Forwarding and Control Element Separation (ForCES) Inter-FE Logical Functional Block (LFB)
RFC 8013

Document Type RFC - Proposed Standard (February 2017; No errata)
Was draft-ietf-forces-interfelfb (individual in rtg area)
Last updated 2017-02-22
Replaces draft-joachimpillai-forces-interfelfb
Stream IETF
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Stream WG state WG Document
Document shepherd Evangelos Haleplidis
Shepherd write-up Show (last changed 2016-06-22)
IESG IESG state RFC 8013 (Proposed Standard)
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Responsible AD Alia Atlas
IESG note Draft to finish after forces WG has closed.
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IANA IANA review state Version Changed - Review Needed
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Internet Engineering Task Force (IETF)                  D. Joachimpillai
Request for Comments: 8013                                       Verizon
Category: Standards Track                                  J. Hadi Salim
ISSN: 2070-1721                                        Mojatatu Networks
                                                           February 2017

           Forwarding and Control Element Separation (ForCES)
                Inter-FE Logical Functional Block (LFB)

Abstract

   This document describes how to extend the Forwarding and Control
   Element Separation (ForCES) Logical Functional Block (LFB) topology
   across Forwarding Elements (FEs) by defining the inter-FE LFB class.
   The inter-FE LFB class provides the ability to pass data and metadata
   across FEs without needing any changes to the ForCES specification.
   The document focuses on Ethernet transport.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc8013.

Copyright Notice

   Copyright (c) 2017 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
   (http://trustee.ietf.org/license-info) in effect on the date of
   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.

Joachimpillai & Hadi Salim   Standards Track                    [Page 1]
RFC 8013                   ForCES Inter-FE LFB             February 2017

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology and Conventions . . . . . . . . . . . . . . . . .   3
     2.1.  Requirements Language . . . . . . . . . . . . . . . . . .   3
     2.2.  Definitions . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Problem Scope and Use Cases . . . . . . . . . . . . . . . . .   4
     3.1.  Assumptions . . . . . . . . . . . . . . . . . . . . . . .   4
     3.2.  Sample Use Cases  . . . . . . . . . . . . . . . . . . . .   4
       3.2.1.  Basic IPv4 Router . . . . . . . . . . . . . . . . . .   4
         3.2.1.1.  Distributing the Basic IPv4 Router  . . . . . . .   6
       3.2.2.  Arbitrary Network Function  . . . . . . . . . . . . .   7
         3.2.2.1.  Distributing the Arbitrary Network Function . . .   8
   4.  Inter-FE LFB Overview . . . . . . . . . . . . . . . . . . . .   8
     4.1.  Inserting the Inter-FE LFB  . . . . . . . . . . . . . . .   8
   5.  Inter-FE Ethernet Connectivity  . . . . . . . . . . . . . . .  10
     5.1.  Inter-FE Ethernet Connectivity Issues . . . . . . . . . .  10
       5.1.1.  MTU Consideration . . . . . . . . . . . . . . . . . .  10
       5.1.2.  Quality-of-Service Considerations . . . . . . . . . .  11
       5.1.3.  Congestion Considerations . . . . . . . . . . . . . .  11
     5.2.  Inter-FE Ethernet Encapsulation . . . . . . . . . . . . .  12
   6.  Detailed Description of the Ethernet Inter-FE LFB . . . . . .  13
     6.1.  Data Handling . . . . . . . . . . . . . . . . . . . . . .  13
       6.1.1.  Egress Processing . . . . . . . . . . . . . . . . . .  14
       6.1.2.  Ingress Processing  . . . . . . . . . . . . . . . . .  15
     6.2.  Components  . . . . . . . . . . . . . . . . . . . . . . .  16
     6.3.  Inter-FE LFB XML Model  . . . . . . . . . . . . . . . . .  17
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  21
   8.  IEEE Assignment Considerations  . . . . . . . . . . . . . . .  21
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .  22
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  23
     10.1.  Normative References . . . . . . . . . . . . . . . . . .  23
     10.2.  Informative References . . . . . . . . . . . . . . . . .  24
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .  25
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  25

1.  Introduction

   In the ForCES architecture, a packet service can be modeled by
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