@techreport{ietf-pce-state-sync-11,
    number =    {draft-ietf-pce-state-sync-11},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-ietf-pce-state-sync/11/},
    author =    {Haomian Zheng and Stephane Litkowski and Siva Sivabalan and Cheng Li},
    title =     {{Procedures for Communication between Stateful Path Computation Elements}},
    pagetotal = 37,
    year =      2025,
    month =     jan,
    day =       13,
    abstract =  {The Path Computation Element (PCE) Communication Protocol (PCEP) provides mechanisms for 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 LSP state information to a Stateful Path Computation Element (PCE). A PCC can have multiple PCEP sessions towards multiple PCEs. In some use cases, inter-PCE stateful communication can bring additional resiliency in the design, for instance, when some PCC-PCE session fails. This document describes the procedures to allow stateful communication between PCEs for various use cases and also the procedures to prevent computational loops.},
}