> Actually RFC 6204 (and its successor 7084) have a requirement that enforces
> keeping it in the RA for at least 2h. HNCP makes following 7084 mandatory
> atm.
If you're referring to RFC 7084's:
L-13: If the delegated prefix changes, i.e., the current prefix is
replaced with a new prefix without any overlapping time
period, then the IPv6 CE router MUST immediately advertise the
old prefix with a Preferred Lifetime of zero and a Valid
Lifetime of either a) zero or b) the lower of the current
Valid Lifetime and two hours (which must be decremented in
real time) in a Router Advertisement message as described in
Section 5.5.3, (e) of [RFC4862].
then this doesn't say to continue advertising for 2 hours. If the
immediately-sent RA has valid = preferred = 0 (which is one of the permitted
value combinations per the requirement), then I see no requirement for any
subsequent RA to be sent that includes this prefix.
Barbara
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