Here is some more information from my unpublished document on
site-locals. Maybe after Atlanta I'll finally get around to
publishing it...
This section concerns the suppose advantages that IPv6 site-local
addresses have for long-lived connections (please debunk if I'm
mistaken!).
Margaret
A much-touted advantage of site-local addressing is that it will
allow site-local, long-lived IPv6 connections to survive
renumbering of global prefixes. Global prefix renumbering could
happen when an organization switches from one ISP to another, or
when an ISP renumbers its internal network, changing the prefixes
assigned to customers.
There is, however, a potential risk to using site-local addresses
for long-lived connections. Those connections may fail when a site
becomes partitioned, even if global connectivity is still available
between the partitions.
To make a wise decision about whether to use site-local or global
addresses for long-lived intra-site connections, it is necessary to
weigh the expected frequency of renumbering against the expected
frequency of site partitioning. Since the frequency of these
events will vary widely between sites, there is no single answer
that would be best for all sites.
It should also be noted that there are many reasons why a long-
lived connection might fail, including network outages, system
restarts or local network reconfiguration. Any application that
depends upon the reliability of a long-lived connection will still
need to include a mechanism to re-initiate a lost connection.
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