Issues with instances created on newly scaled out compute

Issue

• Nova shows the interface's port state of an instance as down.

  nova interface-list 6ed818c4-e3cb-4ed4-b335-95d2c3888b0b
  +------------+-------------------------------------------+-----------------------------------------------+--------------+-------------------+
  | Port State   | Port ID                                                               | Net ID                                                                     | IP addresses  | MAC Addr               |
  +------------+--------------------------------------------+----------------------------------------------+-+------------+-------------------+
  | DOWN        | bf1e595c-8344-4aba-ab97-2542691f1700 | f7c876ff-cb83-4c04-939f-f0040e06b165 | xx.xx.xx.xx       | 52:54:00:52:37:0e |
  +------------+--------------------------------------------+----------------------------------------------+--------------+--------------------+
  

• Also, the instance gets stuck in BUILD state

  [stack@director ~]$ openstack server show 816576e4-d1ec-4c93-822b-44c181ed7406
  | OS-EXT-STS:vm_state                  | building                                             |