Telemetry Data Export capability
draft-tao-netconf-data-export-capabilities-01
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Authors | Qin Wu , Liang Geng , Peng Liu | ||
Last updated | 2020-07-12 | ||
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draft-tao-netconf-data-export-capabilities-01
NETCONF Working Group Q. Wu Internet-Draft Huawei Intended status: Standards Track L. Geng Expires: January 13, 2021 P. Liu China Mobile July 12, 2020 Telemetry Data Export capability draft-tao-netconf-data-export-capabilities-01 Abstract This document proposes a YANG module for telemetry data export capability which augments system Capabilities model and provides additional telemetry data export attributes associated with system capability for transport dependent capability negotiation. Status of This Memo This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at https://datatracker.ietf.org/drafts/current/. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." This Internet-Draft will expire on January 13, 2021. Copyright Notice Copyright (c) 2020 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (https://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of Wu, et al. Expires January 13, 2021 [Page 1] Internet-Draft Data Export Capability July 2020 the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 1.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 2 2. Data Export capability . . . . . . . . . . . . . . . . . . . 3 2.1. Tree Diagram . . . . . . . . . . . . . . . . . . . . . . 4 3. YANG Module . . . . . . . . . . . . . . . . . . . . . . . . . 4 4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 11 4.1. Updates to the IETF XML Registry . . . . . . . . . . . . 11 4.2. Updates to the YANG Module Names Registry . . . . . . . . 11 5. Security Considerations . . . . . . . . . . . . . . . . . . . 12 6. Contributors . . . . . . . . . . . . . . . . . . . . . . . . 13 7. References . . . . . . . . . . . . . . . . . . . . . . . . . 13 7.1. Normative References . . . . . . . . . . . . . . . . . . 13 7.2. Informative References . . . . . . . . . . . . . . . . . 14 Appendix A. Usage Example of interaction between telemetry data export capabilities and Adaptive Subscription . . . 14 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 17 1. Introduction Notification capability model defined in [I-D.netconf-notification- capabilities] allows a client to discover a set of capabilities supported by the server (e.g., basic system capability and YANG-Push related capabilities) both at implementation-time and run-time. These "capabilities" permit the client to adjust its behavior to take advantage of the features exposed by the device. However pre-configuration for some transport specific parameters (e.g., transport protocol, encoding format, encryption by the client is still inevitable, which may cause unexpected failure and additional message exchange between client and server. This document proposes a YANG module for telemetry data export capability which augments System Capabilities model and provide additional data export attributes for transport dependent capability negotiation. 1.1. Terminology The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all capitals, as shown here. Wu, et al. Expires January 13, 2021 [Page 2] Internet-Draft Data Export Capability July 2020 2. Data Export capability The YANG module ietf-notification-capabilities defined in [I- D.netconf-notification-capabilities] specify the following server capabilities related to YANG Push: o A set of capabilities related to the amount of notifications the server can send out o Specification of which data nodes support on-change notifications. o Capability values can be specified on server level, datastore level or on specific data nodes (and their contained sub-tree) of a specific datastore. Capability values on a smaller, more specific part of the server's data always override more generic values. o On-change capability is not specified on a server level as different datastores usually have different on-change capabilities. On a datastore level on-change capability for configuration and state data can be specified separately. These server capabilities are transport independent and session level capabilities and can be provided either at implementation time or reported at run time. This document augments system Capabilities model and provides additional data export attributes associated with system capabilities: o Specification of transport protocol the client can use to establish transport connection; o Specification of encoding selection(e.g., XML or JSON, to binary) of Data Modeled with YANG; o Specification of secure transport mechanisms that are needed by the client to communicate with the server; o Specification of the type of data compression algorithm (e.g., lossless data compression) the client can use for file compression and decompression o Specification of Maximum number of data nodes that can be sent in a group of data node with the same characteristics; Wu, et al. Expires January 13, 2021 [Page 3] Internet-Draft Data Export Capability July 2020 o Specification of the number of sensors group. A sensor group represents a resuable grouping of multiple paths and exclude filters. o Specification of the notification message encapsulation type, either one notification per message or multiple notifications per message. o Specification of the type of subscription, e.g., periodic subscrption, on-change subscription, bulk subscription, adaptive subscription. o Specification of the update trigger type such as timer event based trigger, count threshold trigger, redundant suppression. 2.1. Tree Diagram The following tree diagram [RFC8340] provides an overview of the data model. module: ietf-data-export-capabilities augment /sysc:system-capabilities: +--ro data-export-capabilities +--ro transport-protocol? identityref +--ro encoding-format? identityref +--ro security-protocol? identityref +--ro compression-mode? identityref +--ro max-nodes-per-sensor-group? uint32 +--ro max-sensor-group-per-update? uint32 augment /sysc:system-capabilities/inc:subscription-capabilities: +--ro data-export-capabilities +--ro message-bundling-support? boolean +--ro subscription-mode? identityref augment /sysc:system-capabilities/sysc:datastore-capabilities/sysc:per-node-capabilities: +--ro data-export-capabilities +--ro timer-event-support? boolean +--ro sampling-interval* [] | +--ro observable-period centiseconds | +--ro count? uint16 | +--ro anchor-time? yang:date-and-time +--ro counter-threshold-support? boolean +--ro suppress-redundant? boolean 3. YANG Module <CODE BEGINS> file "ietf-data-export-capabilities.yang" module ietf-data-export-capabilities { yang-version 1.1; Wu, et al. Expires January 13, 2021 [Page 4] Internet-Draft Data Export Capability July 2020 namespace "urn:ietf:params:xml:ns:yang:ietf-data-export-capabilities"; prefix dec; import ietf-system-capabilities { prefix sysc; } import ietf-notification-capabilities { prefix inc; } import ietf-yang-types { prefix yang; } organization "IETF NETCONF (Network Configuration) Working Group"; contact "WG Web: <https://tools.ietf.org/wg/netconf/> WG List: <mailto:netconf@ietf.org> Editor: Qin Wu <mailto:bill.wu@huawei.com"; description "This module defines an extension to System Capability and YANG Push Notification Capabilities model and provides additional data export attributes for transport dependent capability negotiation. Copyright (c) 2019 IETF Trust and the persons identified as authors of the code. All rights reserved. Redistribution and use in source and binary forms, with or without modification, is permitted pursuant to, and subject to the license terms contained in, the Simplified BSD License set forth in Section 4.c of the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info). This version of this YANG module is part of RFC XXXX; see the RFC itself for full legal notices."; revision 2020-07-03 { description "Initial revision."; reference "RFC XXXX: Telemetry Data Export capability"; } identity transport-protocol { description "Base identity for transport protocol type."; Wu, et al. Expires January 13, 2021 [Page 5] Internet-Draft Data Export Capability July 2020 } identity tcp { base transport-protocol; description "Identity for tcp transport protocol."; } identity udp { base transport-protocol; description "Identity for udp transport protocol."; } identity grpc { base transport-protocol; description "Identity for grpc transport protocol."; } identity security-protocol { description "Base identity for security protocol type."; } identity tls { base security-protocol; description "Identity for tls security protocol."; } identity ssh { base security-protocol; description "Identity for ssh transport protocol."; } identity encoding-format { description "Base identity for encoding format type."; } identity xml { base encoding-format; description "Identity for xml encoding format."; } Wu, et al. Expires January 13, 2021 [Page 6] Internet-Draft Data Export Capability July 2020 identity json { base encoding-format; description "Identity for json encoding format."; } identity gpb { base encoding-format; description "Identity for gpb encoding format."; } identity cbor { base encoding-format; description "Identity for cbor encoding format."; } identity compression-mode { description "Base identity for compression mode."; } identity gzip { base security-protocol; description "Identity for gzip compression mode."; } identity deflate { base security-protocol; description "Identity for deflate compression mode."; } identity subscription-mode { description "Base identity for subscription mode."; } identity periodic { base subscription-mode; description "Identity for periodic subscription mode."; } identity on-change { base subscription-mode; Wu, et al. Expires January 13, 2021 [Page 7] Internet-Draft Data Export Capability July 2020 description "Identity for on change subscription mode."; } identity event { base subscription-mode; description "Identity for event based subscription mode."; } typedef centiseconds { type uint32; description "A period of time, measured in units of 0.01 seconds."; } augment "/sysc:system-capabilities" { description "Add system level capability."; container data-export-capabilities { description "Capabilities related to telemetry data export capability negotiation."; leaf transport-protocol { type identityref { base transport-protocol; } description "Type of transport protocol."; } leaf encoding-format { type identityref { base encoding-format; } description "Type of encoding format."; } leaf security-protocol { type identityref { base security-protocol; } description "Type of secure transport."; } leaf compression-mode { type identityref { base compression-mode; } description Wu, et al. Expires January 13, 2021 [Page 8] Internet-Draft Data Export Capability July 2020 "Type of compression mode."; } leaf max-nodes-per-sensor-group { type uint32 { range "1..max"; } description "Maximum number of selected data nodes that can be sent per sensor group."; } leaf max-sensor-group-per-update { type uint32 { range "1..max"; } description "Maximum number of sensor groups that can be sent in an update."; } } } augment "/sysc:system-capabilities/inc:subscription-capabilities" { description "Add subscription level capability."; container data-export-capabilities { description "Capabilities related to telemetry data export capability negotiation."; leaf message-bundling-support { type boolean; default "false"; description "Enables message bundling support."; } leaf subscription-mode { type identityref { base subscription-mode; } description "Type of subscription mode."; } } } augment "/sysc:system-capabilities/sysc:datastore-capabilities/sysc:per-node-capabilities" { description "Add datastore and node level capability."; container data-export-capabilities { description "Capabilities related to telemetry data export capability negotiation."; leaf timer-event-support { Wu, et al. Expires January 13, 2021 [Page 9] Internet-Draft Data Export Capability July 2020 type boolean; default "false"; description "Set to true if the subscription mode is event based subscription mode and timer based trigger is supported. Set to false if event based subscription mode is not supported."; } list sampling-interval { description "Time-based triggers are used to define the Sampling intervals. All packets are selected that arrive at the Observation Point within the time intervals defined by the start and stop triggers (i.e., arrival time of the packet is larger than the start time and smaller than the stop time)."; leaf observable-period { type centiseconds; mandatory true; description "Duration of time that should occur between Observation Point for periodic push updates, in units of 0.01 seconds."; } leaf count { type uint16; description "specify the count number of interval that has to pass before successive adaptive periodic push update records for the same subscription are generated for a receiver."; } leaf anchor-time { type yang:date-and-time; description "Designates a timestamp before or after which a series of periodic push updates are determined. The next update will take place at a point in time that is a multiple of a period from the 'anchor-time'. For example, for an 'anchor-time' that is set for the top of a particular minute and a period interval of a minute, updates will be sent at the top of every minute that this subscription is active."; } } leaf counter-threshold-support { type boolean; default "false"; description "Set to true if the subscription mode is event based Wu, et al. Expires January 13, 2021 [Page 10] Internet-Draft Data Export Capability July 2020 subscription mode and counter based trigger is support (i.e., named counter crosses a specified threshold). Set to false if event based subscription mode is not supported."; } leaf suppress-redundant { type boolean; default "false"; description "Suppress dupplicated data objects to be sent during each update interval."; } } } } <CODE ENDS> 4. IANA Considerations 4.1. Updates to the IETF XML Registry This document registers a URI in the "IETF XML Registry" [RFC3688]. Following the format in [RFC3688], the following registration has been made: URI: urn:ietf:params:xml:ns:yang:ietf-data-export-capabilities Registrant Contact: The IESG. XML: N/A; the requested URI is an XML namespace. 4.2. Updates to the YANG Module Names Registry This document registers one YANG module in the "YANG Module Names" registry [RFC6020]. Following the format in [RFC6020], the following registration has been made: name: ietf-data-export-capabilities namespace: urn:ietf:params:xml:ns:yang:ietf-data-export-capabilities prefix: dec reference: RFC XXXX (RFC Ed.: replace XXX with actual RFC number and remove this note.) Wu, et al. Expires January 13, 2021 [Page 11] Internet-Draft Data Export Capability July 2020 5. Security Considerations The YANG module specified in this document defines a schema for data that is designed to be accessed via network management protocols such as NETCONF [RFC6241] or RESTCONF [RFC8040]. The lowest NETCONF layer is the secure transport layer, and the mandatory-to-implement secure transport is Secure Shell (SSH) [RFC6242]. The lowest RESTCONF layer is HTTPS, and the mandatory-to-implement secure transport is TLS [RFC8446]. The NETCONF Configuration Access Control Model (NACM) [RFC8341] provides the means to restrict access for particular NETCONF or RESTCONF users to a preconfigured subset of all available NETCONF or RESTCONF protocol operations and content. There are a number of data nodes defined in this YANG module that are writable/creatable/deletable (i.e., config true, which is the default). These data nodes may be considered sensitive in some network environments. Write operations (e.g., edit-config) to these data nodes without proper protection can have a negative effect on network operations. These are the subtrees and data nodes and their sensitivity/vulnerability: o /sysc:system-capabilities/dec:transport-protocol o /sysc:system-capabilities/dec:encoding-format o /sysc:system-capabilities/dec:secure-transport o /sysc:system-capabilities/dec:compression-mode o /sysc:system-capabilities/dec:max-nodes-per-sensor-group o /sysc:system-capabilities/dec:sensor-group-count o /sysc:system-capabilities/inc:subscription-capabilities/ dec:message-bundling-support o /sysc:system-capabilities/inc:subscription-capabilities/ dec:subscription-mode o /sysc:system-capabilities/sysc:datastore-capabilities/sysc:per- node-capabilities/dec:sampling-interval Wu, et al. Expires January 13, 2021 [Page 12] Internet-Draft Data Export Capability July 2020 6. Contributors The authors would like to thank Ran Tao for his major contributions to the initial modeling and use cases. 7. References 7.1. Normative References [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, March 1997, <https://www.rfc-editor.org/info/rfc2119>. [RFC6241] Enns, R., Ed., Bjorklund, M., Ed., Schoenwaelder, J., Ed., and A. Bierman, Ed., "Network Configuration Protocol (NETCONF)", RFC 6241, DOI 10.17487/RFC6241, June 2011, <https://www.rfc-editor.org/info/rfc6241>. [RFC6242] Wasserman, M., "Using the NETCONF Protocol over Secure Shell (SSH)", RFC 6242, DOI 10.17487/RFC6242, June 2011, <https://www.rfc-editor.org/info/rfc6242>. [RFC7950] Bjorklund, M., Ed., "The YANG 1.1 Data Modeling Language", RFC 7950, DOI 10.17487/RFC7950, August 2016, <https://www.rfc-editor.org/info/rfc7950>. [RFC8040] Bierman, A., Bjorklund, M., and K. Watsen, "RESTCONF Protocol", RFC 8040, DOI 10.17487/RFC8040, January 2017, <https://www.rfc-editor.org/info/rfc8040>. [RFC8126] Cotton, M., Leiba, B., and T. Narten, "Guidelines for Writing an IANA Considerations Section in RFCs", BCP 26, RFC 8126, DOI 10.17487/RFC8126, June 2017, <https://www.rfc-editor.org/info/rfc8126>. [RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174, May 2017, <https://www.rfc-editor.org/info/rfc8174>. [RFC8341] Bierman, A. and M. Bjorklund, "Network Configuration Access Control Model", STD 91, RFC 8341, DOI 10.17487/RFC8341, March 2018, <https://www.rfc-editor.org/info/rfc8341>. Wu, et al. Expires January 13, 2021 [Page 13] Internet-Draft Data Export Capability July 2020 [RFC8342] Bjorklund, M., Schoenwaelder, J., Shafer, P., Watsen, K., and R. Wilton, "Network Management Datastore Architecture (NMDA)", RFC 8342, DOI 10.17487/RFC8342, March 2018, <https://www.rfc-editor.org/info/rfc8342>. [RFC8407] Bierman, A., "Guidelines for Authors and Reviewers of Documents Containing YANG Data Models", BCP 216, RFC 8407, DOI 10.17487/RFC8407, October 2018, <https://www.rfc-editor.org/info/rfc8407>. [RFC8446] Rescorla, E., "The Transport Layer Security (TLS) Protocol Version 1.3", RFC 8446, DOI 10.17487/RFC8446, August 2018, <https://www.rfc-editor.org/info/rfc8446>. 7.2. Informative References [RFC3688] Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688, DOI 10.17487/RFC3688, January 2004, <https://www.rfc-editor.org/info/rfc3688>. [RFC6020] Bjorklund, M., Ed., "YANG - A Data Modeling Language for the Network Configuration Protocol (NETCONF)", RFC 6020, DOI 10.17487/RFC6020, October 2010, <https://www.rfc-editor.org/info/rfc6020>. [RFC8340] Bjorklund, M. and L. Berger, Ed., "YANG Tree Diagrams", BCP 215, RFC 8340, DOI 10.17487/RFC8340, March 2018, <https://www.rfc-editor.org/info/rfc8340>. Appendix A. Usage Example of interaction between telemetry data export capabilities and Adaptive Subscription The following instance-data example describes the notification capabilities of a hypothetical "acme-router". The router implements the running, and operational datastores. Every change can be reported on-change from running, but only config=true nodes and some config=false data from operational. Interface statistics are reported only when both timer-event-support and count-threshold- support are set to true. <CODE BEGINS> file "acme-router-notification-capabilities.xml" ========== NOTE: '\' line wrapping per BCP YYY (RFC YYYY) =========== <?xml version="1.0" encoding="UTF-8"?> <instance-data-set xmlns=\ "urn:ietf:params:xml:ns:yang:ietf-yang-instance-data"> <name>acme-router-notification-capabilities</name> <content-schema> Wu, et al. Expires January 13, 2021 [Page 14] Internet-Draft Data Export Capability July 2020 <module>ietf-system-capabilities@2020-03-23</module> <module>ietf-notification-capabilities@2020-03-23</module> <module>ietf-data-export-capabilities@2020-03-23</module> </content-schema> <!-- revision date, contact, etc. --> <description>Defines the notification capabilities of an acme-router. The router only has running, and operational datastores. Every change can be reported on-change from running, but only config=true nodes and some config=false data from operational. Statistics are not reported based on timer based trigger and counter threshold based trigger. </description> <content-data> <system-capabilities \ xmlns="urn:ietf:params:xml:ns:yang:ietf-system-capabilities" \ xmlns:inc=\ "urn:ietf:params:xml:ns:yang:ietf-notification-capabilities" \ xmlns:ds="urn:ietf:params:xml:ns:yang:ietf-datastores"> <datastore-capabilities> <datastore>ds:operational</datastore> <per-node-capabilities> <node-selector>\ /if:interfaces/if:interface/if:statistics\ </node-selector> <inc:subscription-capabilities> <inc:minimum-dampening-period>5 </inc:minimum-dampening-period> <inc:on-change-supported>\ state-changes\ </inc:on-change-supported> </inc:subscription-capabilities> </per-node-capabilities> <per-node-capabilities> <node-selector>\ /if:interfaces/if:interface/if:statistics/if:out-octets\ </node-selector> <dec:data-export-capabilities> <dec:timer-event-support>true</dec:timer-event-support> <dec:sampling-interval> <dec:period>5</dec:period> <dec:count>6</dec:count> </dec:sampling-interval> <dec:sampling-interval> <dec:period>60</dec:period> <dec:count>6</dec:count> </dec:sampling-interval> <dec:threshold-event-support>false</dec:threshold-event-support> </dec:data-export-capabilities> Wu, et al. Expires January 13, 2021 [Page 15] Internet-Draft Data Export Capability July 2020 </per-node-capabilities> </per-node-capabilities> <per-node-capabilities> <node-selector>\ /if:interfaces/if:interface/if:statistics/if:in-errors\ </node-selector> <dec:data-export-capabilities> <dec:timer-event-support>false</dec:timer-event-support> <dec:threshold-event-support>true</dec:threshold-event-support> </dec:data-export-capabilities> </per-node-capabilities> </datastore-capabilities> </system-capabilities> </content-data> </instance-data-set> The client configure adaptive subscription parameters on the server. The adaptive subscription configuration parameters require the server to scan all interface of specific type every 5 seconds up to 30 seconds if the value of interface in-errors is greater than 1000 ; If the interface in-errors value is less than 1000, switch to 60 seconds period value, and then scan all client every 60 seconds up to 360 seconds. 30 seconds and 360 seconds can be seen as time window. The time window lenght is 6 period values. Irrespective of period value set for adaptive subscription, 6 event records during the time window should be generated for the same subscription and send to the receivers. Wu, et al. Expires January 13, 2021 [Page 16] Internet-Draft Data Export Capability July 2020 <rpc message-id="101" xmlns="urn:ietf:params:xml:ns:netconf:base:1.0"> <edit-config> <target> <running/> </target> <config xmlns:xc="urn:ietf:params:xml:ns:netconf:base:1.0"> <top xmlns="http://example.com/schema/1.2/config"> <yp:datastore xmlns:ds="urn:ietf:params:xml:ns:yang:ietf-datastores"> ds:running </yp:datastore> <yp:datastore-xpath-filter xmlns:ex="https://example.com/sample-data/1.0"> /if:ietf-interfaces </yp:datastore-xpath-filter> <as:adaptive-subscriptions xmlns:as="urn:ietf:params:xml:ns:yang:ietf-adaptive-subscription"> <as:data-path>/if:interfaces/if:interface/if:statistics</as:data-path> <as:target>in-errors</as:target> <as:adaptive-period> <as:condition-expression>in-errors < 1000</as:condition-expressioni> <as:watermark>1000</as:watermark> <as:period>5</as:period> <as:count>12</as:count> </as:adaptive-period> <as:adaptive-period> <as:condition-expression>in-errors < 1000</as:condition-expressioni> <as:watermark>1000</as:watermark> <as:period>60</as:period> <as:count>12</as:count> </as:adaptive-period> </as:adaptive-subscriptions> </top> </config> </edit-config> </rpc> Authors' Addresses Qin Wu Huawei 101 Software Avenue, Yuhua District Nanjing, Jiangsu 210012 China Email: bill.wu@huawei.com Wu, et al. Expires January 13, 2021 [Page 17] Internet-Draft Data Export Capability July 2020 Liang Geng China Mobile 32 Xuanwumen West St, Xicheng District Beijing 10053 Email: gengliang@chinamobile.com Peng Liu China Mobile 32 Xuanwumen West St, Xicheng District Beijing 10053 Email: liupengyjy@chinamobile.com Wu, et al. Expires January 13, 2021 [Page 18]