Forwarding and Control Element Separation (ForCES) Model Extension

This RFC 7408 was published in 2014.

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.

RFC 7408 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.

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