Advertising Service Functions Using OSPF
draft-xu-ospf-service-function-adv-00

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Last updated 2014-05-28
Replaces draft-xu-ospf-service-sid-adv
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Network Working Group                                              X. Xu
Internet-Draft                                                    Huawei
Intended status: Standards Track                            May 29, 2014
Expires: November 30, 2014

                Advertising Service Functions Using OSPF
                 draft-xu-ospf-service-function-adv-00

Abstract

   The Segment Routing mechanism can be leveraged to realize the service
   path layer functionality of the Service Function Chaining (i.e,
   steering traffic through the service function path).  This document
   describes how to advertise service functions and their corresponding
   segment IDs using OSPF.  Here the OSPF means both OSPFv2 and OSPFv3.

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
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   This Internet-Draft will expire on November 30, 2014.

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   document authors.  All rights reserved.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   2
   3.  Advertising Service Functions and Corresponding SIDs  . . . .   2
     3.1.  Service Function TLV  . . . . . . . . . . . . . . . . . .   3
     3.2.  Service Function SID Sub-TLV  . . . . . . . . . . . . . .   3
   4.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   4
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   4
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .   4
     7.2.  Informative References  . . . . . . . . . . . . . . . . .   4
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   5

1.  Introduction

   [I-D.xu-spring-sfc-use-case] describes a particular use case for
   SPRING where the Segment Routing (SR) mechanism is leveraged to
   realize the service path layer functionality of the Service Function
   Chaining (SFC), i.e, steering traffic through the service function
   path.  To allow the service classifier to encode the segment list
   represeting a particular service function path, the classifier needs
   to know on which service node(s) a given service function is located
   and what segment ID (SID) is used to indicate that service function
   on a given service node.  This document describes how to advertise
   service functions and their corresponding SIDs using OSPF.  Here the
   OSPF means both OSPFv2 [RFC2328] and OSPFv3 [RFC2740].

1.1.  Requirements Language

   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 RFC 2119 [RFC2119].

2.  Terminology

   This memo makes use of the terms defined in [RFC4970].

3.  Advertising Service Functions and Corresponding SIDs

   Service nodes within the network need to advertise each service
   function they are offering by using a TLV within the body of the OSPF
   Router Information (RI) Opaque LSA [RFC4970].  This new TLV is called
   as Service Function TLV.  The Service Function TLV is applicable to
   both OSPFv2 and OSPFv3.  The Service Function TLV could appear
   multiple times wihin a given Router Information (RI) Opaque LSA when

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