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Reaction of IPv6 Stateless Address Autoconfiguration (SLAAC) to Flash-Renumbering Events

In scenarios where network configuration information related to IPv6
prefixes becomes invalid without any explicit signaling of that
condition (such as when a CPE crashes and reboots without knowledge of
the previously-employed prefixes), nodes on the local network will
continue using stale prefixes for an unacceptably long period of time,
thus resulting in connectivity problems. This document documents this
problem, and discusses operational workarounds that may help to
improve network robustness. Additionally, it highlights areas where
further work may be needed.