neutron/releasenotes/notes/dhcp-ipv6-address-update-ff...

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---
fixes:
- There is a race condition when adding ports in DHCP namespaces where an
IPv6 address could be dynamically created via SLAAC from a Router
Advertisement sent from the L3 agent, leading to a failure to start the
DHCP agent. This bug has been fixed, but care must be taken on an upgrade
dealing with any potentially stale dynamic addresses. For more
information, see bug `1627902 <https://launchpad.net/bugs/1627902>`_.
upgrade:
- On upgrade, IPv6 addresses in DHCP namespaces that have been created
dynamically via SLAAC will be removed, and static IPv6 addresses will be
added instead.