BCP 198

RFC 7608

IPv6 Prefix Length Recommendation for Forwarding, July 2015

Canonical URL:
https://www.rfc-editor.org/bcp/bcp198.txt
File formats:
Plain TextPDF
Status:
BEST CURRENT PRACTICE
Authors:
M. Boucadair
A. Petrescu
F. Baker
Stream:
IETF
Source:
v6ops (ops)

Cite this BCP: TXT

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Abstract

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.


For the definition of Status, see RFC 2026.

For the definition of Stream, see RFC 4844.


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