Public bug reported:

vm cannot be created after a large number of virtual machines are
removed from the same node

1、create a security group, has remote security group rule
2、create 50 vms in same node(eg: node01) and use same security group created in 
step 1
3、delete all vms created in step 2
4、create some vms in nodeo1
5、all vms create failed. error is: Build instance <id> aborted: Failed to 
allocate the network(s), ...


By observing the database when creating the vm, it is found that port's L2 
block has not been removed.

** Affects: neutron
     Importance: Undecided
         Status: New


** Tags: api-ref

** Summary changed:

- vm cannot be created after a large number of virtual machines are removed 
from the same node
+ vm cannot be created after a large number of vms are removed from the same 
node

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https://bugs.launchpad.net/bugs/1870723

Title:
  vm cannot be created after a large number of vms are removed from the
  same node

Status in neutron:
  New

Bug description:
  vm cannot be created after a large number of virtual machines are
  removed from the same node

  1、create a security group, has remote security group rule
  2、create 50 vms in same node(eg: node01) and use same security group created 
in step 1
  3、delete all vms created in step 2
  4、create some vms in nodeo1
  5、all vms create failed. error is: Build instance <id> aborted: Failed to 
allocate the network(s), ...

  
  By observing the database when creating the vm, it is found that port's L2 
block has not been removed.

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