Forwarding and Control Element Separation (ForCES) Model Extension
RFC 7408

Document Type RFC - Proposed Standard (November 2014; No errata)
Updates RFC 5812
Last updated 2015-10-14
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Internet Engineering Task Force (IETF)                     E. Haleplidis
Request for Comments: 7408                          University of Patras
Updates: 5812                                              November 2014
Category: Standards Track
ISSN: 2070-1721

   Forwarding and Control Element Separation (ForCES) Model Extension

Abstract

   This memo extends the Forwarding and Control Element Separation
   (ForCES) model defined in RFC 5812 and updates that RFC to allow
   complex data types for metadata, optional default values for data
   types, and optional access types for structures.  It also fixes an
   issue with Logical Functional Block (LFB) inheritance and introduces
   two new features: a new event condition called eventBecomesEqualTo
   and LFB properties.  The changes introduced in this memo do not alter
   the protocol and retain backward compatibility with older LFB models.

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 5741.

   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/rfc7408.

Copyright Notice

   Copyright (c) 2014 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.

Haleplidis                   Standards Track                    [Page 1]
RFC 7408                 ForCES Model Extension            November 2014

Table of Contents

   1. Introduction ....................................................2
      1.1. Requirements Language ......................................3
      1.2. Terminology ................................................3
   2. ForCES Model Extensions .........................................3
      2.1. Complex Data Types for Metadata ............................3
      2.2. Optional Default Values for Data Types .....................5
      2.3. Optional Access Types for Structs ..........................8
      2.4. New Event Condition: eventBecomesEqualTo ..................11
      2.5. LFB Properties ............................................12
      2.6. LFB Class Inheritance .....................................14
      2.7. Enhancing XML Validation ..................................15
   3. XML Extension Schema for LFB Class Library Documents ...........15
   4. IANA Considerations ............................................29
   5. Security Considerations ........................................29
   6. References .....................................................30
      6.1. Normative References ......................................30
      6.2. Informative References ....................................30
   Acknowledgements ..................................................31
   Author's Address ..................................................31

1.  Introduction

   The ForCES model [RFC5812] presents a formal way to define Forwarding
   Element (FE) Logical Functional Blocks (LFBs) using the eXtensible
   Markup Language (XML).  [RFC5812] was published several years before
   this document, and experience with its use has demonstrated the need
   to add new modeling concepts and change existing ones.

   Specifically, this document updates the ForCES model [RFC5812] to
   allow complex data types for metadata (Section 2.1), optional default
   values for data types (Section 2.2), and optional access types for
   structures (Section 2.3).  It also fixes an issue with LFB class
   inheritance (Section 2.6).  Additionally, the document introduces two
   new features: a new event condition named eventBecomesEqualTo
   (Section 2.4) and LFB properties (Section 2.5).

   These extensions are an update to the ForCES model [RFC5812] and do
   not require any changes to the ForCES protocol [RFC5810] as they are
   simply changes to the schema definition.  Additionally, backward
   compatibility is ensured as XML libraries produced with the earlier
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