I-D Action: draft-litkowski-pce-state-sync-00.txt

internet-drafts@ietf.org Wed, 26 October 2016 16:33 UTC

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Subject: I-D Action: draft-litkowski-pce-state-sync-00.txt
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Date: Wed, 26 Oct 2016 09:33:50 -0700
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A New Internet-Draft is available from the on-line Internet-Drafts directories.

Title : Enhancing redundant stateful PCE architecture to support LSP association constraint based computation
Authors : Stephane Litkowski
Siva Sivabalan
Filename : draft-litkowski-pce-state-sync-00.txt
Pages : 24
Date : 2016-10-26

Abstract:
[I-D.ietf-pce-stateful-pce] defines stateful extensions for Path
Computation Element Communication Protocol (PCEP). A Path
Computation Client (PCC) can synchronize an LSP state information to
a Path Computation Element (PCE). [I-D.ietf-pce-stateful-pce] allows
for PCE redundancy 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
path computation for a particular LSP is linked to another: the most
common use case is path disjointness. The set of LSPs that are
dependant to each other may start from different head-ends. In such
a case, we cannot guarantee that at any time all the head-ends
(acting as PCCs) will delegate their LSP to the same PCE. This
scenario where a group of dependant LSPs are delegated to multiple
PCEs is called a split-brain scenario. This split-brain scenario may
lead to computation loops between PCEs. This document proposes a
solution to enhance redundant stateful PCE architecture to overcome
those issues.

The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-litkowski-pce-state-sync/

There's also a htmlized version available at:
https://tools.ietf.org/html/draft-litkowski-pce-state-sync-00

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:
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I-D Action: draft-litkowski-pce-state-sync-00.txt internet-drafts