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[huang liujie <1834979@xxxxxxxxxxxxxxxxxx>]

** Changed in: neutron
       Status: Confirmed => Opinion

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https://bugs.launchpad.net/bugs/1834979

Title:
  port status became active after update network，subnet

Status in neutron:
  Confirmed

Bug description:
  Pre-conditions: 
      Neutron （Pike）,firewall_driver=openvswitch

  Reproduction steps:
      1.create vm-A with net-A
      2.shutoff vm-A
      3.show port status of vm-A 
      4.update net-A ，change its name to 'net-A-rename'
      5.show port status of vm-A

  Description:
      After step 2,we can find the port status of vm-A is down,and at this moment there is no related tap device in br-int.This make sense.
      But,after step 4,the status became active,there is still no tap device,and vm-A still shutoff.This doesn't make any sense.We just change network name.This behavior has no relation to port status .
      According to code,we find that DHCP agent (_dhcp_ready_ports_loop->dhcp_ready_on_ports)will notify neutron server to make ports active each time after network,subnet,port,updated.Why this logic?

  Any ideas?

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