The IESG has approved the following document: - 'Codification of AS 0 processing.' (draft-ietf-idr-as0-06.txt) as Proposed Standard This document is the product of the Inter-Domain Routing Working Group. The IESG contact persons are Stewart Bryant and Adrian Farrel. A URL of this Internet Draft is: http://datatracker.ietf.org/doc/draft-ietf-idr-as0/ Technical Summary This document updates RFC 4271 and proscribes the use of Autonomous System (AS) 0 in the Border Gateway Protocol (BGP) OPEN and AS_PATH / AS4_PATH BGP attribute. This is important since although it has long been understood that zero is not a valid AS number, this restriction has never been formally specified. Working Group Summary There was active discussion in the WG and the document passed through a number of iterations reflecting that. In the end the document although short reflects a surprising amount of tuning. Document Quality There are at least two known BGP implementations that do not accept AS number 0 in an AS_PATH as specified in the draft. (Indeed, this appears to have been accepted implementation practice prior to the draft's publication.) Personnel John Scudder is the Document Shepherd. Stewart Bryant is the Responsible Area Director. RFC Editor Note OLD: 3. IANA Considerations The IANA is requested to update the Reference for number 0 in the "Autonomous System (AS) Numbers" registry to reference this document. NEW: 3. IANA Considerations The IANA is requested to update the registry for 16-bit Autonomous System Numbers so that the entry for AS 0 is simply Reserved. END
