creativecommons.org/licenses/by/4.0 -.. Copyright 2017 AT&T Intellectual Property. All rights reserved. - - -ONAP Management Requirements -============================ - -The ONAP platform is the part of the larger Network Function -Virtualization/Software Defined Network (NFV/SDN) ecosystem that -is responsible for the efficient control, operation and management -of Virtual Network Function (VNF) capabilities and functions. It -specifies standardized abstractions and interfaces that enable -efficient interoperation of the NVF/SDN ecosystem components. It -enables product/service independent capabilities for design, creation -and runtime lifecycle management (includes all aspects of installation, -change management, assurance, and retirement) of resources in NFV/SDN -environment (see ECOMP white paper ). These capabilities are provided -using two major architectural frameworks: (1) a Design Time Framework -to design, define and program the platform (uniform onboarding), and -(2) a Runtime Execution Framework to execute the logic programmed in -the design environment (uniform delivery and runtime lifecycle -management). The platform delivers an integrated information model -based on the VNF package to express the characteristics and behavior -of these resources in the Design Time Framework. The information model -is utilized by Runtime Execution Framework to manage the runtime -lifecycle of the VNFs. The management processes are orchestrated -across various modules of ONAP to instantiate, configure, scale, -monitor, and reconfigure the VNFs using a set of standard APIs -provided by the VNF developers. - -Although the guidelines and requirements specified in this document -were originally driven by the need to standardize and automate the -management of the virtualized environments (with VNFs) operated by -Service Providers, we believe that most of the requirements are equally -applicable to the operation of the physical network functions (PNFs), -those network functions provided by traditional physical network -elements (e.g. whitebox switches) or customized peripherals (e.g. a -video rendering engine for augmented reality). The primary area of -difference will be in how the network function is orchestrated into -place – VNFs can be much more dynamically created & placed by ONAP -to support varying geographic, availability and scalability needs, -whereas the PNFs have to be deployed a priori in specific locations -based on planning and engineering – their availability and scalability -will be determined by the capabilities offered by the PNFs. - -**PNF** is a vendor-provided Network Function(s) implemented using a -bundled set of hardware and software while VNFs utilize cloud resources -to provide Network Functions through virtualized software modules. PNF -can be supplied by a vendor as a Black BOX (provides no knowledge of its -internal characteristics, logic, and software design/architecture) or as -a White Box (provides detailed knowledge and access of its internal -components and logic) or as a Grey Box (provides limited knowledge and -access to its internal components). - -* Requirements that equally apply to both VNFs and PNFs are defined as - "The xNF MUST/SHOULD/..." -* Requirements that only apply to VNFs are defined as "The VNF MUST/SHOULD/..." -* Requirements that only apply to PNFs are defined as "The PNF MUST/SHOULD/..." - - -Service Design ------------------------------------- - -This section, Service Design, has been left intentionally blank. It -is out-of-scope for the VNF Requirements project for the Amsterdam -release and no numbered requirements are expected. Content may be -added in future updates of this document. - -VNF On-boarding and package management ------------------------------------------------------------------------------ - -Design Definition -^^^^^^^^^^^^^^^^^^ - -The ONAP Design Time Framework provides the ability to design NFV -resources including VNFs, Services, and products. The VNF provider must -provide VNF packages that include a rich set of recipes, management and -functional interfaces, policies, configuration parameters, and -infrastructure requirements that can be utilized by the ONAP Design -module to onboard and catalog these resources. Initially this -information may be provided in documents, but in the near future a -method will be developed to automate as much of the transfer of data as -possible to satisfy its long term requirements. - -The current VNF Package Requirement is based on a subset of the -Requirements contained in the ETSI Document: ETSI GS NFV-MAN 001 v1.1.1 -and GS NFV IFA011 V0.3.0 (2015-10) - Network Functions Virtualization -(NFV), Management and Orchestration, VNF Packaging Specification. - -Resource Description -^^^^^^^^^^^^^^^^^^^^^^ - -* R-77707 The xNF provider **MUST** include a Manifest File that - contains a list of all the components in the xNF package. -* R-66070 The xNF Package **MUST** include xNF Identification Data to - uniquely identify the resource for a given xNF provider. The identification - data must include: an identifier for the xNF, the name of the xNF as was - given by the xNF provider, xNF description, xNF provider, and version. -* R-69565 The xNF Package **MUST** include documentation describing xNF - Management APIs, which must include information and tools for ONAP to - deploy and configure (initially and ongoing) the xNF application(s) - (e.g., NETCONF APIs) which includes a description of configurable - parameters for the xNF and whether the parameters can be configured - after xNF instantiation. -* R-00156 The xNF Package **MUST** include documentation describing xNF - Management APIs, which must include information and tools for ONAP - to monitor the health of the xNF (conditions that require healing - and/or scaling responses). -* R-00068 The xNF Package **MUST** include documentation which includes - a description of parameters that can be monitored for the xNF and - event records (status, fault, flow, session, call, control plane, - etc.) generated by the xNF after instantiation. -* R-12678 The xNF Package **MUST** include documentation which includes a - description of runtime lifecycle events and related actions (e.g., - control responses, tests) which can be performed for the xNF. -* R-84366 The xNF Package **MUST** include documentation describing - xNF Functional APIs that are utilized to build network and - application services. This document describes the externally exposed - functional inputs and outputs for the xNF, including interface - format and protocols supported. -* R-36280 The xNF provider **MUST** provide documentation describing - xNF Functional Capabilities that are utilized to operationalize the - xNF and compose complex services. -* R-98617 The xNF provider **MUST** provide information regarding any - dependency (e.g., affinity, anti-affinity) with other xNFs and resources. - -Resource Configuration -^^^^^^^^^^^^^^^^^^^^^^^ - -* R-89571 The xNF **MUST** support and provide artifacts for configuration - management using at least one of the following technologies; - a) Netconf/YANG, b) Chef, or c) Ansible. - - Note: The requirements for Netconf/YANG, Chef, and Ansible protocols - are provided separately and must be supported only if the corresponding - protocol option is provided by the xNF providor. - -Configuration Management via NETCONF/YANG -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - -* R-30278 The xNF provider **MUST** provide a Resource/Device YANG model - as a foundation for creating the YANG model for configuration. This will - include xNF attributes/parameters and valid values/attributes configurable - by policy. - -Configuration Management via Chef -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - -* R-13390 The xNF provider **MUST** provide cookbooks to be loaded - on the appropriate Chef Server. -* R-18525 The xNF provider **MUST** provide a JSON file for each - supported action for the xNF. The JSON file must contain key value - pairs with all relevant values populated with sample data that illustrates - its usage. The fields and their description are defined in Tables A1 - and A2 in the Appendix. - - Note: Chef support in ONAP is not currently available and planned for 4Q 2017. - -Configuration Management via Ansible -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - -* R-75608 The xNF provider **MUST** provide playbooks to be loaded - on the appropriate Ansible Server. -* R-16777 The xNF provider **MUST** provide a JSON file for each - supported action for the xNF. The JSON file must contain key value - pairs with all relevant values populated with sample data that illustrates - its usage. The fields and their description are defined in Table B1 - in the Appendix. - -* R-46567 The xNF Package **MUST** include configuration scripts - for boot sequence and configuration. -* R-16065 The xNF provider **MUST** provide configurable parameters - (if unable to conform to YANG model) including xNF attributes/parameters - and valid values, dynamic attributes and cross parameter dependencies - (e.g., customer provisioning data). - -Resource Control Loop -^^^^^^^^^^^^^^^^^^^^^^^ - -* R-22888 The xNF provider **MUST** provide documentation for the xNF - Policy Description to manage the xNF runtime lifecycle. The document - must include a description of how the policies (conditions and actions) - are implemented in the xNF. -* R-01556 The xNF Package **MUST** include documentation describing the - fault, performance, capacity events/alarms and other event records - that are made available by the xNF. -* R-16875 The xNF Package **MUST** include documentation which must include - a unique identification string for the specific xNF, a description of - the problem that caused the error, and steps or procedures to perform - Root Cause Analysis and resolve the issue. -* R-35960 The xNF Package **MUST** include documentation which must include - all events, severity level (e.g., informational, warning, error) and - descriptions including causes/fixes if applicable for the event. -* R-42018 The xNF Package **MUST** include documentation which must include - all events (fault, measurement for xNF Scaling, Syslogs, State Change - and Mobile Flow), that need to be collected at each VM, VNFC (defined in `VNF Guidelines <http://onap.readthedocs.io/en/latest/submodules/vnfrqts/guidelines.git/docs/vnf_guidelines/vnf_guidelines.html#a-glossary>`__ ) and for the overall xNF. -* R-27711 The xNF provider **MUST** provide an XML file that contains a - list of xNF error codes, descriptions of the error, and possible - causes/corrective action. -* R-01478 The xNF Package **MUST** include documentation describing all - parameters that are available to monitor the xNF after instantiation - (includes all counters, OIDs, PM data, KPIs, etc.) that must be - collected for reporting purposes. -* R-73560 The xNF Package **MUST** include documentation about monitoring - parameters/counters exposed for virtual resource management and xNF - application management. -* R-90632 The xNF Package **MUST** include documentation about KPIs and - metrics that need to be collected at each VM for capacity planning - and performance management purposes. -* R-86235 The xNF Package **MUST** include documentation about the monitoring - parameters that must include latencies, success rates, retry rates, load - and quality (e.g., DPM) for the key transactions/functions supported by - the xNF and those that must be exercised by the xNF in order to perform - its function. -* R-33904 The xNF Package **MUST** include documentation for each KPI, provide - lower and upper limits. -* R-53598 The xNF Package **MUST** include documentation to, when relevant, - provide a threshold crossing alert point for each KPI and describe the - significance of the threshold crossing. -* R-69877 The xNF Package **MUST** include documentation for each KPI, - identify the suggested actions that need to be performed when a - threshold crossing alert event is recorded. -* R-22680 The xNF Package **MUST** include documentation that describes - any requirements for the monitoring component of tools for Network - Cloud automation and management to provide these records to components - of the xNF. -* R-33694 The xNF Package **MUST** include documentation to when applicable, - provide calculators needed to convert raw data into appropriate reporting - artifacts. -* R-56815 The xNF Package **MUST** include documentation describing - supported xNF scaling capabilities and capacity limits (e.g., number - of users, bandwidth, throughput, concurrent calls). -* R-48596 The xNF Package **MUST** include documentation describing - the characteristics for the xNF reliability and high availability. -* R-74763 The xNF provider **MUST** provide an artifact per xNF that contains - all of the xNF Event Records supported. The artifact should include - reference to the specific release of the xNF Event Stream Common Event - Data Model document it is based on. (e.g., - `VES Event Listener <https://github.com/att/evel-test-collector/tree/master/docs/att_interface_definition>`__) - -Compute, Network, and Storage Requirements -^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ - -* R-35851 The xNF Package **MUST** include xNF topology that describes - basic network and application connectivity internal and external to the - xNF including Link type, KPIs, Bandwidth, latency, jitter, QoS (if - applicable) for each interface. -* R-97102 The VNF Package **MUST** include VM requirements via a Heat - template that provides the necessary data for VM specifications - for all VNF components - for hypervisor, CPU, memory, storage. -* R-20204 The VNF Package **MUST** include VM requirements via a Heat - template that provides the necessary data for network connections, - interface connections, internal and external to VNF. -* R-44896 The VNF Package **MUST** include VM requirements via a Heat - template that provides the necessary data for high availability - redundancy model. -* R-55802 The VNF Package **MUST** include VM requirements via a Heat - template that provides the necessary data for scaling/growth VM - specifications. - - Note: Must comply with the *Heat requirements in 5.b*. - -* R-26881 The xNF provider **MUST** provide the binaries and images - needed to instantiate the xNF (xNF and VNFC images). -* R-96634 The xNF provider **MUST** describe scaling capabilities - to manage scaling characteristics of the xNF. - - -Testing -^^^^^^^^^^ - -* R-43958 The xNF Package **MUST** include documentation describing - the tests that were conducted by the xNF providor and the test results. -* R-04298 The xNF provider **MUST** provide their testing scripts to - support testing. -* R-58775 The xNF provider **MUST** provide software components that - can be packaged with/near the xNF, if needed, to simulate any functions - or systems that connect to the xNF system under test. This component is - necessary only if the existing testing environment does not have the - necessary simulators. - -Licensing Requirements -^^^^^^^^^^^^^^^^^^^^^^^ - -* R-85653 The xNF **MUST** provide metrics (e.g., number of sessions, - number of subscribers, number of seats, etc.) to ONAP for tracking - every license. -* R-44125 The xNF provider **MUST** agree to the process that can - be met by Service Provider reporting infrastructure. The Contract - shall define the reporting process and the available reporting tools. -* R-40827 The xNF provider **MUST** enumerate all of the open - source licenses their xNF(s) incorporate. -* R-97293 The xNF provider **MUST NOT** require audits of - Service Provider’s business. -* R-44569 The xNF provider **MUST NOT** require additional - infrastructure such as a xNF provider license server for xNF provider - functions and metrics. -* R-13613 The VNF **MUST** provide clear measurements for licensing - purposes to allow automated scale up/down by the management system. -* R-27511 The VNF provider **MUST** provide the ability to scale - up a VNF provider supplied product during growth and scale down a - VNF provider supplied product during decline without “real-time” - restrictions based upon VNF provider permissions. -* R-85991 The xNF provider **MUST** provide a universal license key - per xNF to be used as needed by services (i.e., not tied to a VM - instance) as the recommended solution. The xNF provider may provide - pools of Unique xNF License Keys, where there is a unique key for - each xNF instance as an alternate solution. Licensing issues should - be resolved without interrupting in-service xNFs. -* R-47849 The xNF provider **MUST** support the metadata about - licenses (and their applicable entitlements) as defined in this - document for xNF software, and any license keys required to authorize - use of the xNF software. This metadata will be used to facilitate - onboarding the xNF into the ONAP environment and automating processes - for putting the licenses into use and managing the full lifecycle of - the licenses. The details of this license model are described in - Tables C1 to C8 in the Appendix. Note: License metadata support in - ONAP is not currently available and planned for 1Q 2018. - -Configuration Management ---------------------------------------------------- - -Controller Interactions With VNF -^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ - -ONAP Controllers (such as APPC) expose a northbound API to clients -(such as SO) in order for the clients to initiate an activity -(aka command) on a VNF. ONAP controllers interact with VNFs through -Network and Application Adapters to perform configuration and other -lifecycle management activities within NFV environment. -The standardized models, protocols and mechanisms by which network -functions are configured are equally applicable to VNFs and PNFs. - -This section describes the list of commands that should be supported -by the VNF. The following sections describe the standard protocols -that are supported (NETCONF, Chef, Ansible, and REST). - -The commands below are expected to be supported on all VNF’s, unless -noted otherwise, either directly (via the NETCONF or REST interface) -or indirectly (via a Chef Cookbook or Ansible server). Note that there -are additional commands offered to northbound clients that are not shown -below, as these commands either act internally on the Controller itself -or depend upon network cloud components for implementation (thus, these -actions do not put any special requirement on the VNF provider). - -The commands allow for parametric data to be passed from the controller -to the VNF or Ansible/Chef server in the request. The format of the -parameter data can be either xml (for NETCONF) or JSON (for Ansible, -Chef, or REST). - -Configuration Commands -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - -**Configure**: The Controller client is requesting that a post-instantiation -configuration be applied to the target VNF instance. After the Configure -action is completed, the VNF instance should be ready for service. -Note that customer specific configurations may need to be applied using -the ConfigModify action. - -**ConfigModify**: The Controller client is requesting a configuration -update to a subset of the total configuration parameters of a VNF or to -apply customer specific configurations. The configuration update is -typically done while the VNF is in service and should not disrupt traffic. - -**ConfigBackup**: The Controller client is requesting a backup of the -configuration parameters where the parameters are stored on the VNF. -This command is typically requested as part of an orchestration flow -for scenarios such as a software upgrade. The ConfigBackup is typically -done while the VNF is not in service (i.e., in a maintenance state). -When the ConfigBackup command is executed, the current VNF configuration -parameters are saved in storage that is preserved (if there is an existing -set of backed up parameters, they are overwritten). - -**ConfigRestore**: The Controller client is requesting a restore action of -the configuration parameters to the VNF that were saved by ConfigBackup -command. This command is typically requested as part of an orchestration -flow for scenarios such as a software upgrade where the software upgrade -may have failed and the VNF needs to be rolled back to the prior configuration. -When the ConfigRestore command is executed, the VNF configuration parameters -which were backed to persistent preserved storage are applied to the VNF -(replacing existing parameters). The ConfigRestore is typically done while -the VNF is not in service (i.e., in a maintenance state). - -**ConfigScaleOut**: The Controller client is requesting that a configuration -be applied after the VNF instance has been scaled out (i.e., one or more -additional VM’s instantiated to increase capacity). For some VNF’s, -ConfigScaleOut is not needed because the VNF is auto-configured after -scale-out. This command is being introduced in the Beijing release. - -**Audit**: The Controller client is requesting that the current (last known -configuration update) is audited against the running configuration on the VNF. - -* R-20741 The xNF **MUST** support ONAP Controller’s **Configure** command. -* R-19366 The xNF **MUST** support ONAP Controller’s **ConfigModify** command. -* R-32981 The xNF **MUST** support ONAP Controller’s **ConfigBackup** command. -* R-48247 The xNF **MUST** support ONAP Controller’s **ConfigRestore** command. -* R-94084 The xNF **MUST** support ONAP Controller’s **ConfigScaleOut** - command. -* R-56385 The xNF **MUST** support ONAP Controller’s **Audit** command. - -LifeCycle Management Related Commands -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - -**The following commands are needed to support various lifecycle management -flows where the VNF may need to be removed for service.** - -**QuiesceTraffic**: The Controller client is requesting the VNF gracefully -stop traffic (aka block and drain traffic). The method for quiescing traffic -is specific to the VNF architecture. The action is completed when all -(in-flight transactions) traffic has stopped. The VNF remains in an active -state where the VNF is able to process traffic (initiated using the -StartTraffic action). - -**ResumeTraffic**: The Controller client is requesting the VNF resume -processing traffic. The method to resume traffic is specific to the VNF -architecture. - -**StopApplication**: The Controller client is requesting that the application -running on the VNF is stopped gracefully (i.e., without traffic loss). -This is equivalent to quiescing the traffic and then stopping the application -processes. The processes can be restarted using the StartApplication command. - -**StartApplication**: The Controller client is requesting that the application -running on the VNF is started. Get ready to process traffic. - -**The following commands are needed to support software upgrades, in-place or -other type of software upgrade. The VNF instance may be removed from service -for the upgrade.** - -**UpgradePrecheck**: The Controller client is requesting a confirmation that -the VNF can (and needs to) be upgraded to a specific software version -(specified in the request). - -**UpgradeSoftware**: The Controller client is requesting that a (in-place) -software upgrade be performed on the VNF. The software to be applied is -pre-loaded to a specified location. - -**UpgradePostCheck**: The Controller client is requesting a confirmation that -the VNF software upgrade has been completed successfully (VNF upgraded to -the new software version). - -**UpgradeBackup**: The Controller client is requesting that the VNF is backed -up prior to the UpgradeSoftware. - -**UpgradeBackOut**: The Controller client is requesting that the VNF upgrade -is backed out (in the event that the SoftwareUpgrade or UpgradePostCheck -failed). - -* R-12706 The xNF **MUST** support ONAP Controller’s **QuiesceTraffic** - command. -* R-07251 The xNF **MUST** support ONAP Controller’s **ResumeTraffic** - command. -* R-83146 The xNF **MUST** support ONAP Controller’s **StopApplication** - command. -* R-82811 The xNF **MUST** support ONAP Controller’s **StartApplication** - command. -* R-19922 The xNF **MUST** support ONAP Controller’s **UpgradePrecheck** - command. -* R-49466 The xNF **MUST** support ONAP Controller’s **UpgradeSoftware** - command. -* R-45856 The xNF **MUST** support ONAP Controller’s **UpgradePostCheck** - command. -* R-97343 The xNF **MUST** support ONAP Controller’s **UpgradeBackup** - command. -* R-65641 The xNF **MUST** support ONAP Controller’s **UpgradeBackOut** - command. - -Virtual Function - Container Recovery Requirements -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - -As part of life cycle management, for Cloud environment, VNFs need to -support a set of basic recovery capabilities to maintain the health -and extend the life of the VNF, eliminating and reducing the frequency -that an entire VNF needs to be rebuilt or re-instantiated to recover one -or more of its containers. For instance, a VNF in an Openstack environment -is composed of one or more containers called VMs (Virtual Machines). During -the life of a VNF it is expected that Cloud infrastructure hardware will -fail or they would need to be taken down for maintenance or hardware and -software upgrades (e.g. firmware upgrades, HostOS (Hypervisor), power -maintenance, power outages, etc.) To deal with such life cycle events -without having to rebuild entire VNFs or even entire sites these basic -recovery capabilities of individual containers, Virtual Machines or other, -must be supported. - -* R-11790 The VNF **MUST** support ONAP Controller’s - **Restart (stop/start or reboot)** command. -* R-56218 The VNF **MUST** support ONAP Controller’s Migrate command that - moves container (VM) from a live Physical Server / Compute Node to - another live Physical Server / Compute Node. - -NOTE: Container migrations MUST be transparent to the VNF and no more -intrusive than a stop, followed by some down time for the migration to -be performed from one Compute Node / Physical Server to another, followed -by a start of the same VM with same configuration on the new Compute -Node / Physical Server. - -* R-38001 The VNF MUST support ONAP Controller’s **Rebuild** command. -* R-76901 VNF MUST support a container rebuild mechanism based on existing - image (e.g. Glance image in Openstack environment) or a snapshot. - -HealthCheck and Failure Related Commands -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - -**HealthCheck**: The Controller client is requesting a health check over the -entire scope of the VNF. The VNF must be 100% healthy, ready to take requests -and provide services, with all VNF required capabilities ready to provide -services and with all active and standby resources fully ready with no open -MINOR, MAJOR or CRITICAL alarms. - -Note: In addition to the commands above, the Controller supports a set of -Openstack failure recovery related commands that are executed on-demand or via -Control Loop at the VM level. The VNF must support these commands in a fully -automated fashion. - -* R-41430 The xNF **MUST** support ONAP Controller’s **HealthCheck** - command. - -Notes On Command Support Using Controller Southbound Protocols -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - -The ONAP Controllers are designed to support a standard set of protocols in -order to communicate with the VNF instance. The supported protocols are -NETCONF, Ansible, Chef, and REST. - -NETCONF and REST require the VNF to implement a server which supports the RPC -or REST calls. - -Ansible and Chef require the use of a Ansible or Chef server which communicates -with the Controller (northbound) and the VNF VM’s (southbound). - -The vendor must select which protocol to support for the commands listed above. -Notes: - -* NETCONF is most suitable for configuration related commands - -* Ansible and Chef are suitable for any command. - Ansible has the advantage that it is agentless. - -* REST is specified as an option only for the HealthCheck. - - -Additional details can be found in the `ONAP Application Controller (APPC) API Guide <http://onap.readthedocs.io/en/latest/submodules/appc.git/docs/APPC%20API%20Guide/APPC%20API%20Guide.html>`_, `ONAP VF-C project <http://onap.readthedocs.io/en/latest/submodules/vfc/nfvo/lcm.git/docs/index.html>`_ and the `ONAP SDNC project <http://onap.readthedocs.io/en/latest/submodules/sdnc/northbound.git/docs/index.html>`_. - -NETCONF Standards and Capabilities -^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ - -ONAP Controllers and their Adapters utilize device YANG model and -NETCONF APIs to make the required changes in the VNF state and -configuration. The VNF providers must provide the Device YANG model and -NETCONF server supporting NETCONF APIs to comply with target ONAP and -industry standards. - -VNF Configuration via NETCONF Requirements -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - -Configuration Management -+++++++++++++++++++++++++++ - -* R-88026 The xNF **MUST** include a NETCONF server enabling - runtime configuration and lifecycle management capabilities. -* R-95950 The xNF **MUST** provide a NETCONF interface fully defined - by supplied YANG models for the embedded NETCONF server. - -NETCONF Server Requirements -++++++++++++++++++++++++++++++ - -* R-73468 The xNF **MUST** allow the NETCONF server connection - parameters to be configurable during virtual machine instantiation - through Heat templates where SSH keys, usernames, passwords, SSH - service and SSH port numbers are Heat template parameters. -* R-90007 The xNF **MUST** implement the protocol operation: - **close-session()**- Gracefully close the current session. -* R-70496 The xNF **MUST** implement the protocol operation: - **commit(confirmed, confirm-timeout)** - Commit candidate - configuration datastore to the running configuration. -* R-18733 The xNF **MUST** implement the protocol operation: - **discard-changes()** - Revert the candidate configuration - datastore to the running configuration. -* R-44281 The xNF **MUST** implement the protocol operation: - **edit-config(target, default-operation, test-option, error-option, - config)** - Edit the target configuration datastore by merging, - replacing, creating, or deleting new config elements. -* R-60106 The xNF **MUST** implement the protocol operation: - **get(filter)** - Retrieve (a filtered subset of) the running - configuration and device state information. This should include - the list of xNF supported schemas. -* R-29488 The xNF **MUST** implement the protocol operation: - **get-config(source, filter)** - Retrieve a (filtered subset of - a) configuration from the configuration datastore source. -* R-11235 The xNF **MUST** implement the protocol operation: - **kill-session(session)** - Force the termination of **session**. -* R-02597 The xNF **MUST** implement the protocol operation: - **lock(target)** - Lock the configuration datastore target. -* R-96554 The xNF **MUST** implement the protocol operation: - **unlock(target)** - Unlock the configuration datastore target. -* R-29324 The xNF **SHOULD** implement the protocol operation: - **copy-config(target, source) -** Copy the content of the - configuration datastore source to the configuration datastore target. -* R-88031 The xNF **SHOULD** implement the protocol operation: - **delete-config(target) -** Delete the named configuration - datastore target. -* R-97529 The xNF **SHOULD** implement the protocol operation: - **get-schema(identifier, version, format) -** Retrieve the YANG schema. -* R-62468 The xNF **MUST** allow all configuration data to be - edited through a NETCONF <edit-config> operation. Proprietary - NETCONF RPCs that make configuration changes are not sufficient. -* R-01382 The xNF **MUST** allow the entire configuration of the - xNF to be retrieved via NETCONF's <get-config> and <edit-config>, - independently of whether it was configured via NETCONF or other - mechanisms. -* R-28756 The xNF **MUST** support **:partial-lock** and - **:partial-unlock** capabilities, defined in RFC 5717. This - allows multiple independent clients to each write to a different - part of the <running> configuration at the same time. -* R-83873 The xNF **MUST** support **:rollback-on-error** value for - the <error-option> parameter to the <edit-config> operation. If any - error occurs during the requested edit operation, then the target - database (usually the running configuration) will be left unaffected. - This provides an 'all-or-nothing' edit mode for a single <edit-config> - request. -* R-68990 The xNF **MUST** support the **:startup** capability. It - will allow the running configuration to be copied to this special - database. It can also be locked and unlocked. -* R-68200 The xNF **MUST** support the **:url** value to specify - protocol operation source and target parameters. The capability URI - for this feature will indicate which schemes (e.g., file, https, sftp) - that the server supports within a particular URL value. The 'file' - scheme allows for editable local configuration databases. The other - schemes allow for remote storage of configuration databases. -* R-20353 The xNF **MUST** implement both **:candidate** and - **:writable-running** capabilities. When both **:candidate** and - **:writable-running** are provided then two locks should be supported. -* R-11499 The xNF **MUST** fully support the XPath 1.0 specification - for filtered retrieval of configuration and other database contents. - The 'type' attribute within the <filter> parameter for <get> and - <get-config> operations may be set to 'xpath'. The 'select' attribute - (which contains the XPath expression) will also be supported by the - server. A server may support partial XPath retrieval filtering, but - it cannot advertise the **:xpath** capability unless the entire XPath - 1.0 specification is supported. -* R-83790 The xNF **MUST** implement the **:validate** capability -* R-49145 The xNF **MUST** implement **:confirmed-commit** If - **:candidate** is supported. -* R-58358 The xNF **MUST** implement the **:with-defaults** capability - [RFC6243]. -* R-59610 The xNF **MUST** implement the data model discovery and - download as defined in [RFC6022]. -* R-93443 The xNF **MUST** define all data models in YANG [RFC6020], - and the mapping to NETCONF shall follow the rules defined in this RFC. -* R-26115 The xNF **MUST** follow the data model upgrade rules defined - in [RFC6020] section 10. All deviations from section 10 rules shall - be handled by a built-in automatic upgrade mechanism. -* R-10716 The xNF **MUST** support parallel and simultaneous - configuration of separate objects within itself. -* R-29495 The xNF **MUST** support locking if a common object is - being manipulated by two simultaneous NETCONF configuration operations - on the same xNF within the context of the same writable running data - store (e.g., if an interface parameter is being configured then it - should be locked out for configuration by a simultaneous configuration - operation on that same interface parameter). -* R-53015 The xNF **MUST** apply locking based on the sequence of - NETCONF operations, with the first configuration operation locking - out all others until completed. -* R-02616 The xNF **MUST** permit locking at the finest granularity - if a xNF needs to lock an object for configuration to avoid blocking - simultaneous configuration operations on unrelated objects (e.g., BGP - configuration should not be locked out if an interface is being - configured or entire Interface configuration should not be locked out - if a non-overlapping parameter on the interface is being configured). -* R-41829 The xNF **MUST** be able to specify the granularity of the - lock via a restricted or full XPath expression. -* R-66793 The xNF **MUST** guarantee the xNF configuration integrity - for all simultaneous configuration operations (e.g., if a change is - attempted to the BUM filter rate from multiple interfaces on the same - EVC, then they need to be sequenced in the xNF without locking either - configuration method out). -* R-54190 The xNF **MUST** release locks to prevent permanent lock-outs - when/if a session applying the lock is terminated (e.g., SSH session - is terminated). -* R-03465 The xNF **MUST** release locks to prevent permanent lock-outs - when the corresponding <partial-unlock> operation succeeds. -* R-63935 The xNF **MUST** release locks to prevent permanent lock-outs - when a user configured timer has expired forcing the NETCONF SSH Session - termination (i.e., product must expose a configuration knob for a user - setting of a lock expiration timer) -* R-10173 The xNF **MUST** allow another NETCONF session to be able to - initiate the release of the lock by killing the session owning the lock, - using the <kill-session> operation to guard against hung NETCONF sessions. -* R-88899 The xNF **MUST** support simultaneous <commit> operations - within the context of this locking requirements framework. -* R-07545 The xNF **MUST** support all operations, administration and - management (OAM) functions available from the supplier for xNFs using - the supplied YANG code and associated NETCONF servers. -* R-60656 The xNF **MUST** support sub tree filtering. -* R-80898 The xNF **MUST** support heartbeat via a <get> with null filter. -* R-25238 The xNF PACKAGE **MUST** validated YANG code using the open - source pyang [1]_ program using the following commands: - -.. code-block:: python - - $ pyang --verbose --strict <YANG-file-name(s)> - $ echo $! - -* R-63953 The xNF **MUST** have the echo command return a zero value - otherwise the validation has failed -* R-26508 The xNF **MUST** support a NETCONF server that can be mounted on - OpenDaylight (client) and perform the operations of: modify, update, - change, rollback configurations using each configuration data element, - query each state (non-configuration) data element, execute each YANG - RPC, and receive data through each notification statement. - - -The following requirements provides the Yang models that suppliers must -conform, and those where applicable, that suppliers need to use. - -* R-28545 The xNF **MUST** conform its YANG model to RFC 6060, - “YANG - A Data Modeling Language for the Network Configuration - Protocol (NETCONF)” -* R-22700 The xNF **MUST** conform its YANG model to RFC 6470, - “NETCONF Base Notifications”. -* R-10353 The xNF **MUST** conform its YANG model to RFC 6244, - “An Architecture for Network Management Using NETCONF and YANG”. -* R-53317 The xNF **MUST** conform its YANG model to RFC 6087, - “Guidelines for Authors and Reviewers of YANG Data Model Documents”. -* R-33955 The xNF **SHOULD** conform its YANG model to RFC 6991, - “Common YANG Data Types”. -* R-22946 The xNF **SHOULD** conform its YANG model to RFC 6536, - “NETCONF Access Control Model”. -* R-10129 The xNF **SHOULD** conform its YANG model to RFC 7223, - “A YANG Data Model for Interface Management”. -* R-12271 The xNF **SHOULD** conform its YANG model to RFC 7223, - “IANA Interface Type YANG Module”. -* R-49036 The xNF **SHOULD** conform its YANG model to RFC 7277, - “A YANG Data Model for IP Management”. -* R-87564 The xNF **SHOULD** conform its YANG model to RFC 7317, - “A YANG Data Model for System Management”. -* R-24269 The xNF **SHOULD** conform its YANG model to RFC 7407, - “A YANG Data Model for SNMP Configuration”, if Netconf used to - configure SNMP engine. - -The NETCONF server interface shall fully conform to the following -NETCONF RFCs. - -* R-33946 The xNF **MUST** conform to the NETCONF RFC 4741, - “NETCONF Configuration Protocol”. -* R-04158 The xNF **MUST** conform to the NETCONF RFC 4742, - “Using the NETCONF Configuration Protocol over Secure Shell (SSH)”. -* R-13800 The xNF **MUST** conform to the NETCONF RFC 5277, - “NETCONF Event Notification”. -* R-01334 The xNF **MUST** conform to the NETCONF RFC 5717, - “Partial Lock Remote Procedure Call”. -* R-08134 The xNF **MUST** conform to the NETCONF RFC 6241, - “NETCONF Configuration Protocol”. -* R-78282 The xNF **MUST** conform to the NETCONF RFC 6242, - “Using the Network Configuration Protocol over Secure Shell”. - -VNF REST APIs -^^^^^^^^^^^^^^^ - -HealthCheck is a command for which no NETCONF support exists. -Therefore, this must be supported using a RESTful interface -(defined in this section) or with a Chef cookbook/Ansible playbook -(defined in sections `Chef Standards and Capabilities`_ and -`Ansible Standards and Capabilities`_). - -HealthCheck Definition: The VNF level HealthCheck is a check over -the entire scope of the VNF. The VNF must be 100% healthy, ready -to take requests and provide services, with all VNF required -capabilities ready to provide services and with all active and -standby resources fully ready with no open MINOR, MAJOR or CRITICAL -alarms. NOTE: A switch may need to be turned on, but the VNF should -be ready to take service requests or be already processing service -requests successfully. - -The VNF must provide a REST formatted GET RPCs to support HealthCheck -queries via the GET method over HTTP(s). - -The port number, url, and other authentication information is provided -by the VNF provider. - -REST APIs -~~~~~~~~~ - -* R-31809 The xNF **MUST** support the HealthCheck RPC. The HealthCheck - RPC executes a xNF Provider-defined xNF HealthCheck over the scope of - the entire xNF (e.g., if there are multiple VNFCs, then run a health check, - as appropriate, for all VNFCs). It returns a 200 OK if the test completes. - A JSON object is returned indicating state (healthy, unhealthy), scope - identifier, time-stamp and one or more blocks containing info and fault - information. If the xNF is unable to run the HealthCheck, return a - standard http error code and message. - -Examples of responses when HealthCheck runs and is able to provide a healthy -or unhealthy response: - -.. code-block:: java - - { - "identifier": "scope represented", - "state": "healthy", - "time": "01-01-1000:0000" - } - - { - "identifier": "scope represented", - "state": "unhealthy", - {[ - "info": "System threshold exceeded details", - "fault": - { - "cpuOverall": 0.80, - "cpuThreshold": 0.45 - } - ]}, - "time": "01-01-1000:0000" - } - - -Chef Standards and Capabilities -^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ - -ONAP will support configuration of VNFs via Chef subject to the -requirements and guidelines defined in this section. - -The Chef configuration management mechanism follows a client-server -model. It requires the presence of a Chef-Client on the VNF that will be -directly managed by a Chef Server. The Chef-client will register with -the appropriate Chef Server and are managed via ‘cookbooks’ and -configuration attributes loaded on the Chef Server which contain all -necessary information to execute the appropriate actions on the VNF via -the Chef-client. - -ONAP will utilize the open source Chef Server, invoke the documented -Chef REST APIs to manage the VNF and requires the use of open source -Chef-Client and Push Jobs Client on the VNF -(https://downloads.chef.io/). - -VNF Configuration via Chef Requirements -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - -Chef Client Requirements -+++++++++++++++++++++++++ - -* R-79224 The xNF **MUST** have the chef-client be preloaded with - validator keys and configuration to register with the designated - Chef Server as part of the installation process. -* R-72184 The xNF **MUST** have routable FQDNs for all the endpoints - (VMs) of a xNF that contain chef-clients which are used to register - with the Chef Server. As part of invoking xNF actions, ONAP will - trigger push jobs against FQDNs of endpoints for a xNF, if required. -* R-47068 The xNF **MAY** expose a single endpoint that is - responsible for all functionality. -* R-67114 The xNF **MUST** be installed with Chef-Client >= 12.0 and - Chef push jobs client >= 2.0. - -Chef Roles/Requirements -++++++++++++++++++++++++++ - -* R-27310 The xNF Package **MUST** include all relevant Chef artifacts - (roles/cookbooks/recipes) required to execute xNF actions requested by - ONAP for loading on appropriate Chef Server. -* R-26567 The xNF Package **MUST** include a run list of - roles/cookbooks/recipes, for each supported xNF action, that will - perform the desired xNF action in its entirety as specified by ONAP - (see Section 7.c, ONAP Controller APIs and Behavior, for list of xNF - actions and requirements), when triggered by a chef-client run list - in JSON file. -* R-98911 The xNF **MUST NOT** use any instance specific parameters - for the xNF in roles/cookbooks/recipes invoked for a xNF action. -* R-37929 The xNF **MUST** accept all necessary instance specific - data from the environment or node object attributes for the xNF - in roles/cookbooks/recipes invoked for a xNF action. -* R-62170 The xNF **MUST** over-ride any default values for - configurable parameters that can be set by ONAP in the roles, - cookbooks and recipes. -* R-78116 The xNF **MUST** update status on the Chef Server - appropriately (e.g., via a fail or raise an exception) if the - chef-client run encounters any critical errors/failures when - executing a xNF action. -* R-44013 The xNF **MUST** populate an attribute, defined as node - [‘PushJobOutput’] with the desired output on all nodes in the push job - that execute chef-client run if the xNF action requires the output of a - chef-client run be made available (e.g., get running configuration). -* R-30654 The xNF Package **MUST** have appropriate cookbooks that are - designed to automatically ‘rollback’ to the original state in case of - any errors for actions that change state of the xNF (e.g., configure). -* R-65755 The xNF **SHOULD** support callback URLs to return information - to ONAP upon completion of the chef-client run for any chef-client run - associated with a xNF action. - -- As part of the push job, ONAP will provide two parameters in the - environment of the push job JSON object: - - - ‘RequestId’ a unique Id to be used to identify the request, - - ‘CallbackUrl’, the URL to post response back. - -- If the CallbackUrl field is empty or missing in the push job, then - the chef-client run need not post the results back via callback. - -* R-15885 The xNF **MUST** Upon completion of the chef-client run, - POST back on the callback URL, a JSON object as described in Table - A2 if the chef-client run list includes a cookbook/recipe that is - callback capable. Failure to POST on the Callback Url should not be - considered a critical error. That is, if the chef-client successfully - completes the xNF action, it should reflect this status on the Chef - Server regardless of whether the Callback succeeded or not. - -ONAP Chef API Usage -~~~~~~~~~~~~~~~~~~~ - -This section outlines the workflow that ONAP invokes when it receives an -action request against a Chef managed VNF. - -1. When ONAP receives a request for an action for a Chef Managed VNF, it - retrieves the corresponding template (based on **action** and - **VNF)** from its database and sets necessary values in the - “Environment”, “Node” and “NodeList” keys (if present) from either - the payload of the received action or internal data. - -2. If “Environment” key is present in the updated template, it posts the - corresponding JSON dictionary to the appropriate Environment object - REST endpoint on the Chef Server thus updating the Environment - attributes on the Chef Server. - -3. Next, it creates a Node Object from the “Node” JSON dictionary for - all elements listed in the NodeList (using the FQDN to construct the - endpoint) by replicating it [2]_. As part of this process, it will - set the name field in each Node Object to the corresponding FQDN. - These node objects are then posted on the Chef Server to - corresponding Node Object REST endpoints to update the corresponding - node attributes. - -4. If PushJobFlag is set to “True” in the template, ONAP requests a push - job against all the nodes in the NodeList to trigger - chef-client\ **.** It will not invoke any other command via the push - job. ONAP will include a callback URL in the push job request and a - unique Request Id. An example push job posted by ONAP is listed - below: - -.. code-block:: java - - { - "command": "chef-client", - "run\_timeout": 300, - "nodes”: [“node1.vnf\_a.onap.com”, “node2.vnf\_a.onap.com”], - "env": { - “RequestId”:”8279-abcd-aksdj-19231”, - “CallbackUrl”:”<callback>” - }, - } - -5. If CallbackCapable field in the template is not present or set to - “False” ONAP will poll the Chef Server to check completion status of - the push job. - -6. If “GetOutputFlag” is set to “True” in the template and - CallbackCapable is not set to “True”, ONAP will retrieve any output - from each node where the push job has finished by accessing the Node - Object attribute node[‘PushJobOutput’]. - -Ansible Standards and Capabilities -^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ - -ONAP will support configuration of VNFs via Ansible subject to the -requirements and guidelines defined in this section. - -Ansible allows agentless management of VNFs/VMs/VNFCs via execution -of ‘playbooks’ over ssh. The ‘playbooks’ are a structured set of -tasks which contain all the necessary resources and execution capabilities -to take the necessary action on one or more target VMs (and/or VNFCs) -of the VNF. ONAP will utilize the framework of an Ansible Server that -will host all Ansible artifacts and run playbooks to manage VNFs that support -Ansible. - -VNF Configuration via Ansible Requirements -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - -Ansible Client Requirements -+++++++++++++++++++++++++++++ - -* R-32217 The xNF **MUST** have routable FQDNs that are reachable via - the Ansible Server for the endpoints (VMs) of a xNF on which playbooks - will be executed. ONAP will initiate requests to the Ansible Server - for invocation of playbooks against these end points [3]_. -* R-54373 The xNF **MUST** have Python >= 2.6 on the endpoint VM(s) - of a xNF on which an Ansible playbook will be executed. -* R-35401 The xNF **MUST** support SSH and allow SSH access by the - Ansible server for the endpoint VM(s) and comply with the Network - Cloud Service Provider guidelines for authentication and access. -* R-82018 The xNF **MUST** load the Ansible Server SSH public key onto xNF - VM(s) as part - of instantiation. This will allow the Ansible Server to authenticate - to perform post-instantiation configuration without manual intervention - and without requiring specific xNF login IDs and passwords. - - CAUTION: For VNFs configured using Ansible, to eliminate the need - for manual steps, post-instantiation and pre-configuration, to upload - of SSH public keys, SSH public keys loaded during (heat) instantiation shall - be preserved and not removed by (heat) embedded (userdata) scripts. - -* R-92866 The xNF **MUST** include as part of post-instantiation configuration - done by Ansible Playbooks the removal/update of the SSH public key from - /root/.ssh/authorized_keys, and update of SSH keys loaded through - instantiation to support Ansible. This may include download and install of - new SSH keys and new mechanized IDs. -* R-91745 The xNF **MUST** update the Ansible Server and other entities - storing and using the SSH keys for authentication when the SSH keys used - by Ansible are regenerated/updated. - - NOTE: Ansible Server itself may be used to upload new SSH public keys - onto supported VNFs. - -Ansible Playbook Requirements -+++++++++++++++++++++++++++++++ - -An Ansible playbook is a collection of tasks that is executed on the -Ansible server (local host) and/or the target VM (s) in order to -complete the desired action. - -* R-40293 The xNF **MUST** make available playbooks that conform - to the ONAP requirement. -* R-49396 The xNF **MUST** support each ONAP (APPC) xNF action - by invocation of **one** playbook [4]_. The playbook will be responsible - for executing - all necessary tasks (as well as calling other playbooks) to complete - the request. -* R-33280 The xNF **MUST NOT** use any instance specific parameters - in a playbook. -* R-48698 The xNF **MUST** utilize information from key value pairs - that will be provided by the Ansible Server as "extra-vars" during - invocation to execute the desired xNF action. If the playbook requires - files, they must also be supplied using the methodology detailed in - the Ansible Server API, unless they are bundled with playbooks, example, - generic templates. - -The Ansible Server will determine if a playbook invoked to execute a -xNF action finished successfully or not using the “PLAY_RECAP” summary -in Ansible log. The playbook will be considered to successfully finish -only if the “PLAY RECAP” section at the end of playbook execution output -has no unreachable hosts and no failed tasks. Otherwise, the playbook -will be considered to have failed. - -* R-43253 The xNF **MUST** use playbooks designed to allow Ansible - Server to infer failure or success based on the “PLAY_RECAP” capability. - NOTE: There are cases where playbooks need to interpret results of a task - and then determine success or failure and return result accordingly - (failure for failed tasks). -* R-50252 The xNF **MUST** write to a specific one text files that - will be retrieved and made available by the Ansible Server if, as part - of a xNF action (e.g., audit), a playbook is required to return any - xNF information. The text files must be written in the same directory as - the one from which the playbook is being executed. A text file must be - created for the xNF playbook run targets/affects, with the name - ‘<VNFname>_results.txt’ into which any desired output from each - respective VM/xNF must be written. -* R-51442 The xNF **SHOULD** use playbooks that are designed to - automatically ‘rollback’ to the original state in case of any errors - for actions that change state of the xNF (e.g., configure). - - NOTE: In case rollback at the playbook level is not supported or possible, - the xNF provider shall provide alternative locking mechanism (e.g., for a - small xNF the rollback mechanism may rely on workflow to terminate and - re-instantiate VNF VMs and then re-run playbook(s)). Backing up updated - files also recommended to support rollback when soft rollback is feasible. - -* R-58301 The xNF **SHOULD NOT** use playbooks that make requests to - Cloud resources e.g. Openstack (nova, neutron, glance, heat, etc.); - therefore, there is no use for Cloud specific variables like Openstack - UUIDs in Ansible Playbooks. - - Rationale: Flows that require interactions with Cloud services - e.g. Openstack shall rely on workflows run by an Orchestrator - (Change Management) or - other capability (such as a control loop or Operations GUI) outside - Ansible Server which can be executed by a Controller such as APPC. - There are policies, as part of Control Loop models, that send remediation - action requests to APPC; these are triggered as a response to an event - or correlated events published to Event Bus. - -* R-02651 The xNF **SHOULD** use the Ansible backup feature to save a - copy of configuration files before implementing changes to support - operations such as backing out of software upgrades, configuration - changes or other work as this will help backing out of configuration - changes when needed. -* R-43353 The xNF **MUST** return control from Ansible Playbooks only - after tasks are fully complete, signaling that the playbook completed - all tasks. When starting services, return control only after all services - are up. This is critical for workflows where the next steps are dependent - on prior tasks being fully completed. - - Detailed examples: - - StopApplication Playbook – StopApplication Playbook shall return control - and a completion status only after VNF application is fully stopped, all - processes/services stopped. - StartApplication Playbook – StartApplication Playbook shall return control - and a completion status only after all VNF application services are fully up, - all processes/services started and ready to provide services. NOTE: Start - Playbook should not be declared complete/done after starting one or several - processes that start the other processes. - - HealthCheck Playbook: - - SUCCESS – HealthCheck success shall be returned (return code 0) by a - Playbook or Cookbook only when VNF is 100% healthy, ready to take requests - and provide services, with all VNF required capabilities ready to provide - services and with all active and standby resources fully ready with no - open MINOR, MAJOR or CRITICAL alarms. - - NOTE: In some cases, a switch may need to be turned on, but a VNF - reported as healthy, should be ready to take service requests or be - already processing service requests successfully. - - A successful execution of a health-check playbook shall also create one - file per VNF VM, named after the VNF instance name followed by - “_results.txt (<vnf_instance>_results.txt) to indicate health-check was - executed and completed successfully, example: vfdb9904v_results.txt, - with the following contents: - -.. code-block:: java - - { - "identifier": "VNF", - "state": "healthy", - "time": "2018-03-16:1139" - } - -Example: - -.. code-block:: java - - $ cat vfdb9904v_results.txt - { - "identifier": "VNF", - "state": "healthy", - "time": "2018-03-16:1139" - } -.. - - FAILURE – A health check playbook shall return a non-zero return code in - case VNF is not 100% healthy because one or more VNF application processes - are stopped or not ready to take service requests or because critical or - non-critical resources are not ready or because there are open MINOR, MAJOR - or CRITICAL traps/alarms or because there are issues with the VNF that - need attention even if they do not impact services provided by the VNF. - - A failed health-check playbook shall also create one file per VNF, - named after the VNF instance name, followed by - “_results.txt to indicate health-check was executed and found issues - in the health of the VNF. This is to differentiate from failure to - run health-check playbook or playbook tasks to verify the health of the VNF, - example: vfdb9904v_results.txt, with the following contents: - -.. code-block:: java - - { - "identifier": "VNF", - "state": "unhealthy", - "info": "Error in following VM(s). Check hcstatus files - under /tmp/ccfx9901v for details", - "fault": [ - "vfdb9904vm001", - "vfdb9904vm002" - ], - "time": "2018-03-16:4044" - } -.. - - Example: - -.. code-block:: java - - $ cat vfdb9904v_results.txt - { - "identifier": "VNF", - "state": "unhealthy", - "info": "Error in following VM(s). Check hcstatus files - under /tmp/ccfx9901v for details", - "fault": [ - "vfdb9904vm001", - "vfdb9904vm002" - ], - "time": "2018-03-16:4044" - } -.. - - See `VNF REST APIs`_ for additional details on HealthCheck. - -ONAP Controller / Ansible API Usage -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - -This section outlines the workflow that ONAP Controller invokes when -it receives an action request against an Ansible managed VNF. - - #. When ONAP Controller receives a request for an action for an - AnsibleManaged VNF, it retrieves the corresponding template (based - on **action** and **VNF**) from its database and sets necessary - values (such as an Id, NodeList, and EnvParameters) from either - information in the request or data obtained from other sources. - This is referred to as the payload that is sent as a JSON object - to the Ansible server. - #. The ONAP Controller sends a request to the Ansible server to - execute the action. - #. The ONAP Controller polls the Ansible Server for result (success - or failure). The ONAP Controllers has a timeout value which is - contained in the template. If the result is not available when the - timeout is reached, the ONAP Controller stops polling and returns a - timeout error to the requester. The Ansible Server continues to - process the request. - - -Support of Controller Commands And Southbound Protocols -^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ - -The following table summarizes the commands and possible protocols selected. -Note that the HealthCheck can also be supported via REST. - -Table 8. ONAP Controller APIs and NETCONF Commands - -+-------------+--------------------+--------------------+--------------------+ -|**Command** |**NETCONF Support** |**Chef Support** |**Ansible** | -+=============+====================+====================+====================+ -|General |For each RPC, the |VNF Vendor must |VNF Vendor must | -|Comments |appropriate RPC |provide any |provide an Ansible | -| |operation is listed.|necessary roles, |playbook to retrieve| -| | |cookbooks, recipes |the running | -| | |to retrieve the |configuration from a| -| | |running |VNF and place the | -| | |configuration from |output on the | -| | |a VNF and place it |Ansible server in | -| | |in the respective |a manner aligned | -| | |Node Objects |with playbook | -| | |‘PushJobOutput’ |requirements listed | -| | |attribute of all |in this document. | -| | |nodes in NodeList | | -| | |when triggered |The PlaybookName | -| | |by a chef-client |must be provided | -| | |run. |in the JSON file. | -| | | | | -| | |The JSON file for |NodeList must list | -| | |this VNF action is |IP addresses or DNS | -| | |required to set |supported FQDNs of | -| | |“PushJobFlag” to |an example VNF | -| | |“True” and |on which to | -| | |“GetOutputFlag” to |execute playbook. | -| | |“True”. The “Node” | | -| | |JSON dictionary | | -| | |must have the run | | -| | |list populated | | -| | |with the necessary | | -| | |sequence of roles, | | -| | |cookbooks, recipes. | | -| | | | | -| | |The Environment | | -| | |and Node values | | -| | |should contain all | | -| | |appropriate | | -| | |configuration | | -| | |attributes. | | -| | | | | -| | |NodeList must | | -| | |list sample FQDNs | | -| | |that are required to| | -| | |conduct a | | -| | |chef-client run for | | -| | |this VNF Action. | | -+-------------+--------------------+--------------------+--------------------+ -|Audit |The <get-config> is |Supported via a |Supported via a | -| |used to return the |cookbook that |playbook that | -| |running |returns the running |returns the running | -| |configuration. |configuration. |configuration. | -+-------------+--------------------+--------------------+--------------------+ -|Configure, |The <edit-config> |Supported via a |Supported via a | -|ModifyConfig |operation loads all |cookbook that |playbook that | -| |or part of a |updates the VNF |updates the VNF | -| |specified data set |configuration. |configuration. | -| |to the specified | | | -| |target database. If | | | -| |there is no | | | -| |<candidate/> | | | -| |database, then the | | | -| |target is the | | | -| |<running/> database.| | | -| |A <commit> follows. | | | -+-------------+--------------------+--------------------+--------------------+ -|Other |This command has no |Supported via a |Supported via a | -|Configuration|existing NETCONF RPC|cookbook that |playbook that | -|Commands |action. |performs |performs | -| | |the action. |the action. | -+-------------+--------------------+--------------------+--------------------+ -|Lifecycle |This command has no |Supported via a |Supported via a | -|Management |existing NETCONF RPC|cookbook that |playbook that | -|Commands |action. |performs |performs | -| | |the action. |the action. | -+-------------+--------------------+--------------------+--------------------+ -|Health Check |This command has no |Supported via a |Supported | -| |existing NETCONF RPC|cookbook |via a | -| |action. |that |playbook | -| | |performs |that | -| | |a HealthCheck and |performs | -| | |returns the results.|the | -| | | |HealthCheck | -| | | |and returns | -| | | |the | -| | | |results. | -+-------------+--------------------+--------------------+--------------------+ - -Monitoring & Management --------------------------------------------------- - -This section addresses data collection and event processing -functionality that is directly dependent on the interfaces -provided by the VNFs’ APIs. These can be in the form of asynchronous -interfaces for event, fault notifications, and autonomous data streams. -They can also be synchronous interfaces for on-demand requests to -retrieve various performance, usage, and other event information. - -The target direction for VNF interfaces is to employ APIs that are -implemented utilizing standardized messaging and modeling protocols -over standardized transports. Migrating to a virtualized environment -presents a tremendous opportunity to eliminate the need for proprietary -interfaces for VNF provider equipment while removing the traditional -boundaries between Network Management Systems and Element Management -Systems. Additionally, VNFs provide the ability to instrument the -networking applications by creating event records to test and monitor -end-to-end data flow through the network, similar to what physical or -virtual probes provide without the need to insert probes at various -points in the network. The VNF providers must be able to provide the -aforementioned set of required data directly to the ONAP collection -layer using standardized interfaces. - -Data Model for Event Records -^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ - -This section describes the data model for the collection of telemetry -data from VNFs by Service Providers (SPs) to manage VNF health and -runtime lifecycle. This data model is referred to as the VNF Event -Streaming (VES) specifications. While this document is focused on -specifying some of the records from the ONAP perspective, there may -be other external bodies using the same framework to specify additional -records. For example, OPNFV has a VES project that is looking to specify -records for OpenStack’s internal telemetry to manage Application (VNFs), -physical and virtual infrastructure (compute, storage, network devices), -and virtual infrastructure managers (cloud controllers, SDN controllers). -Note that any configurable parameters for these data records (e.g., -frequency, granularity, policy-based configuration) will be managed -using the “Configuration” framework described in the prior sections -of this document. - -The Data Model consists of: - -- Common Header Record: This data structure precedes each of the - Technology Independent and Technology Specific records sections of - the data model. - -- Technology Independent Records: This version of the document - specifies the model for Fault, Heartbeat, State Change, Syslog, - Threshold Crossing Alerts, and VNF Scaling* (short for - measurementForVfScalingFields – actual name used in JSON - specification) records. In the future, these may be extended to - support other types of technology independent records. Each of - these records allows additional fields (name/ value pairs) for - extensibility. The VNF provider can use these VNF Provider-specific - additional fields to provide additional information that may be - relevant to the managing systems. - -- Technology Specific Records: This version of the document specifies - the model for Mobile Flow records, Signaling and Voice Quality records. - In the future, these may be extended to support other types of records - (e.g. Network Fabric, Security records, etc.). Each of these records - allows additional fields (name/value pairs) for extensibility. The VNF - providers can use these VNF-specific additional fields to provide - additional information that may be relevant to the managing systems. - A placeholder for additional technology specific areas of interest to - be defined in the future documents has been depicted. - -|image0| - -Figure 1. Data Model for Event Records - -Event Records - Data Structure Description -^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ - -The data structure for event records consists of: - -- a Common Event Header block; - -- zero or more technology independent domain blocks; and - - - e.g., Fault domain, State Change domain, Syslog domain, etc. - -- zero or more technology specific domain blocks. - - - e.g., Mobile Flow domain, Signaling domain, Voice Quality domain, - etc. - -Common Event Header -~~~~~~~~~~~~~~~~~~~~~ - -The common header that precedes any of the domain-specific records contains -information identifying the type of record to follow, information about -the sender and other identifying characteristics related to timestamp, -sequence number, etc. - -Technology Independent Records – Fault Fields -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - -The Fault Record, describing a condition in the Fault domain, contains -information about the fault such as the entity under fault, the -severity, resulting status, etc. - -Technology Independent Records – Heartbeat Fields -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - -The Heartbeat Record provides an optional structure for communicating -information about heartbeat or watchdog signaling events. It can -contain information about service intervals, status information etc. -as required by the heartbeat implementation. - -Note: Heartbeat records would only have the Common Event Header block. -An optional heartbeat domain is available if required by the heartbeat -implementation. - -Technology Independent Records – State Change Fields -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - -The State Change Record provides a structure for communicating information -about data flow through the VNF. It can contain information about state -change related to physical device that is reported by VNF. As an example, -when cards or port name of the entity that has changed state. - -Technology Independent Records – Syslog Fields -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - -The Syslog Record provides a structure for communicating any type of -information that may be logged by the VNF. It can contain information -about system internal events, status, errors, etc. - -Technology Independent Records – Threshold Crossing Alert Fields -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - -The Threshold Crossing Alert (TCA) Record provides a structure for -communicating information about threshold crossing alerts. It can -contain alert definitions and types, actions, events, timestamps -and physical or logical details. - -Technology Independent Records - VNF Scaling Fields -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - -The VNF Scaling\* (short for measurementForVfScalingFields – -actual name used in JSON specification) Record contains information -about VNF and VNF resource structure and its condition to help in -the management of the resources for purposes of elastic scaling. - -Technology Independent Records – otherFields -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - -The otherFields Record defines fields for events belonging to the -otherFields domain of the Technology Independent domain enumeration. -This record provides a mechanism to convey a complex set of fields -(possibly nested or opaque) and is purely intended to address -miscellaneous needs such as addressing time-to-market considerations -or other proof-of-concept evaluations. Hence, use of this record -type is discouraged and should be minimized. - -Technology Specific Records – Mobile Flow Fields -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - -The Mobile Flow Record provides a structure for communicating -information about data flow through the VNF. It can contain -information about connectivity and data flows between serving -elements for mobile service, such as between LTE reference points, etc. - -Technology Specific Records – Signaling Fields -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - -The Signaling Record provides a structure for communicating information -about signaling messages, parameters and signaling state. It can -contain information about data flows for signaling and controlling -multimedia communication sessions such as voice and video calls. - -Technology Specific Records – Voice Quality Fields -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -The Voice Quality Record provides a structure for communicating information -about voice quality statistics including media connection information, -such as transmitted octet and packet counts, packet loss, packet delay -variation, round-trip delay, QoS parameters and codec selection. - -Technology Specific Records – Future Domains -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - -The futureDomains Record is a placeholder for additional technology -specific areas of interest that will be defined and described -in the future documents. - -Data Structure Specification of the Event Record -^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ - -For additional information on the event record formats of the data -structures mentioned above, please refer to `VES Event -Listener <https://github.com/att/evel-test-collector/tree/master/docs/att_interface_definition>`__. - -Transports and Protocols Supporting Resource Interfaces -^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ - -Delivery of data from VNFs to ONAP must use the common transport -mechanisms and protocols for all VNFs as defined in this document. -Transport mechanisms and protocols have been selected to enable both -high volume and moderate volume datasets, as well as asynchronous and -synchronous communications over secure connections. The specified -encoding provides self-documenting content, so data fields can be -changed as needs evolve, while minimizing changes to data delivery. - -The term ‘Event Record’ is used throughout this document to represent -various forms of telemetry or instrumentation made available by the -VNF including, faults, status events, various other types of VNF -measurements and logs. Headers received by themselves must be used -as heartbeat indicators. Common structures and delivery protocols for -other types of data will be given in future versions of this document -as we get more insight into data volumes and required processing. - -In the following sections, we provide options for encoding, serialization -and data delivery. Agreements between Service Providers and VNF providers -shall determine which encoding, serialization and delivery method to use -for particular data sets. The selected methods must be agreed to prior to -the on-boarding of the VNF into ONAP design studio. - -VNF Telemetry using VES/JSON Model -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - -The preferred model for data delivery from a VNF to ONAP DCAE is -the JSON driven model as depicted in Figure 2. - -|image1| - -Figure 2. VES/JSON Driven Model - -VNF providers will provide a YAML artifact to the Service Provider -that describes: - -* standard VES/JSON model information elements (key/values) that - the VNF provides -* any additional non-standard (custom) VES/JSON model information - elements (key/values) that the VNF provides - -Using the semantics and syntax supported by YAML, VNF providers -will indicate specific conditions that may arise, and recommend -actions that should be taken at specific thresholds, or if specific -conditions repeat within a specified time interval. - -Based on the VNF provider's recommendations, the Service Provider may -create additional YAML artifacts (using ONAP design Studio), which -finalizes Service Provider engineering rules for the processing of -the VNF events. The Service Provider may alter the threshold levels -recommended by the VNF providor, and may modify and more clearly -specify actions that should be taken when specified conditions arise. -The Service Provider-created version of the YAML artifact will be -distributed to ONAP applications by the Design framework. - -VNF Telemetry using YANG Model -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - -In addition to the JSON driven model described above, a YANG -driven model can also be supported, as depicted in Figure 3. - -|image2| - -Figure 3. YANG Driven Model - -VNF providers will provide to the Service Provider the following -YANG model artifacts: - -* common IETF YANG modules that support the VNF -* native (VNF provider-supplied) YANG modules that support the VNF -* open (OpenConfig) YANG modules and the following - configuration-related information, including: - - * telemetry configuration and operational state data; such as: - - * sensor paths - * subscription bindings - * path destinations - * delivery frequency - * transport mechanisms - * data encodings - -* a YAML artifact that provides all necessary mapping relationships - between YANG model data types to VES/JSON information elements -* YANG helper or decoder functions that automate the conversion between - YANG model data types to VES/JSON information elements -* OPTIONAL: YANG Telemetry modules in JSON format per RFC 7951 - -Using the semantics and syntax supported by YANG, VNF providers -will indicate specific conditions that may arise, and recommend -actions that should be taken at specific thresholds, or if specific -conditions repeat within a specified time interval. - -Based on the VNF provider's recommendations, the Service Provider may -create additional YAML artifacts (using ONAP design Studio), which -finalizes Service Provider engineering rules for the processing of the -VNF events. The Service Provider may alter the threshold levels recommended -by the VNF provider, and may modify and more clearly specify actions that -should be taken when specified conditions arise. The Service -Provided-created version of the YAML will be distributed to ONAP -applications by the Design framework. - -Note: While supporting the YANG model described above, we are still -leveraging the VES JSON based model in DCAE. The purpose of the -diagram above is to illustrate the concept only and not to imply a -specific implementation. - -VNF Telemetry using Google Protocol Buffers -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - -In addition to the data delivery models described above, support for -delivery of VNF telemetry using Google Protocol Buffers (GPB) can -also be supported, as depicted in Figure 4. - -VNF providers will provide to the Service Provider the additional -following artifacts to support the delivery of VNF telemetry to DCAE -via the open-source gRPC mechanism using Google's Protocol Buffers: - -* the YANG model artifacts described in support of the - "VNF Telemetry using YANG Model" -* valid definition file(s) for all GPB / KV-GPB encoded messages -* valid definition file(s) for all gRPC services -* gRPC method parameters and return types specified as Protocol - Buffers messages - -|image3| - -Figure 4. Protocol Buffers Driven Model - -Note: if Google Protocol Buffers are employed for delivery of VNF -telemetry, Key-Value Google Protocol Buffers (KV-GPB) is the -preferred serialization method. Details of specifications and -versioning corresponding to a release can be found at: -`VES Event Listener <https://github.com/att/evel-test-collector/tree/master/docs/att_interface_definition>`__. - -Note: While supporting the VNF telemetry delivery approach described above, -we are still leveraging the VES JSON based model in DCAE. The purpose of -the diagram above is to illustrate the concept only and not to imply a -specific implementation. - -Monitoring & Management Requirements -^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ - -VNF telemetry via standardized interface -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - -* R-51910 The xNF **MUST** provide all telemetry (e.g., fault event - records, syslog records, performance records etc.) to ONAP using the - model, format and mechanisms described in this section. - -Encoding and Serialization -~~~~~~~~~~~~~~~~~~~~~~~~~~~ - -Content delivered from VNFs to ONAP is to be encoded and serialized using JSON: - -JSON -~~~~~~~~~~~~~~~~~~ - -* R-19624 The xNF **MUST** encode and serialize content delivered to - ONAP using JSON (RFC 7159) plain text format. High-volume data - is to be encoded and serialized using `Avro <http://avro.apache.org/>`_, where the Avro [5]_ data format are described using JSON. - - Note: - - - JSON plain text format is preferred for moderate volume data sets - (option 1), as JSON has the advantage of having well-understood simple - processing and being human-readable without additional decoding. Examples - of moderate volume data sets include the fault alarms and performance - alerts, heartbeat messages, measurements used for xNF scaling and syslogs. - - Binary format using Avro is preferred for high volume data sets - (option 2) such as mobility flow measurements and other high-volume - streaming events (such as mobility signaling events or SIP signaling) - or bulk data, as this will significantly reduce the volume of data - to be transmitted. As of the date of this document, all events are - reported using plain text JSON and REST. - - Avro content is self-documented, using a JSON schema. The JSON schema is - delivered along with the data content - (http://avro.apache.org/docs/current/ ). This means the presence and - position of data fields can be recognized automatically, as well as the - data format, definition and other attributes. Avro content can be - serialized as JSON tagged text or as binary. In binary format, the - JSON schema is included as a separate data block, so the content is - not tagged, further compressing the volume. For streaming data, Avro - will read the schema when the stream is established and apply the - schema to the received content. - -In addition to the preferred method (JSON), content can be delivered -from xNFs to ONAP can be encoded and serialized using Google Protocol -Buffers (GPB). - -KV-GPB/GPB -~~~~~~~~~~~~~~~~~~ - -Telemetry data delivered using Google Protocol Buffers v3 (proto3) -can be serialized in one of the following methods: - -* Key-value Google Protocol Buffers (KV-GPB) is also known as - self-describing GPB: - - * keys are strings that correspond to the path of the system - resources for the VNF being monitored. - * values correspond to integers or strings that identify the - operational state of the VNF resource, such a statistics counters - and the state of a VNF resource. - -* VNF providers must supply valid KV-GPB definition file(s) to allow - for the decoding of all KV-GPB encoded telemetry messages. - -* Native Google Protocol Buffers (GPB) is also known as compact GPB: - - * keys are represented as integers pointing to the system resources for - the VNF being monitored. - * values correspond to integers or strings that identify the operational - state of the VNF resource, such a statistics counters and the state - of a VNF resource. - -* Google Protocol Buffers (GPB) requires metadata in the form of .proto - files. VNF providers must supply the necessary GPB .proto files such that - GPB telemetry messages can be encoded and decoded. - -* In the future, we may consider support for other types of - encoding & serialization methods based on industry demand. - - -Reporting Frequency -~~~~~~~~~~~~~~~~~~~~~ - -* R-98191 The xNF **MUST** vary the frequency that asynchronous data - is delivered based on the content and how data may be aggregated or - grouped together. - - Note: - - - For example, alarms and alerts are expected to be delivered as - soon as they appear. In contrast, other content, such as - performance measurements, KPIs or reported network signaling may have - various ways of packaging and delivering content. Some content should - be streamed immediately; or content may be monitored over a time interval, - then packaged as collection of records and delivered as block; or data - may be collected until a package of a certain size has been collected; - or content may be summarized statistically over a time interval, or - computed as a KPI, with the summary or KPI being delivered. - - We expect the reporting frequency to be configurable depending - on the virtual network function’s needs for management. For example, - Service Provider may choose to vary the frequency of collection between - normal and trouble-shooting scenarios. - - Decisions about the frequency of data reporting will affect the - size of delivered data sets, recommended delivery method, and how the - data will be interpreted by ONAP. These considerations should not - affect deserialization and decoding of the data, which will be guided - by the accompanying JSON schema or GPB definition files. - -Addressing and Delivery Protocol -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - -ONAP destinations can be addressed by URLs for RESTful data PUT. Future -data sets may also be addressed by host name and port number for TCP -streaming, or by host name and landing zone directory for SFTP transfer -of bulk files. - -* R-88482 The xNF **SHOULD** use REST using HTTPS delivery of plain - text JSON for moderate sized asynchronous data sets, and for high - volume data sets when feasible. -* R-84879 The xNF **MUST** have the capability of maintaining a primary - and backup DNS name (URL) for connecting to ONAP collectors, with the - ability to switch between addresses based on conditions defined by policy - such as time-outs, and buffering to store messages until they can be - delivered. At its discretion, the service provider may choose to populate - only one collector address for a xNF. In this case, the network will - promptly resolve connectivity problems caused by a collector or network - failure transparently to the xNF. -* R-81777 The xNF **MUST** be configured with initial address(es) to use - at deployment time. Subsequently, address(es) may be changed through - ONAP-defined policies delivered from ONAP to the xNF using PUTs to a - RESTful API, in the same manner that other controls over data reporting - will be controlled by policy. -* R-08312 The xNF **MAY** use another option which is expected to include REST - delivery of binary encoded data sets. -* R-79412 The xNF **MAY** use another option which is expected to include TCP - for high volume streaming asynchronous data sets and for other high volume - data sets. TCP delivery can be used for either JSON or binary encoded data - sets. -* R-01033 The xNF **MAY** use another option which is expected to include SFTP - for asynchronous bulk files, such as bulk files that contain large volumes of - data collected over a long time interval or data collected across many xNFs. - (Preferred is to reorganize the data into more frequent or more focused data - sets, and deliver these by REST or TCP as appropriate.) -* R-63229 The xNF **MAY** use another option which is expected to include REST - for synchronous data, using RESTCONF (e.g., for xNF state polling). -* R-03070 The xNF **MUST**, by ONAP Policy, provide the ONAP addresses - as data destinations for each xNF, and may be changed by Policy while - the xNF is in operation. We expect the xNF to be capable of redirecting - traffic to changed destinations with no loss of data, for example from - one REST URL to another, or from one TCP host and port to another. - -Asynchronous and Synchronous Data Delivery -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - -* R-06924 The xNF **MUST** deliver asynchronous data as data becomes - available, or according to the configured frequency. -* R-73285 The xNF **MUST** must encode, address and deliver the data - as described in the previous paragraphs. -* R-42140 The xNF **MUST** respond to data requests from ONAP as soon - as those requests are received, as a synchronous response. -* R-34660 The xNF **MUST** use the RESTCONF/NETCONF framework used by - the ONAP configuration subsystem for synchronous communication. -* R-86586 The xNF **MUST** use the YANG configuration models and RESTCONF - [RFC8040] (https://tools.ietf.org/html/rfc8040). -* R-11240 The xNF **MUST** respond with content encoded in JSON, as - described in the RESTCONF specification. This way the encoding of a - synchronous communication will be consistent with Avro. -* R-70266 The xNF **MUST** respond to an ONAP request to deliver the - current data for any of the record types defined in - `Event Records - Data Structure Description`_ by returning the requested - record, populated with the current field values. (Currently the defined - record types include fault fields, mobile flow fields, measurements for - xNF scaling fields, and syslog fields. Other record types will be added - in the future as they become standardized and are made available.) -* R-46290 The xNF **MUST** respond to an ONAP request to deliver granular - data on device or subsystem status or performance, referencing the YANG - configuration model for the xNF by returning the requested data elements. -* R-43327 The xNF **SHOULD** use `Modeling JSON text with YANG - <https://tools.ietf.org/html/rfc7951>`_, If YANG models need to be - translated to and from JSON{RFC7951]. YANG configuration and content can - be represented via JSON, consistent with Avro, as described in “Encoding - and Serialization” section. - -Security -~~~~~~~~~~ - -* R-42366 The xNF **MUST** support secure connections and transports such as - Transport Layer Security (TLS) protocol - [`RFC5246 <https://tools.ietf.org/html/rfc5246>`_] and should adhere to - the best current practices outlined in - `RFC7525 <https://tools.ietf.org/html/rfc7525>`_. -* R-44290 The xNF **MUST** control access to ONAP and to xNFs, and creation - of connections, through secure credentials, log-on and exchange mechanisms. -* R-47597 The xNF **MUST** carry data in motion only over secure connections. -* R-68165 The xNF **MUST** encrypt any content containing Sensitive Personal - Information (SPI) or certain proprietary data, in addition to applying the - regular procedures for securing access and delivery. - - -.. [1] - https://github.com/mbj4668/pyang - -.. [2] - Recall that the Node Object **is required** to be identical across - all VMs of a VNF invoked as part of the action except for the “name”. - -.. [3] - Upstream elements must provide the appropriate FQDN in the request to - ONAP for the desired action. - -.. [4] - Multiple ONAP actions may map to one playbook. - -.. [5] - This option is not currently supported in ONAP and it is currently - under consideration. - -.. |image0| image:: Data_Model_For_Event_Records.png - :width: 7in - :height: 8in - - -.. |image1| image:: VES_JSON_Driven_Model.png - :width: 5in - :height: 3in - -.. |image2| image:: YANG_Driven_Model.png - :width: 5in - :height: 3in - -.. |image3| image:: Protocol_Buffers_Driven_Model.png - :width: 4.74in - :height: 3.3in - |