Unanswered Questions in the Path Computation Element Architecture

This RFC 7399 was published in 2014.

Abstract

The Path Computation Element (PCE) architecture is set out in RFC 4655.
The architecture is extended for multi-layer networking with the introduction of the Virtual Network Topology Manager (VNTM) in RFC 5623 and generalized to Hierarchical PCE (H-PCE) in RFC 6805.

RFC 7399 introduction

Over the years since the architecture for the Path Computation Element (PCE) was documented in [RFC4655], many new people have become involved in the work of the PCE working group and wish to use or understand the PCE architecture.
These people often missed out on early discussions within the working group and are unfamiliar with questions that were raised during the development of the documentation.

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