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Removing a Restriction on the use of MPLS Explicit NULL
RFC 4182

Revision differences

Document history

Date By Action
2026-05-20
(System) Changed metadata: changed keywords to '['multiprotocol label switching', 'ipv4 explicit null']' from '[]'
2026-05-20
(System) Metadata update from RFC Editor
2026-05-20
(System)
Changed author "E. Rosen": changed name from "Eric Rosen" to "E. Rosen", changed affiliation from "Cisco Systems" to "Cisco Systems, Inc.", cleared country (was "Boxborough, …
Changed author "E. Rosen": changed name from "Eric Rosen" to "E. Rosen", changed affiliation from "Cisco Systems" to "Cisco Systems, Inc.", cleared country (was "Boxborough, MA 01719"), changed order from "0" to "1"
2026-05-20
(System) Metadata update from RFC Editor
2020-01-21
(System) Received changes through RFC Editor sync (added Verified Errata tag)
2018-12-20
(System)
Received changes through RFC Editor sync (changed abstract to 'The label stack encoding for Multi-protocol Label Switching (MPLS) defines a reserved label value known as …
Received changes through RFC Editor sync (changed abstract to '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]')
2015-10-14
(System) Notify list changed from swallow@cisco.com, loa@pi.se to (None)
2005-09-14
Amy Vezza State Changes to RFC Published from RFC Ed Queue by Amy Vezza
2005-09-14
Amy Vezza [Note]: 'RFC 4182' added by Amy Vezza
2005-09-13
(System) RFC published