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Status:

INFORMATIONAL

Authors:

D. Dhody
Y. Lee
D. Ceccarelli
J. Shin
D. King

Stream:

IETF

Source:

pce (rtg)

Cite this RFC:TXT  | XML  |  BibTeX

DOI:  https://doi.org/10.17487/RFC8751

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Abstract

A stateful Path Computation Element (PCE) maintains information onthe current network state received from the Path Computation Clients(PCCs), including computed Label Switched Paths (LSPs), reservedresources within the network, and pending path computation requests.This information may then be considered when computing the path for anew traffic-engineered LSP or for any associated/dependent LSPs. Thepath-computation response from a PCE helps the PCC to gracefullyestablish the computed LSP.

The Hierarchical Path Computation Element (H-PCE) architecture allowsthe optimum sequence of interconnected domains to be selected andnetwork policy to be applied if applicable, via the use of ahierarchical relationship between PCEs.

Combining the capabilities of stateful PCE and the hierarchical PCEwould be advantageous. This document describes general considerationsand use cases for the deployment of stateful, but not stateless, PCEsusing the hierarchical PCE architecture.

For the definition ofStatus,seeRFC 2026.

For the definition ofStream, seeRFC 8729.