PA is just a general purpose distributed numbering algorithm. The way you
handle lifetimes is out
of the scope of PA. But it surely is in the scope of HNCP (ietf-homenet-hncp).
HNCP attaches the preferred and valid lifetimes to each delegated prefix, which
are in turn provided to the hosts by the
mean of RAs.
In the make-before-break case, PA numbers the links with the new prefix before
removing the prefixes associated with the old one.
It let hosts renumber gracefully based on preferred lifetime values.
Right. So the next question is: what will trigger HNCP to start this
process? RFC 4192 seems to assume a guiding intelligence performing a
careful sequence of actions.
A variety of events are possible, in general HNCP references RFC 7084
here, i.e. homenet routers support DHCPv6-PD, the DHCPv6 dynamic
reconfigure mechanism and in addition possibly 6rd as sources of IPv6
prefixes. So either of those usually or other events such as a link-down
on an uplink interface etc.
Cheers,
Steven
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