Relationships between adress renumbering and DNS renumbering

              time:
old prefix	...======================================(7)==>(8)
new prefix	      (1)===(2)======================================...>
old AAAA/A6	...---------------------------(5)-->(6)
new AAAA/A6	                  (3)---(4)--------------------------...>

(1) Advertise the new prefix
(2) Confirm that the new prefix is operating stable enough
(3) Advertise new address onto DNS
(4) Confirm that the new prefix is advertised stable enough
(5) Remove DNS entries for old prefix
(6) Confirm that old DNS entries are gone
(7) Set preferred lifetime = 0 for old prefix (deprecated)
(8) Set valid lifetime = 0 for old prefix (addresses gone)