Use of /127 Prefix Length Between Routers Considered Harmful
RFC 3627, “Use of /127 Prefix Length Between Routers Considered Harmful”, is a Historic document published in September 2003 by P. Savola. It has been obsoleted by RFC 6547 — refer to the newer document for the authoritative version. The canonical text is published by the RFC Editor.
Abstract
In some cases, the operational decision may be to use IPv6 /127 prefix lengths, especially on point-to-point links between routers. Under certain situations, this may lead to one router claiming both addresses due to subnet-router anycast being implemented. This document discusses the issue and offers a couple of solutions to the problem; nevertheless, /127 should be avoided between two routers.
What “Historic” means
A specification that has been superseded or is otherwise no longer recommended for use.
The canonical text of RFC 3627 is hosted at rfc-editor.org. Available in TXT,HTML.
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