Service Models Explained
RFC 8309
| Document | Type | RFC - Informational (January 2018; No errata) | |
|---|---|---|---|
| Authors | Qin Wu , Will LIU , Adrian Farrel | ||
| Last updated | 2018-12-19 | ||
| Replaces | draft-wu-opsawg-service-model-explained | ||
| Stream | IETF | ||
| Formats | plain text html pdf htmlized bibtex | ||
| Reviews | |||
| Stream | WG state | Submitted to IESG for Publication | |
| Document shepherd | Tianran Zhou | ||
| Shepherd write-up | Show (last changed 2017-08-31) | ||
| IESG | IESG state | RFC 8309 (Informational) | |
| Action Holders |
(None)
|
||
| Consensus Boilerplate | Yes | ||
| Telechat date | |||
| Responsible AD | Warren Kumari | ||
| Send notices to | Tianran Zhou <zhoutianran@huawei.com> | ||
| IANA | IANA review state | Version Changed - Review Needed | |
| IANA action state | No IANA Actions | ||
Internet Engineering Task Force (IETF) Q. Wu
Request for Comments: 8309 W. Liu
Category: Informational Huawei Technologies
ISSN: 2070-1721 A. Farrel
Juniper Networks
January 2018
Service Models Explained
Abstract
The IETF has produced many modules in the YANG modeling language.
The majority of these modules are used to construct data models to
model devices or monolithic functions.
A small number of YANG modules have been defined to model services
(for example, the Layer 3 Virtual Private Network Service Model
(L3SM) produced by the L3SM working group and documented in RFC
8049).
This document describes service models as used within the IETF and
also shows where a service model might fit into a software-defined
networking architecture. Note that service models do not make any
assumption of how a service is actually engineered and delivered for
a customer; details of how network protocols and devices are
engineered to deliver a service are captured in other modules that
are not exposed through the interface between the customer and the
provider.
Status of This Memo
This document is not an Internet Standards Track specification; it is
published for informational purposes.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Not all documents
approved by the IESG are a candidate for any level of Internet
Standard; see Section 2 of RFC 7841.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
https://www.rfc-editor.org/info/rfc8309.
Wu, et al. Informational [Page 1]
RFC 8309 Service Models Explained January 2018
Copyright Notice
Copyright (c) 2018 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
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terms and Concepts . . . . . . . . . . . . . . . . . . . . . 4
3. Using Service Models . . . . . . . . . . . . . . . . . . . . 7
3.1. Practical Considerations . . . . . . . . . . . . . . . . 8
4. Service Models in an SDN Context . . . . . . . . . . . . . . 8
5. Possible Causes of Confusion . . . . . . . . . . . . . . . . 11
6. Comparison with Other Work . . . . . . . . . . . . . . . . . 13
6.1. Comparison with Network Service Models . . . . . . . . . 13
6.2. Service Delivery and Network Element Model Work . . . . . 15
6.3. Customer Service Model Work . . . . . . . . . . . . . . . 16
6.4. The MEF Architecture . . . . . . . . . . . . . . . . . . 17
7. Further Concepts . . . . . . . . . . . . . . . . . . . . . . 18
7.1. Technology Agnostic . . . . . . . . . . . . . . . . . . . 18
7.2. Relationship to Policy . . . . . . . . . . . . . . . . . 18
7.3. Operator-Specific Features . . . . . . . . . . . . . . . 19
7.4. Supporting Multiple Services . . . . . . . . . . . . . . 19
8. Security Considerations . . . . . . . . . . . . . . . . . . . 20
9. Manageability Considerations . . . . . . . . . . . . . . . . 20
10. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 21
11. References . . . . . . . . . . . . . . . . . . . . . . . . . 21
11.1. Normative References . . . . . . . . . . . . . . . . . . 21
11.2. Informative References . . . . . . . . . . . . . . . . . 21
Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 23
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 23
Wu, et al. Informational [Page 2]
RFC 8309 Service Models Explained January 2018
1. Introduction
In recent years, the number of modules written in the YANG modeling
language [RFC6020] for configuration and monitoring has blossomed.
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