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Дата изменения: Thu Oct 8 10:01:49 2015
Дата индексирования: Sun Apr 10 08:07:48 2016
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Поисковые слова: vallis

Service Function Chaining W. Meng
Internet-Draft C. Wang
Intended status: Standards Track ZTE Corporation
Expires: April 9, 2016 October 7, 2015

NSH Context Header - Broadband
draft-meng-sfc-nsh-broadband-allocation-00

Abstract

This document provides a recommended allocation of the mandatory
fixed context headers for a Network Service Header (NSH) within the
broadband service provider network context.

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 http://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 April 9, 2016.

Copyright Notice

Copyright (c) 2015 IETF Trust and the persons identified as the
document authors. All rights reserved.

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Table of Contents

1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Convention and Terminology . . . . . . . . . . . . . . . . . . 4
3. Network Service Header (NSH) Context Headers . . . . . . . . . 5
4. Recommended Broadband Context Allocation . . . . . . . . . . . 6
5. Broadband Allocation Specifics . . . . . . . . . . . . . . . . 7
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 8
7. Normative References . . . . . . . . . . . . . . . . . . . . . 9
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 10

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1. Introduction

The objective of SFC is trying to unload services from nodes in
traditional network and deal with such services through service
function chains.

As increasingly large number of customers, The possibility of
deployment SFC in broadband network seems emergency. And this
document is aimed to provides a recommended allocation of the
mandatory fixed context headers for a Network Service Header (NSH) in
broadband network.

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2. Convention and Terminology

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [RFC2119].

The terms about SFC are defined in [I-D.ietf-sfc-problem-statement].

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3. Network Service Header (NSH) Context Headers

In Service Function Chaining, the Network Service Header is composed
of a 4-byte base header (BH1), a 4-byte service path header (SH1) and
four mandatory 4-byte context headers (CH1-CH4).

0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|Ver|O|C|R|R|R|R|R|R| Length | MD Type = 0x01| Next Protocol | BH1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Service Path ID | Service Index | SH1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Mandatory Context Header 1 | CH1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Mandatory Context Header 2 | CH2
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Mandatory Context Header 3 | CH3
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Mandatory Context Header 4 | CH4
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Figure 1: Network Service Header - MD Type 0x01

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4. Recommended Broadband Context Allocation

The following context header allocation provides information to
support service function chaining in a broadband service provider
network.

0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Source Node ID | Source Interface ID |CH1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| User ID/Accouting ID | CH2
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| vlan ID | reserved | CH3
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| reserved | CH4
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Figure 2: NSH Broadband Context Allocation

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5. Broadband Allocation Specifics

Source Node ID: An identifier indicating the source device where the
original traffic initially entered the Service Function Chain. This
identifier is unique within an SFC-enabled domain.

Source Interface ID: An identifier indicating the source interface
where the original traffic initially entered the Service Function
Chain. This identifier is scoped within the context of the Source
Node ID.

User ID: The user ID indicates the user who access to the broadband
network. It is unique in administrative domain.

Vlan ID : Together with Source Node ID and Source Interface ID, they
indicate the access point of the user accessing.

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6. IANA Considerations

This memo includes no request to IANA.

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7. Normative References

[I-D.ietf-sfc-nsh]
Quinn, P. and U. Elzur, "Network Service Header",
draft-ietf-sfc-nsh-01 (work in progress), July 2015.

[I-D.ietf-sfc-problem-statement]
Quinn, P. and T. Nadeau, "Service Function Chaining
Problem Statement", draft-ietf-sfc-problem-statement-13
(work in progress), February 2015.

[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/
RFC2119, March 1997,
.

[RFC2865] Rigney, C., Willens, S., Rubens, A., and W. Simpson,
"Remote Authentication Dial In User Service (RADIUS)",
RFC 2865, DOI 10.17487/RFC2865, June 2000,
.

[RFC7498] Quinn, P., Ed. and T. Nadeau, Ed., "Problem Statement for
Service Function Chaining", RFC 7498, DOI 10.17487/
RFC7498, April 2015,
.

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Authors' Addresses

Wei Meng
ZTE Corporation
No.50 Software Avenue, Yuhuatai District
Nanjing
China

Email: meng.wei2@zte.com.cn,vally.meng@gmail.com

Cui Wang
ZTE Corporation
No.50 Software Avenue, Yuhuatai District
Nanjing
China

Email: wang.cui1@zte.com.cn

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