Encoding of Data Structure (DS) in the Path Computation Element Communication Protocol (PCEP)

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Last updated 2014-03-03 (latest revision 2013-08-20)
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The ability to compute shortest constrained Traffic Engineering Label Switched Paths (TE LSPs) in Multiprotocol Label Switching (MPLS) and Generalized MPLS (GMPLS) networks across multiple domains has been identified as a key requirement for point-to-point (P2P) and point- to-multipoint (P2MP) scenarios. Backward-Recursive Path Computation (BRPC) [RFC5441] defines Virtual Shortest Path Tree (VSPT) as a default de-facto data structure for path reply message in inter- domain scenarios. As Path Computation Element (PCE) will get used in newer scenarios like inter-domain, protection, P2MP etc. As well as PCE is being explored to be used in Cross Stratrum Optimization (CSO) environment (see [CSO-PCE]) as well as in [ABNO]. Limiting PCE communication Protocol (PCEP) to just one data structure limits the usage of PCEP. Its important to keep PCEP generic enough to use differnt data structure and apply different algorithms. This document defines extensions to the PCEP to allow multiple data structures. Extensions are defined for PCE to indicate the set of Data Structure (DS) it supports; also Path Computation Client (PCC) or PCE can indicate in a path computation request the required DS, and a PCE can report in a path computation reply the Data Structure that was used in the path reply message.


Dhruv Dhody (dhruv.dhody@huawei.com)
Udayasree Palle (udayasree.palle@huawei.com)

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