A Framework for Constructing Service Function Chaining Systems Based on Segment Routing
draft-li-spring-sr-sfc-control-plane-framework-02
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SPRING Working Group C. Li
Internet-Draft Huawei Technologies
Intended status: Informational A. Sawaf
Expires: November 9, 2020 Saudi Telecom Company
R. Hu
Z. Li
Huawei Technologies
May 8, 2020
A Framework for Constructing Service Function Chaining Systems Based on
Segment Routing
draft-li-spring-sr-sfc-control-plane-framework-02
Abstract
Segment Routing (SR) allows for a flexible definition of end-to-end
paths by encoding paths as sequences of topological sub-paths, called
"segments". Segment routing architecture can be implemented over an
MPLS data plane as well as an IPv6 data plane.
Service Function Chaining (SFC) provides support for the creation of
composite services that consist of an ordered set of Service
Functions (SF) that are to be applied to packets and/or frames
selected as a result of classification.
SFC can be implemented based on several technologies, such as Network
Service Header (NSH) and SR. This document describes a framework for
constructing SFC based on Segment Routing. The document reviews the
control plane solutions for route distribution of service function
instance and service function path, and steering packets into a
service function chain.
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."
Li, et al. Expires November 9, 2020 [Page 1]
Internet-Draft SR based SFC Control Plane May 2020
This Internet-Draft will expire on November 9, 2020.
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
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Requirements Language . . . . . . . . . . . . . . . . . . 3
1.2. Terminology . . . . . . . . . . . . . . . . . . . . . . . 3
2. Overview of SR Based SFC Control Plane . . . . . . . . . . . 4
3. Stateless SR Based SFC . . . . . . . . . . . . . . . . . . . 6
3.1. Service Function Instance Route Distribution . . . . . . 6
3.2. Service Function Path Route Distribution . . . . . . . . 7
3.3. Steer Packets into SFC . . . . . . . . . . . . . . . . . 7
4. Stateful SR Based SFC . . . . . . . . . . . . . . . . . . . . 8
4.1. Service Function Route Distribution . . . . . . . . . . . 8
4.2. Service Function Path Route Distribution . . . . . . . . 8
4.3. Steer Packets into SFC . . . . . . . . . . . . . . . . . 8
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 9
6. Security Considerations . . . . . . . . . . . . . . . . . . . 9
7. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 9
8. References . . . . . . . . . . . . . . . . . . . . . . . . . 9
8.1. Normative References . . . . . . . . . . . . . . . . . . 9
8.2. Informative References . . . . . . . . . . . . . . . . . 9
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 12
1. Introduction
Segment routing (SR) [RFC8402] is a source routing paradigm that
explicitly indicates the forwarding path for packets at the ingress
node by inserting an ordered list of instructions, called segments.
When segment routing is deployed on MPLS data plane, it is called SR-
MPLS [I-D.ietf-spring-segment-routing-mpls]. When segment routing is
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