Open Stack

Hi, All,
  I have a question about the Fuel PXE/Admin network(10.20.0.*) in Mirantis
Fuel 8.0.
That is, after successful deployment of openstack, do we still need this
network? I want to free the NIC occupied by this PXE network. Supposing we
do not plan to reinstall or upgrade the openstack in future, or simply put,
we want to remove the fuel server completely. In this case, what's the
meaning of this PXE/Admin network for a running openstack? And, if we can
remove this network, what the proper procedures to shutdown all
services/daemons/cron jobs related to this network? Thanks so much!

Cheers,
Dan
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