MPLS Transport Encapsulation For The SFC NSH
draft-ietf-mpls-sfc-encapsulation-04

Document Type Active Internet-Draft (mpls WG)
Last updated 2019-03-25 (latest revision 2019-03-24)
Replaces draft-malis-mpls-sfc-encapsulation
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MPLS Working Group                                              A. Malis
Internet-Draft                                                 S. Bryant
Intended status: Informational                       Huawei Technologies
Expires: September 22, 2019                                   J. Halpern
                                                                Ericsson
                                                           W. Henderickx
                                                                   Nokia
                                                          March 21, 2019

              MPLS Transport Encapsulation For The SFC NSH
                  draft-ietf-mpls-sfc-encapsulation-04

Abstract

   This document describes how to use a Service Function Forwarder (SFF)
   Label (similar to a pseudowire label or VPN label) to indicate the
   presence of a Service Function Chaining (SFC) Network Service Header
   (NSH) between an MPLS label stack and the packet original packet/
   frame.  This allows SFC packets using the NSH to be forwarded between
   SFFs over an MPLS network, and to select one of multiple SFFs in the
   destination MPLS node.

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 September 22, 2019.

Copyright Notice

   Copyright (c) 2019 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

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   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  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  MPLS Encapsulation Using an SFF Label . . . . . . . . . . . .   3
     2.1.  MPLS Label Stack Construction at the Sending Node . . . .   4
     2.2.  SFF Label Processing at the Destination Node  . . . . . .   5
   3.  Equal Cost Multipath (ECMP) Considerations  . . . . . . . . .   5
   4.  Operations, Administration, and Maintenance (OAM)
       Considerations  . . . . . . . . . . . . . . . . . . . . . . .   6
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   6
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   6
     8.2.  Informative References  . . . . . . . . . . . . . . . . .   7
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   8

1.  Introduction

   As discussed in [RFC8300], a number of transport encapsulations for
   the Service Function Chaining (SFC) Network Service Header (NSH)
   already exist, such as Ethernet, UDP, GRE, and others.

   This document describes an MPLS transport encapsulation for the NSH
   and how to use a Service Function Forwarder (SFF) [RFC7665] Label to
   indicate the presence of the NSH in the MPLS packet payload.  This
   allows SFC packets using the NSH to be forwarded between SFFs in an
   MPLS transport network, where MPLS is used to interconnect the
   network nodes that contain one or more SFFs.  The label is also used
   to select between multiple SFFs in the destination MPLS node.

   This encapsulation is equivalent from an SFC perspective to other
   transport encapsulations of packets using the NSH.  This can be
   illustrated by adding an additional line to the example of a next-hop
   SPI/SI-to-network overlay network locator mapping in Table 1 of
   [RFC8300]:

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