I-D Action: draft-litkowski-pce-state-sync-08.txt
internet-drafts@ietf.org Mon, 13 July 2020 02:40 UTC
Return-Path: <internet-drafts@ietf.org>
X-Original-To: i-d-announce@ietf.org
Delivered-To: i-d-announce@ietfa.amsl.com
Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 100153A092D for <i-d-announce@ietf.org>; Sun, 12 Jul 2020 19:40:48 -0700 (PDT)
MIME-Version: 1.0
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: 7bit
From: internet-drafts@ietf.org
To: i-d-announce@ietf.org
Subject: I-D Action: draft-litkowski-pce-state-sync-08.txt
X-Test-IDTracker: no
X-IETF-IDTracker: 7.8.0
Auto-Submitted: auto-generated
Precedence: bulk
Message-ID: <159460804803.2421.9710890034365965890@ietfa.amsl.com>
Date: Sun, 12 Jul 2020 19:40:48 -0700
Archived-At: <https://mailarchive.ietf.org/arch/msg/i-d-announce/LAibMGAnM_79waG_lIEyfdbhPKM>
X-BeenThere: i-d-announce@ietf.org
X-Mailman-Version: 2.1.29
List-Id: Internet Draft Announcements only <i-d-announce.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/i-d-announce>, <mailto:i-d-announce-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/i-d-announce/>
List-Post: <mailto:i-d-announce@ietf.org>
List-Help: <mailto:i-d-announce-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/i-d-announce>, <mailto:i-d-announce-request@ietf.org?subject=subscribe>
X-List-Received-Date: Mon, 13 Jul 2020 02:40:48 -0000
A New Internet-Draft is available from the on-line Internet-Drafts directories. Title : Inter Stateful Path Computation Element (PCE) Communication Procedures. Authors : Stephane Litkowski Siva Sivabalan Cheng Li Haomian Zheng Filename : draft-litkowski-pce-state-sync-08.txt Pages : 31 Date : 2020-07-12 Abstract: The Path Computation Element Communication Protocol (PCEP) provides mechanisms for Path Computation Elements (PCEs) to perform path computations in response to Path Computation Clients (PCCs) requests. The stateful PCE extensions allow stateful control of Multi-Protocol Label Switching (MPLS) Traffic Engineering Label Switched Paths (TE LSPs) using PCEP. A Path Computation Client (PCC) can synchronize an LSP state information to a Stateful Path Computation Element (PCE). The stateful PCE extension allows a redundancy scenario where a PCC can have redundant PCEP sessions towards multiple PCEs. In such a case, a PCC gives control on a LSP to only a single PCE, and only one PCE is responsible for path computation for this delegated LSP. There are some use cases, where an inter-PCE stateful communication can bring additional resiliency in the design, for instance when some PCC-PCE sessions fails. The inter-PCE stateful communication may also provide a faster update of the LSP states when such an event occurs. Finally, when, in a redundant PCE scenario, there is a need to compute a set of paths that are part of a group (so there is a dependency between the paths), there may be some cases where the computation of all paths in the group is not handled by the same PCE: this situation is called a split-brain. This split-brain scenario may lead to computation loops between PCEs or suboptimal path computation. This document describes the procedures to allow a stateful communication between PCEs for various use-cases and also the procedures to prevent computations loops. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-litkowski-pce-state-sync/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-litkowski-pce-state-sync-08 https://datatracker.ietf.org/doc/html/draft-litkowski-pce-state-sync-08 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-litkowski-pce-state-sync-08 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/
- I-D Action: draft-litkowski-pce-state-sync-08.txt internet-drafts