Using Only Link-Local Addressing inside an IPv6 Network

This RFC 7404 was published in 2014.

Abstract

In an IPv6 network, it is possible to use only link-local addresses on infrastructure links between routers.
This document discusses the advantages and disadvantages of this approach to facilitate the decision process for a given network.

RFC 7404 introduction

An infrastructure link between a set of routers typically does not require global or unique local addresses [RFC4193].
Using only link- local addressing on such links has a number of advantages; for example, routing tables do not need to carry link addressing and can therefore be significantly smaller.
This helps to decrease failover times in certain routing convergence events.
An interface of a router is also not reachable beyond the link boundaries, therefore reducing the attack surface.

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