BCP 198

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RFC 7608: BCP 198: IPv6 Prefix Length Recommendation for Forwarding

Best Current Practice

M. Boucadair
A. Petrescu
F. Baker

July 2015
IETF publication
Operations and Management Area

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.

BCP 198

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RFC 7608: BCP 198: IPv6 Prefix Length Recommendation for Forwarding

Abstract

Abstract