Service Function Chaining: Subscriber and Performance Policy Identification Variable-Length Network Service Header (NSH) Context Headers
draft-ietf-sfc-serviceid-header-06
SFC B. Sarikaya
Internet-Draft Denpel Informatique
Intended status: Standards Track D. von Hugo
Expires: July 16, 2020 Deutsche Telekom
M. Boucadair
Orange
January 13, 2020
Service Function Chaining: Subscriber and Performance Policy
Identification Variable-Length Network Service Header (NSH) Context
Headers
draft-ietf-sfc-serviceid-header-06
Abstract
This document defines Subscriber and Performance Policy Identifiers
Network Service Header Variable-Length Context Headers to inform
Service Functions about subscriber- and service-related information
for the sake of policy enforcement and appropriate service function
chaining operations. The structure of each context header is
defined, their use and processing instructions by SFC-aware nodes are
explained.
Status of This Memo
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This Internet-Draft will expire on July 16, 2020.
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document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Conventions and Terminology . . . . . . . . . . . . . . . . . 4
3. Subscriber Identification NSH Variable-Length Context Header 4
4. Performance Policy Identification NSH Variable-Length Context
Headers . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 7
6. Security Considerations . . . . . . . . . . . . . . . . . . . 8
7. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 8
8. References . . . . . . . . . . . . . . . . . . . . . . . . . 8
8.1. Normative References . . . . . . . . . . . . . . . . . . 8
8.2. Informative References . . . . . . . . . . . . . . . . . 9
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 9
1. Introduction
This document discusses how to inform Service Functions (SFs,
[RFC7665]) about subscriber- and service-related information, when
required, for the sake of policy enforcement within a single
administrative domain. Particularly, subscriber-related information
may be required to enforce subscriber-specific SFC-based traffic
policies. Nevertheless, the information carried in packets may not
be sufficient to unambiguously identify a subscriber. This document
fills this void by specifying a new Network Service Header (NSH)
[RFC8300] context header to convey and disseminate such information
within the boundaries of a single administrative domain.
Also, the enforcement of SFC-based differentiated traffic policies
may be inferred, for example, by QoS (Quality of Service)
considerations. Typically, QoS information may serve as an input to
the Service Function Path (SFP) for path computation, establishment,
and selection. Furthermore, the dynamic structuring of service
function chains and their subsequent enforcement may be conditioned
by QoS requirements that will affect SF instance identification,
location, and sequencing. Hence, the need to supply a performance
policy identifier to upstream SFs to appropriately meet the service
requirements arises.
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