%% You should probably cite draft-ietf-pce-state-sync-11 instead of this revision. @techreport{ietf-pce-state-sync-08, number = {draft-ietf-pce-state-sync-08}, 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/08/}, author = {Stephane Litkowski and Siva Sivabalan and Cheng Li and Haomian Zheng}, title = {{Procedures for Communication between Stateful Path Computation Elements}}, pagetotal = 35, year = , month = , day = , 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. 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. This document describes the procedures to allow stateful communication between PCEs for various use-cases and also the procedures to prevent computations loops.}, }