RFC 4950 · PROPOSED STANDARD · 2007
SUN · 14 JUN 2026
ICMP Extensions for Multiprotocol Label Switching
Overview
RFC 4950, “ICMP Extensions for Multiprotocol Label Switching”, is a Proposed Standard document published in August 2007 by R. Bonica, D. Gan, D. Tappan, C. Pignataro. The canonical text is published by the RFC Editor.
Abstract
This memo defines an extension object that can be appended to selected multi-part ICMP messages. This extension permits Label Switching Routers to append MPLS information to ICMP messages, and has already been widely deployed. [STANDARDS-TRACK]
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.
Read this RFC
The canonical text of RFC 4950 is hosted at rfc-editor.org. Available in TXT,HTML.
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