{"draft":"draft-ietf-mpls-explicit-null-02","doc_id":"RFC4182","title":"Removing a Restriction on the use of MPLS Explicit NULL","authors":["E. Rosen"],"format":["ASCII","HTML"],"page_count":"7","pub_status":"PROPOSED STANDARD","status":"PROPOSED STANDARD","source":"Multiprotocol Label Switching","abstract":"The label stack encoding for Multi-protocol Label Switching (MPLS)\r\ndefines a reserved label value known as \"IPv4 Explicit NULL\" and a\r\nreserved label value known as \"IPv6 Explicit NULL\".  Previously, these\r\nlabels were only legal when they occurred at the bottom of the MPLS\r\nlabel stack.  This restriction is now removed, so that these label\r\nvalues may legally occur anywhere in the stack.\r\n\r\nThis document updates RFC 3032.  [STANDARDS-TRACK]","pub_date":"August 2005","keywords":["multiprotocol label switching","ipv4 explicit null"],"obsoletes":[],"obsoleted_by":[],"updates":["RFC3032"],"updated_by":["RFC5462","RFC7274"],"see_also":[],"doi":"10.17487\/RFC4182","errata_url":"https:\/\/www.rfc-editor.org\/errata\/rfc4182"}