Operating the Network Service Header (NSH) with Next Protocol "None"
RFC 8393
Document | Type | RFC - Proposed Standard (May 2018; No errata) | |
---|---|---|---|
Authors | Adrian Farrel , John Drake | ||
Last updated | 2018-12-19 | ||
Stream | IETF | ||
Formats | plain text html pdf htmlized bibtex | ||
Reviews | |||
Stream | WG state | Submitted to IESG for Publication | |
Document shepherd | Tal Mizrahi | ||
Shepherd write-up | Show (last changed 2018-01-08) | ||
IESG | IESG state | RFC 8393 (Proposed Standard) | |
Action Holders |
(None)
|
||
Consensus Boilerplate | Yes | ||
Telechat date | |||
Responsible AD | Alia Atlas | ||
Send notices to | Tal Mizrahi <tal.mizrahi.phd@gmail.com> | ||
IANA | IANA review state | Version Changed - Review Needed | |
IANA action state | RFC-Ed-Ack |
Internet Engineering Task Force (IETF) A. Farrel Request for Comments: 8393 J. Drake Category: Standards Track Juniper Networks ISSN: 2070-1721 May 2018 Operating the Network Service Header (NSH) with Next Protocol "None" Abstract This document describes a network that supports Service Function Chaining (SFC) using the Network Service Header (NSH) with no payload data and carrying only metadata. This is achieved by defining a new NSH "Next Protocol" type value of "None". This document illustrates some of the functions that may be achieved or enhanced by this mechanism, but it does not provide an exhaustive list of use cases, nor is it intended to be definitive about the functions it describes. It is expected that other documents will describe specific use cases in more detail and will define the protocol mechanics for each use case. Status of This Memo This is an Internet Standards Track document. 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). Further information on Internet Standards is available in 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/rfc8393. Farrel & Drake Standards Track [Page 1] RFC 8393 NSH with No Data May 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. Requirements Language . . . . . . . . . . . . . . . . . . . . 4 3. The Network Service Header . . . . . . . . . . . . . . . . . 4 3.1. Next Protocol "None" . . . . . . . . . . . . . . . . . . 4 4. Processing Rules . . . . . . . . . . . . . . . . . . . . . . 4 5. Backward Compatibility . . . . . . . . . . . . . . . . . . . 5 6. Overview of Use Cases . . . . . . . . . . . . . . . . . . . . 6 6.1. Per-SFP Metadata . . . . . . . . . . . . . . . . . . . . 6 6.2. Per-Flow Metadata . . . . . . . . . . . . . . . . . . . . 7 6.3. Coordination between SFC-Aware SFIs . . . . . . . . . . . 7 6.4. Operations, Administration, and Maintenance (OAM) . . . . 8 6.5. Control-Plane and Management-Plane Uses . . . . . . . . . 8 6.6. Non-applicable Use Cases . . . . . . . . . . . . . . . . 9 7. Management and Congestion Control Considerations . . . . . . 9 8. Security Considerations . . . . . . . . . . . . . . . . . . . 10 9. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 11 10. References . . . . . . . . . . . . . . . . . . . . . . . . . 11 10.1. Normative References . . . . . . . . . . . . . . . . . . 11 10.2. Informative References . . . . . . . . . . . . . . . . . 11 Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 12 Contributors . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 12 Farrel & Drake Standards Track [Page 2] RFC 8393 NSH with No Data May 2018 1. Introduction An architecture for Service Function Chaining (SFC) is presented in [RFC7665]. That architecture enables packets to be forwarded along Service Function Paths (SFPs) to pass through various Service Functions (SFs) that act on the packets. Each packet is encapsulated with a Network Service Header (NSH) [RFC8300] that identifies the SFP that the packet travels along (by means of a Service Path Identifier -- SPI) and the hop (i.e., the next SF to be executed) along the SFP that the packet has reached (by means of a Service Index -- SI). The SPI and SI are fields encoded in the NSH. Packets are classified at the SFC network ingress boundaries by classifiers (Section 4.4 of [RFC7665]) and have an NSH applied toShow full document text