Path Computation Element Communication Protocol Extensions for Segment Routing
RFC 8664, “Path Computation Element Communication Protocol Extensions for Segment Routing”, is a Proposed Standard document published in December 2019 by S. Sivabalan, C. Filsfils, J. Tantsura, W. Henderickx, J. Hardwick. It updates RFC 8408. It has since been updated by RFC 9756. The canonical text is published by the RFC Editor.
Abstract
Segment Routing (SR) enables any head-end node to select any path without relying on a hop-by-hop signaling technique (e.g., LDP or RSVP-TE). It depends only on "segments" that are advertised by link-state Interior Gateway Protocols (IGPs). An SR path can be derived from a variety of mechanisms, including an IGP Shortest Path Tree (SPT), an explicit configuration, or a Path Computation Element (PCE). This document specifies extensions to the Path Computation Element Communication Protocol (PCEP) that allow a stateful PCE to compute and initiate Traffic-Engineering (TE) paths, as well as a Path Computation Client (PCC) to request a path subject to certain constraints and optimization criteria in SR networks.
This document updates RFC 8408.
What “Proposed Standard” means
An entry-level standards-track specification: stable, peer-reviewed and a solid basis for implementation, though it may still evolve before becoming an Internet Standard.
The canonical text of RFC 8664 is hosted at rfc-editor.org. Available in HTML,TXT,PDF,XML.
- RFC 8663 MPLS Segment Routing over IP
- RFC 8665 OSPF Extensions for Segment Routing
- RFC 8662 Entropy Label for Source Packet Routing in Networking Tunnels
- RFC 8666 OSPFv3 Extensions for Segment Routing
- RFC 8661 Segment Routing MPLS Interworking with LDP
- RFC 8667 IS-IS Extensions for Segment Routing
- RFC 8660 Segment Routing with the MPLS Data Plane
- RFC 8668 Advertising Layer 2 Bundle Member Link Attributes in IS-IS