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CDNI Capacity Capability Advertisement Extensions
draft-ietf-cdni-capacity-insights-extensions-04

Document Type Active Internet-Draft (cdni WG)
Authors Andrew Ryan , Ben Rosenblum , Nir Baruch Sopher
Last updated 2024-04-05 (Latest revision 2024-03-04)
Replaces draft-cdni-capacity-insights-extensions, draft-ryan-cdni-capacity-insights-extensions
RFC stream Internet Engineering Task Force (IETF)
Intended RFC status Proposed Standard
Formats
Additional resources Mailing list discussion
Stream WG state WG Consensus: Waiting for Write-Up
Associated WG milestone
Dec 2023
Submit specification of CDNI Extensions for Capacity Capability Advertisement
Document shepherd Sanjay Mishra
IESG IESG state I-D Exists
Consensus boilerplate Yes
Telechat date (None)
Responsible AD (None)
Send notices to sanjay.mishra@verizon.com
draft-ietf-cdni-capacity-insights-extensions-04
Content Delivery Networks Interconnection                        A. Ryan
Internet-Draft                                          Disney Streaming
Intended status: Standards Track                            B. Rosenblum
Expires: 5 September 2024                                         Vecima
                                                               N. Sopher
                                                                   Qwilt
                                                            4 March 2024

           CDNI Capacity Capability Advertisement Extensions
            draft-ietf-cdni-capacity-insights-extensions-04

Abstract

   Open Caching architecture is a use case of Content Delivery Networks
   Interconnection (CDNI) in which the commercial Content Delivery
   Network (CDN) is the upstream CDN (uCDN) and the ISP caching layer
   serves as the downstream CDN (dCDN).  This document supplements to
   the CDNI Capability Objects defined in RFC 8008 the defined
   capability objects structure and interface for advertisements and
   management of a downstream CDN capacity.

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 5 September 2024.

Copyright Notice

   Copyright (c) 2024 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

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   and restrictions with respect to this document.  Code Components
   extracted from this document must include Revised BSD License text as
   described in Section 4.e of the Trust Legal Provisions and are
   provided without warranty as described in the Revised BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
     1.2.  Requirements Language . . . . . . . . . . . . . . . . . .   3
     1.3.  Objectives  . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  CDNI Additional Capability Objects  . . . . . . . . . . . . .   4
     2.1.  Telemetry Capability Object . . . . . . . . . . . . . . .   4
       2.1.1.  Telemetry Source Object . . . . . . . . . . . . . . .   5
         2.1.1.1.  Telemetry Source Types  . . . . . . . . . . . . .   6
         2.1.1.2.  Telemetry Source Metric Object  . . . . . . . . .   7
       2.1.2.  Telemetry Capability Object Serialization . . . . . .   8
     2.2.  CapacityLimits Capability Object  . . . . . . . . . . . .   8
       2.2.1.  Capacity Limit Object . . . . . . . . . . . . . . . .   9
         2.2.1.1.  Capacity Limit Types  . . . . . . . . . . . . . .  10
         2.2.1.2.  Capacity Limit Telemetry Source Object  . . . . .  11
       2.2.2.  Capacity Limit Object Serialization . . . . . . . . .  11
   3.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  12
     3.1.  CDNI Payload Types  . . . . . . . . . . . . . . . . . . .  12
       3.1.1.  CDNI FCI Telemetry Payload Type . . . . . . . . . . .  12
       3.1.2.  CDNI FCI Capacity Limits Payload Type . . . . . . . .  13
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .  13
   5.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  13
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  13
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .  13
     6.2.  Informative References  . . . . . . . . . . . . . . . . .  13
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  14

1.  Introduction

   The Streaming Video Technology Alliance [SVTA] is a global
   association that works to solve streaming video challenges in an
   effort to improve end-user experience and adoption.  The Open Caching
   Working Group [OCWG] of the Streaming Video Technology Alliance
   [SVTA] is focused on the delegation of video delivery requests from
   commercial CDNs to a caching layer at the ISP's network.  Open
   Caching architecture is a specific use case of CDNI where the
   commercial CDN is the upstream CDN (uCDN) and the ISP caching layer
   is the downstream CDN (dCDN).  While delegating traffic from one CDN
   to the other, it is important to make sure that an appropriate amount
   of traffic is delegated.  In order to achieve that, the SVTA Open
   Caching Capacity Insight Specification [OC-CII] defines a feedback
   mechanism to inform the delegator how much traffic is appropriate to

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   delegate.  The traffic level information provided by that interface
   will be consumed by entities, such as the Open Caching Request router
   [OC-RR], to help inform that entity's traffic delegation decisions.
   This information is advisory and does not represent a guarantee,
   commitment, or reservation of capacity.  This document defines and
   registers CDNI Payload Types (as defined at section 7.1 of
   [RFC8006]).  These Payload types are used for Capability Objects
   added to those defined at section 4 of [RFC8008], which are required
   for the Open Caching Capacity Insights Interface [OC-CII].

   For consistency with other CDNI documents this document follows the
   CDNI convention of uCDN (upstream CDN) and dCDN (downstream CDN) to
   represent the commercial CDN and ISP caching layer respectively.

1.1.  Terminology

   The following terms are used throughout this document:

   *  CDN - Content Delivery Network

   Additionally, this document reuses the terminology defined in
   [RFC8008].  Specifically, we use the following CDNI acronyms:

   *  uCDN, dCDN - Upstream CDN and Downstream CDN respectively (see
      [RFC7336] )

1.2.  Requirements Language

   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.

1.3.  Objectives

   In order to enable information exchange between a uCDN and a dCDN
   about acceptable levels of traffic to delegate, the following process
   has been defined:

   In normal operation a uCDN will communicate with a dCDN, via an
   interface, to collect and understand any limits that a dCDN has set
   forth for traffic delegation from a uCDN.  These limits will come in
   the form of metrics such as bits per second, requests per second,
   etc.  These limits can be thought of as Not to Exceed (NTE) limits.

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   The dCDN should provide access to a telemetry source of near real-
   time metrics that the uCDN can use to track current usage.  The uCDN
   should compare its current usage to the limits the dCDN has put forth
   and adjust traffic delegation decisions accordingly to keep current
   usage under the specified limits.

   In summary, the dCDN will provide the uCDN limits on how much traffic
   it should delegate towards the dCDN and then also provide a telemetry
   source that is coupled to the same scope as the limit, so that the
   uCDN can use it to track its current usage against the advertised
   limit.  Having a limit and a corresponding telemetry source for that
   limit allows for an unambiguous definition of what a particular limit
   means for both the uCDN and dCDN.

   Limits that are communicated from the dCDN to the uCDN should be
   considered valid based on the TTL (Time To Live) provided by a
   mechanism of the underlying transport, e.g., an HTTP Cache-Control
   header.  The intention is that the limits would have a long lived TTL
   and would represent a reasonable peak utilization limit that the uCDN
   should target.

2.  CDNI Additional Capability Objects

   Section 5 of [RFC8008] describes the FCI Capability Advertisement
   Object, which contains a CDNI Capability Object as well as the
   capability object type (a CDNI Payload Type).  The section also
   defines the Capability Objects per such type.  Below, we define two
   additional Capability Objects.

   Note: In the following sections, the term "mandatory-to-specify" is
   used to convey which properties MUST be included when serializing a
   given capability object.  When mandatory-to-specify is defined as
   "Yes" for an individual property, it means that if the object
   containing that property is included in an FCI message, then the
   mandatory-to-specify property MUST be included.

2.1.  Telemetry Capability Object

   The Telemetry Capability Object is used to define a list of telemetry
   sources made available by the dCDN to the uCDN.  In this document,
   Telemetry data is being defined as near real-time aggregated metrics
   of dCDN utilization, such as bits per second egress, and should be
   specific to the uCDN and dCDN traffic delegation relationship.
   Telemetry data is uniquely defined by a source id, a metric name,
   along with the footprints that are associated with an FCI.Capability
   advertisement.  When defining a Capacity Limit, the meaning of a
   limit might be considered ambiguous if the uCDN and dCDN are defining
   current usage via different data sources.  Having the dCDN provide a

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   data source defining usage that both itself and the uCDN reference
   makes this a non-ambiguous metric for use when determining current
   usage and how that compares to a limit.  Telemetry data is not only
   an important component for making informed traffic delegation
   decisions but also for providing visibility to traffic that has been
   delegated back through to upstream providers.  In situations where
   there are multiple CDN delegations, a uCDN will need to incorporate
   the usage information from any dCDNs to which it delegated when it is
   asked to provide usage information otherwise, the traffic may seem
   unaccounted for.  An example of this situation is when a Content
   Provider delegates traffic directly to a CDN, and that CDN decides to
   further delegate that traffic to a dCDN, when the Content Provider
   polls the uCDN for traffic usage, if the uCDN does not integrate the
   Telemetry data of the dCDN to which it delegated, any of the traffic
   the uCDN delegated to its dCDN would become invisible to the Content
   Provider.

      Property: sources

         Description: Telemetry sources made available to the uCDN.

         Type: A JSON array of Telemetry Source objects (see
         Section 2.1.1).

         Mandatory-to-Specify: Yes.

2.1.1.  Telemetry Source Object

   The Telemetry Source Object is built of an associated type, a list of
   exposed metrics, and type-specific configuration data.

      Property: id

         Description: An identifier of a telemetry source.  The ID
         string assigned to this Telemetry Source MUST be unique across
         all Telemetry Source objects in the advertisement.  The ID
         string SHOULD remain consistent for the same source reference
         across advertisements.

         Type: String.

         Mandatory-to-Specify: Yes.

      Property: type

         Description: A valid telemetry source type.  See
         Section 2.1.1.1.

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         Type: String.

         Mandatory-to-Specify: Yes.

      Property: metrics

         Description: The metrics exposed by this source.

         Type: A JSON array of Telemetry Source Metric objects (see
         Section 2.1.1.2).

         Mandatory-to-Specify: Yes.

      Property: configuration

         Description: a source-specific representation of the Telemetry
         source configuration.  For the generic source type, this
         configuration format is defined out-of-band.  For other types,
         the configuration format will be specified in a yet to be
         defined Telemetry Interface specification.  The goal of this
         element is to allow for forward compatibility with a formal
         Telemetry interface.

         Type: A JSON object, the structure of which is specific to the
         Telemetry source and outside the scope of this document.

         Mandatory-to-Specify: No.

2.1.1.1.  Telemetry Source Types

   At the time of this draft, the registry of valid Telemetry Source
   Object types is limited to a single type: Generic.  The intention of
   this type registry is to allow for future extension to reference a
   yet to be drafted specification for a CDNI Telemetry interface, which
   would standardize the definition and format of Telemetry data between
   participants of a CDNI workflow.

          +=============+======================================+
          | Source Type | Description                          |
          +=============+======================================+
          | generic     | An object which allows for           |
          |             | advertisement of generic datasources |
          +-------------+--------------------------------------+

                                 Table 1

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2.1.1.2.  Telemetry Source Metric Object

   The Telemetry Source Metric Object describes the metric to be
   exposed.

      Property: name

         Description: An identifier for this metric.  This ID string
         MUST be unique among metric objects within the containing
         Telemetry Source.  The ID string SHOULD remain consistent for
         the same source reference across advertisements.

         Type: String.

         Mandatory-to-Specify: Yes.

      Property: time-granularity

         Description: Represents the time frame that the data represents
         in seconds.  e.g., is this a data set over 300 seconds (i.e., 5
         minutes), 3600 seconds (i.e., one hour), etc.

         Type: Integer.

         Mandatory-to-Specify: No.

      Property: data-percentile

         Description: The percentile calculation the data represents,
         i.e., 50 percentile would equate to the median over the time-
         granularity.  Lack of a data-percentile will mean that the data
         is the average over the time representation.

         Type: Integer.

         Mandatory-to-Specify: No.

      Property: latency

         Description: Time in seconds that the data is behind real time.
         This is important to specify to help the uCDN to understand how
         long it might take to reflect traffic adjustments in the
         metrics.

         Type: Integer.

         Mandatory-to-Specify: No.

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2.1.2.  Telemetry Capability Object Serialization

   The following shows an example of Telemetry Capability including 2
   metrics for a source, that is scoped to a footprint.

   "capabilities": [
     {
       "capability-type": "FCI.Telemetry",
       "capability-value": {
         "sources": [
           {
             "id": "capacity_metrics_region1",
             "type": "generic",
             "metrics": [
               {
                 "name": "egress_5m",
                 "time-granularity": 300,
                 "data-percentile": 50,
                 "latency": 1500
               },
               {
                 "name": "requests_5m",
                  ...
               }
             ]
           }
         ]
       },
       "footprints": [
         <footprint objects>
       ]
     }
   ]

2.2.  CapacityLimits Capability Object

   The Capacity Limits Capability Object enables the dCDN to specify
   traffic delegation limits to a uCDN within an FCI.Capabilities
   advertisement.  The limits specified by the dCDN will inform the uCDN
   on how much traffic can be delegated to the dCDN.  The limits
   specified by the dCDN should be considered Not To Exceed (NTE)
   limits.  The limits should be based on near real time telemetry data
   that the dCDN provides to the uCDN, or in other words, for each limit
   that is advertised, there should also exist a telemetry source which
   provides data of current utilization against the particular
   advertised limit.

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      Property: limits

         Description: A collection of Capacity Limit objects.

         Type: A JSON array of CapacityLimit objects (see
         Section 2.2.1).

         Mandatory-to-Specify: Yes.

2.2.1.  Capacity Limit Object

   A CapacityLimit object is used to represent traffic limits for
   delegation from the uCDN towards the dCDN.  The limit object is
   scoped to the footprint associated with the FCI capability
   advertisement encompassing this object.  Limits will be considered
   using a logical AND, such that a uCDN will need to ensure that all
   the limits are considered and honored rather than choosing the most
   specific only.

      Property: limit-type

         Description: The units of maximum-hard and maximum-soft.

         Type: String.  One of the values listed in Section 2.2.1.1.

         Mandatory-to-Specify: Yes.

      Property: id

         Description: Specifies an identifier associated with a limit.
         This MAY be used as a relational identifier to a specific
         Capacity Limit Object.  If specified, this identifier MUST be
         unique among specified identifiers associated with any other
         CapacityLimit objects in the advertisement.

         Type: String.

         Mandatory-to-Specify: No.

      Property: maximum-hard

         Description: The maximum unit of capacity that is available for
         use.

         Type: Integer.

         Mandatory-to-Specify: Yes.

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      Property: maximum-soft

         Description: A soft limit at which an upstream should consider
         reducing traffic to prevent hitting the hard limit.  This value
         SHOULD be less than the value of maximum-hard.  If this value
         is not specified, it is equal to the value of maximum-hard.

         Type: Integer.

         Mandatory-to-Specify: No.

      Property: current

         Description: Specifies the current usage value of the limit.
         It is NOT RECOMMENDED to specify the current usage value inline
         with the FCI.CapacityLimits advertisements as it will reduce
         the ability to cache the response, but this mechanism exists
         for simple use cases where an external telemetry source cannot
         be feasibly implemented.  The intended method for providing
         telemetry data is to reference a Telemetry Source object
         Section 2.2.1.2 to poll for the current usage.

         Type: Integer.

         Mandatory-to-Specify: No.

      Property: telemetry-source

         Description: Mapping of each particular limit to a specific
         metric with relevant real-time data provided by a telemetry
         source.

         Type: Capacity Limit Telemetry Source object (see
         Section 2.2.1.2).

         Mandatory-to-Specify: No.

2.2.1.1.  Capacity Limit Types

   Below are listed the valid capacity limit types.  Additional limits
   would need to be specified and extended into this list.  The values
   specified here represent the types that were identified as being the
   most relevant metrics for the purposes of traffic delegation between
   CDNs.

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                 +=================+=====================+
                 | Limit Type      | Units               |
                 +=================+=====================+
                 | egress          | Bits per second     |
                 +-----------------+---------------------+
                 | requests        | Requests per second |
                 +-----------------+---------------------+
                 | storage-size    | Total bytes         |
                 +-----------------+---------------------+
                 | storage-objects | Count               |
                 +-----------------+---------------------+
                 | sessions        | Count               |
                 +-----------------+---------------------+
                 | cache-size      | Total bytes         |
                 +-----------------+---------------------+

                                  Table 2

2.2.1.2.  Capacity Limit Telemetry Source Object

   The Capacity Limit Telemetry Source Object refers to a specific
   metric within a Telemetry Source.

      Property: id

         Description: Reference to the "id" of a telemetry source
         defined by a Telemetry Capability object as defined in
         Section 2.1.

         Type: String.

         Mandatory-to-Specify: Yes.

      Property: metric

         Description: Reference to the "name" property of a metric
         defined within a telemetry source of an Telemetry Capability
         object.

         Type: String.

         Mandatory-to-Specify: Yes.

2.2.2.  Capacity Limit Object Serialization

   The following shows an example of an FCI.CapacityLimits object.

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   "capabilities":[
     {
       "capability-type":"FCI.CapacityLimits",
       "capability-value":{
         "limits":[
           {
             "id":"capacity_limit_region1",
             "limit-type":"egress",
             "maximum-hard":50000000000,
             "maximum-soft":25000000000,
             "telemetry-source":{
               "id":"capacity_metrics_region1",
               "metric":"egress_5m"
             }
           }
         ]
       },
       "footprints":[
         "<footprint objects>"
       ]
     }
   ]

3.  IANA Considerations

3.1.  CDNI Payload Types

   This document requests the registration of the two additional payload
   types:

                  +====================+===============+
                  | Payload Type       | Specification |
                  +====================+===============+
                  | FCI.Telemetry      | RFCthis       |
                  +--------------------+---------------+
                  | FCI.CapacityLimits | RFCthis       |
                  +--------------------+---------------+

                                 Table 3

   [RFC Editor: Please replace RFCthis with the published RFC number for
   this document.]

3.1.1.  CDNI FCI Telemetry Payload Type

      Purpose: The purpose of this Payload Type is to list the supported
      telemetry sources and the metrics made available by each source.

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      Interface: FCI.

      Encoding: See section Section 2.1.

3.1.2.  CDNI FCI Capacity Limits Payload Type

      Purpose: The purpose of this Payload Type is to define Capacity
      Limits based on a utilization metrics corresponding to telemetry
      sources provided by the dCDN.

      Interface: FCI.

      Encoding: See section Section 2.2.

4.  Security Considerations

   This specification is in accordance with the CDNI Request Routing:
   Footprint and Capabilities Semantics.  As such, it is subject to the
   security and privacy considerations as defined in Section 7 of
   [RFC8008].

5.  Acknowledgements

   The authors would like to express their gratitude to the members of
   the Streaming Video Technology Alliance [SVTA] Open Caching Working
   Group for their guidance, contribution, and review.

6.  References

6.1.  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>.

   [RFC8008]  Seedorf, J., Peterson, J., Previdi, S., van Brandenburg,
              R., and K. Ma, "Content Delivery Network Interconnection
              (CDNI) Request Routing: Footprint and Capabilities
              Semantics", RFC 8008, DOI 10.17487/RFC8008, December 2016,
              <https://www.rfc-editor.org/info/rfc8008>.

   [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>.

6.2.  Informative References

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   [OC-CII]   Ryan, A., Ed., Rosenblum, B., Goldstein, G., Roskin, R.,
              and G. Bichot, "Open Caching Capacity Insights -
              Functional Specification (Placeholder before
              publication)", <https://www.svta.org/document/open-
              caching-capacity-interface/>.

   [OC-RR]    Finkelman, O., Ed., Hofmann, J., Klein, E., Mishra, S.,
              Ma, K., Sahar, D., and B. Zurat, "Open Caching Request
              Routing - Functional Specification", Version 1.1, 4
              October 2019, <https://www.svta.org/product/open-cache-
              request-routing-functional-specification/>.

   [OCWG]     "Open Caching Home Page", <https://opencaching.svta.org/>.

   [RFC6707]  Niven-Jenkins, B., Le Faucheur, F., and N. Bitar, "Content
              Distribution Network Interconnection (CDNI) Problem
              Statement", RFC 6707, DOI 10.17487/RFC6707, September
              2012, <https://www.rfc-editor.org/info/rfc6707>.

   [RFC7336]  Peterson, L., Davie, B., and R. van Brandenburg, Ed.,
              "Framework for Content Distribution Network
              Interconnection (CDNI)", RFC 7336, DOI 10.17487/RFC7336,
              August 2014, <https://www.rfc-editor.org/info/rfc7336>.

   [RFC8006]  Niven-Jenkins, B., Murray, R., Caulfield, M., and K. Ma,
              "Content Delivery Network Interconnection (CDNI)
              Metadata", RFC 8006, DOI 10.17487/RFC8006, December 2016,
              <https://www.rfc-editor.org/info/rfc8006>.

   [RFC8007]  Murray, R. and B. Niven-Jenkins, "Content Delivery Network
              Interconnection (CDNI) Control Interface / Triggers",
              RFC 8007, DOI 10.17487/RFC8007, December 2016,
              <https://www.rfc-editor.org/info/rfc8007>.

   [RFC8804]  Finkelman, O. and S. Mishra, "Content Delivery Network
              Interconnection (CDNI) Request Routing Extensions",
              RFC 8804, DOI 10.17487/RFC8804, September 2020,
              <https://www.rfc-editor.org/info/rfc8804>.

   [SVTA]     "Streaming Video Technology Alliance Home Page",
              <https://www.svta.org>.

Authors' Addresses

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   Andrew Ryan
   Disney Streaming
   1211 Avenue of the Americas
   New York
               , NY 10036
   United States of America
   Email: andrew@andrewnryan.com

   Ben Rosenblum
   Vecima
   4375 River Green Pkwy #100
   Duluth
               , GA 30096
   United States of America
   Email: ben@rosenblum.dev

   Nir B. Sopher
   Qwilt
   6, Ha'harash
   Hod HaSharon
                4524079
   Israel
   Email: nir@apache.org

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