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[OpenStack Infra <1616208@xxxxxxxxxxxxxxxxxx>]

Fix proposed to branch: master
Review: https://review.openstack.org/433234

** Changed in: neutron
       Status: Invalid => In Progress

** Changed in: neutron
     Assignee: (unassigned) => Sindhu Devale (sindhu-devale-3)

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https://bugs.launchpad.net/bugs/1616208

Title:
  [RFE] Support creating a subnet without an allocation pool

Status in neutron:
  In Progress
Status in python-openstackclient:
  New

Bug description:
  Problem Description
  ===================

  Currently, subnets are created with an allocation pool(s) that is
  either a) user-defined or b) automatically generated based on CIDR.
  This RFE asks that the community support the creation of subnets
  without an allocation pool.

  Neutron allows users to create ports using fixed IP addresses that
  fall outside of the subnet allocation pool(s) but within the range
  defined by the CIDR. Neutron keeps track of assigned addresses and
  does not allow for overlap within the same subnet.

  Use cases:
  * An external IPAM service is utilized that is not integrated with OpenStack/Neutron. The user wants to create a port with a specific IP address using the --fixed-ip flag, and does not want Neutron automatically consuming addresses from the pool if an address is not manually allocated via Neutron or Nova. 

  
  Proposed Change
  ===============

  
  Allow 'None', or similar value, as a valid start/end value. The result would be that Neutron would not create an allocation pool for the subnet. The Neutron client would have a new flag, such as --no-allocation-pool, or something similar.

  As I see it, not creating an allocation pool for a subnet would mean
  that when a port is created without an IP specified, Neutron would
  return the 'no more addresses available for allocation' error.
  Otherwise, the current behavior of allowing the user to specify a
  particular fixed IP address remains the same.

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