I-D Action: draft-litkowski-pce-state-sync-09.txt
internet-drafts@ietf.org Mon, 02 November 2020 01:00 UTC
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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-09.txt Pages : 32 Date : 2020-11-01 Abstract: The Path Computation Element Communication Protocol (PCEP) provides mechanisms for Path Computation Elements (PCEs) to perform path computation in response to a Path Computation Client (PCC) request. The Stateful PCE extensions allow stateful control of Multi-Protocol Label Switching (MPLS) Traffic Engineering (TE) Label Switched Paths (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 of 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 session 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-09 https://datatracker.ietf.org/doc/html/draft-litkowski-pce-state-sync-09 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-litkowski-pce-state-sync-09 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/
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