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[Thierry Carrez <thierry.carrez+lp@xxxxxxxxx>]

** Changed in: neutron
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1268762

Title:
  Remove and recreate interfacein ovs  if already exists

Status in OpenStack Neutron (virtual network service):
  Fix Released
Status in neutron havana series:
  Fix Released

Bug description:
  If the dhcp-agent machine restarts and openvswitch logs the following
  warning message for all tap interfaces that have not been recreated yet:

  bridge|WARN|could not open network device tap2cf7dbad-9d (No such
  device)

  Once the dhcp-agent starts he recreates the interfaces and readds them to the
  ovs-bridge. Unfortinately, ovs does not reinitalize the interface as its
  already in ovsdb and does not assign it an ofport number.

  In order to correct this we should first remove interfaces that exist and
  then readd them. 

  
  root@arosen-desktop:~# ovs-vsctl  -- --may-exist add-port br-int fake1

  # ofport still -1
  root@arosen-desktop:~# ovs-vsctl  list inter | grep -A 2 fake1
  name                : "fake1"
  ofport              : -1
  ofport_request      : []
  root@arosen-desktop:~# ip link add fake1 type veth peer name fake11
  root@arosen-desktop:~# ifconfig fake1
  fake1     Link encap:Ethernet  HWaddr 56:c3:a1:2b:1f:f4  
            BROADCAST MULTICAST  MTU:1500  Metric:1
            RX packets:0 errors:0 dropped:0 overruns:0 frame:0
            TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
            collisions:0 txqueuelen:1000 
            RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

  root@arosen-desktop:~# ovs-vsctl  list inter | grep -A 2 fake1
  name                : "fake1"
  ofport              : -1
  ofport_request      : []
  root@arosen-desktop:~# ovs-vsctl  -- --may-exist add-port br-int fake1
  root@arosen-desktop:~# ovs-vsctl  list inter | grep -A 2 fake1
  name                : "fake1"
  ofport              : -1
  ofport_request      : []

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