Removing a Restriction on the use of MPLS Explicit NULL
RFC 4182, “Removing a Restriction on the use of MPLS Explicit NULL”, is a Proposed Standard document published in September 2005 by E. Rosen. It updates RFC 3032. It has since been updated by RFC 5462, RFC 7274. The canonical text is published by the RFC Editor.
Abstract
The label stack encoding for Multi-protocol Label Switching (MPLS) defines a reserved label value known as "IPv4 Explicit NULL" and a reserved label value known as "IPv6 Explicit NULL". Previously, these labels were only legal when they occurred at the bottom of the MPLS label stack. This restriction is now removed, so that these label values may legally occur anywhere in the stack.
This document updates RFC 3032. [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.
The canonical text of RFC 4182 is hosted at rfc-editor.org. Available in TXT,HTML.
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