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[Prateek khushalani <prateek.khushalani@xxxxxxxxx>]

I did an analysis on the change. The changes will have to be made on
neutron-server and neutronclient(CLI). Here are the list of changes that
will be done

Neutronclient side-

1. A new command to be added.
2. A new resource to be created
3. The resource will take subnet-id and return available IP's in the allocation range.

Neutron-server side-

1. A new api will be created.
2. The api will accept subnet-id and return list of available  IP's in the allocation range.

** Also affects: python-neutronclient
   Importance: Undecided
       Status: New

** Changed in: python-neutronclient
     Assignee: (unassigned) => Prateek khushalani (prateek-khushalani)

** Changed in: python-neutronclient
       Status: New => In Progress

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https://bugs.launchpad.net/bugs/1526587

Title:
  Neutron doesn't have a command to show the available IP addresses for
  one subnet

Status in neutron:
  In Progress
Status in python-neutronclient:
  In Progress

Bug description:
  Neutron doesn't have a command to show the allocated ip addresses for
  one subnet.

  We can get the allocated ip list with command:
  [root@cts-orch ~]# neutron port-list | grep `neutron subnet-show 110-OAM2 | awk '/ id / {print $4}'` | cut -d"|" -f5 | cut -d":" -f3 | sort
   "135.111.122.97"}
   "135.111.122.98"}

  But we don't have a command to show the available ips for one subnet.
  I write a shell script to show the available ports as below, but it
  will be helpful if we can provide such a neutron command.

  [root@cts-orch ~]# ./show_available_ip.sh 110-OAM2
  135.111.122.99
  135.111.122.100
  135.111.122.101
  135.111.122.102
  135.111.122.103
  135.111.122.104
  135.111.122.105
  135.111.122.106
  135.111.122.107
  135.111.122.108
  135.111.122.109
  135.111.122.110
  135.111.122.111
  135.111.122.112
  135.111.122.113
  135.111.122.114
  135.111.122.115
  135.111.122.116
  135.111.122.117
  135.111.122.118
  135.111.122.119
  135.111.122.120
  135.111.122.121
  135.111.122.122
  135.111.122.123
  135.111.122.124
  Total Count: 26

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