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[shihanzhang <shihanzhang@xxxxxxxxxx>]

Public bug reported:

When we create a subnet,  neutron-server just check the subnet validation, and permit to create a D type subnet, 
for example: neutron subnet-create dhcp-test 224.0.0.0/8, but dhcp-agent will fail, the error log as bellow:
[-] Unable to enable dhcp for c07785a5-aa25-4939-b74f-481c1158ebcd.
Traceback (most recent call last):
  File "/opt/stack/neutron/neutron/agent/dhcp/agent.py", line 115, in call_driver
    getattr(driver, action)(**action_kwargs)
  File "/opt/stack/neutron/neutron/agent/linux/dhcp.py", line 203, in enable
    interface_name = self.device_manager.setup(self.network)
  File "/opt/stack/neutron/neutron/agent/linux/dhcp.py", line 1212, in setup
    self._set_default_route(network, interface_name)
  File "/opt/stack/neutron/neutron/agent/linux/dhcp.py", line 1015, in _set_default_route
    device.route.add_gateway(subnet.gateway_ip)
  File "/opt/stack/neutron/neutron/agent/linux/ip_lib.py", line 584, in add_gateway
    self._as_root([ip_version], tuple(args))
  File "/opt/stack/neutron/neutron/agent/linux/ip_lib.py", line 280, in _as_root
    use_root_namespace=use_root_namespace)
  File "/opt/stack/neutron/neutron/agent/linux/ip_lib.py", line 80, in _as_root
    log_fail_as_error=self.log_fail_as_error)
  File "/opt/stack/neutron/neutron/agent/linux/ip_lib.py", line 89, in _execute
    log_fail_as_error=log_fail_as_error)
  File "/opt/stack/neutron/neutron/agent/linux/utils.py", line 160, in execute
    raise RuntimeError(m)
RuntimeError: 
Command: ['ip', 'netns', 'exec', u'qdhcp-c07785a5-aa25-4939-b74f-481c1158ebcd', 'ip', '-4', 'route', 'replace', 'default', 'via', u'224.0.0.1',

Exit code: 2
Stdin: 
Stdout: 
Stderr: RTNETLINK answers: Network is unreachable

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1497522

Title:
  DHCP agent fail if create a D type subnet

Status in neutron:
  New

Bug description:
  When we create a subnet,  neutron-server just check the subnet validation, and permit to create a D type subnet, 
  for example: neutron subnet-create dhcp-test 224.0.0.0/8, but dhcp-agent will fail, the error log as bellow:
  [-] Unable to enable dhcp for c07785a5-aa25-4939-b74f-481c1158ebcd.
  Traceback (most recent call last):
    File "/opt/stack/neutron/neutron/agent/dhcp/agent.py", line 115, in call_driver
      getattr(driver, action)(**action_kwargs)
    File "/opt/stack/neutron/neutron/agent/linux/dhcp.py", line 203, in enable
      interface_name = self.device_manager.setup(self.network)
    File "/opt/stack/neutron/neutron/agent/linux/dhcp.py", line 1212, in setup
      self._set_default_route(network, interface_name)
    File "/opt/stack/neutron/neutron/agent/linux/dhcp.py", line 1015, in _set_default_route
      device.route.add_gateway(subnet.gateway_ip)
    File "/opt/stack/neutron/neutron/agent/linux/ip_lib.py", line 584, in add_gateway
      self._as_root([ip_version], tuple(args))
    File "/opt/stack/neutron/neutron/agent/linux/ip_lib.py", line 280, in _as_root
      use_root_namespace=use_root_namespace)
    File "/opt/stack/neutron/neutron/agent/linux/ip_lib.py", line 80, in _as_root
      log_fail_as_error=self.log_fail_as_error)
    File "/opt/stack/neutron/neutron/agent/linux/ip_lib.py", line 89, in _execute
      log_fail_as_error=log_fail_as_error)
    File "/opt/stack/neutron/neutron/agent/linux/utils.py", line 160, in execute
      raise RuntimeError(m)
  RuntimeError: 
  Command: ['ip', 'netns', 'exec', u'qdhcp-c07785a5-aa25-4939-b74f-481c1158ebcd', 'ip', '-4', 'route', 'replace', 'default', 'via', u'224.0.0.1',

  Exit code: 2
  Stdin: 
  Stdout: 
  Stderr: RTNETLINK answers: Network is unreachable

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