RIPE Routing Working Group Recommendations on IPv6 Route Aggregation
====================================================================

3 November 2011
Document-ID: ripe-532


Rob Evans
Philip Smith


Introduction
============

Recent discussion has shown there is a limited requirement to be able
to advertise more specific prefixes from an IPv6 Provider Aggregatable
(PA) allocation where a Local Internet Registry (LIR) contains several
networks which are not interconnected, or for traffic engineering
purposes.  This document recommends such advertisements are limited
in both length and scope.  It is intended to supplement the working
group's Recommendations on Route Aggregation [RIPE-399].


Background
==========

The IPv6 address allocation and assignment policy for the RIPE NCC
Service Region [V6-ALLOC] only allows LIRs to obtain more than the
minimum PA allocation if they can demonstrate address utilisation that
requires it.  This fits with the address space management principle of
conservation.  However, as understood in t