IPv6 Prefix Length Recommendation for Forwarding (RFC7608)
Original Publication Date: 2015-Jul-01
Included in the Prior Art Database: 2015-Jul-24
Internet Society Requests For Comment (RFCs)
M. Boucadair: AUTHOR [+3]
Discussions on the 64-bit boundary in IPv6 addressing ([RFC7421]) revealed a need for a clear recommendation on which bits must be used by forwarding decision-making processes. However, such a recommendation was out of scope for that document.
Internet Engineering Task Force (IETF) M. Boucadair Request for Comments: 7608 France Telecom BCP: 198 A. Petrescu Category: Best Current Practice CEA, LIST ISSN: 2070-1721 F. Baker Cisco Systems July 2015
IPv6 Prefix Length Recommendation for Forwarding
IPv6 prefix length, as in IPv4, is a parameter conveyed and used in IPv6 routing and forwarding processes in accordance with the Classless Inter-domain Routing (CIDR) architecture. The length of an IPv6 prefix may be any number from zero to 128, although subnets using stateless address autoconfiguration (SLAAC) for address allocation conventionally use a /64 prefix. Hardware and software implementations of routing and forwarding should therefore impose no rules on prefix length, but implement longest-match-first on prefixes of any valid length.
Status of This Memo
This memo documents an Internet Best Current Practice.
This document is a product of the Internet Engineering Task Force (IETF). It represents the consensus of the IETF community. It has received public review and has been approved for publication by the Internet Engineering Steering Group (IESG). Further information on BCPs is available in Section 2 of RFC 5741.
Information about the current status of this document, any errata, and how to provide feedback on it may be obtained at http://www.rfc-editor.org/info/rfc7608.
al. Best Current Practice [Page 1]
RFC 7608 July 2015
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