Currently, Neutron's dhcp agent only supports Dnsmasq. Dnsmasq has a very serious limitation that, it needs a reload any time when hosts, opts or addn hosts configs are updated. According to a blog [1], this can take unto 4 minutes with 65535 static leases.
Typical industry standard is to use isc-dhcpd [2] instead of Dnsmasq. In general isc-dhcpd has more features than Dnsmasq. It also supports OMAPI, which allows updating host or lease objects runtime. There are two ways to use OMAPI: omshell [3] and pypureomapi python library [4], [5]. With OMAPI, its very easy to selectively add/delete a host/lease from configuration (as against updating full config on every create/update port)
Considering that most of the industry uses isc-dhcpd, I think it will be a great addition to OpenStack neutron.
[1] https://www.mirantis.com/blog/improving-dhcp-performance-openstack/
[2] https://www.isc.org/downloads/dhcp/
[3] http://linux.die.net/man/1/omshell
[4] https://pypi.python.org/pypi/pypureomapi
[5] https://github.com/CygnusNetworks/pypureomapi
I like it. /github. com/openstack/ neutron/ blob/master/ doc/source/ policies/ blueprints. rst#rfe- submission- guidelines
but seems we need to refactor it by https:/