Label Switched Path Ping for Segment Routing Path Segment Identifier with MPLS Data Plane
RFC 9884, “Label Switched Path Ping for Segment Routing Path Segment Identifier with MPLS Data Plane”, is a Proposed Standard document published in October 2025 by X. Min, S. Peng, L. Gong, R. Gandhi, C. Pignataro. The canonical text is published by the RFC Editor.
Abstract
Segment Routing (SR) leverages source routing to steer packets through an ordered list of instructions called "segments". SR can be instantiated over the MPLS data plane. Path Segment Identifiers (PSIDs) are used to identify and correlate bidirectional or end-to-end paths in SR networks. This document defines procedures (i.e., six new Target Forwarding Equivalence Class (FEC) Stack sub-TLVs) for the use of LSP Ping to support connectivity verification and fault isolation for SR paths that include PSIDs. The mechanisms described enable the validation and tracing of SR paths with Path SIDs in MPLS networks, complementing existing SR-MPLS Operations, Administration, and Maintenance (OAM) capabilities.
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 9884 is hosted at rfc-editor.org. Available in HTML,TXT,PDF,XML.
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