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

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https://bugs.launchpad.net/bugs/1940312

Title:
  Ussuri-only: Network segments are not tried out for allocation

Status in neutron:
  Fix Released

Bug description:
  * High level description: When we get a list of segments to choose
  from, and the first segment is already allocated, it fails right away
  returning RetryRequest exception, the the other segments are never
  tried out.

  I explain it a little further on the comments of PatchSet 1 here:
  https://review.opendev.org/c/openstack/neutron/+/803986/1

  This actually works at master due to a side effect of a refactoring
  that was done on
  
https://opendev.org/openstack/neutron/commit/6eaa6d83d7c7f07fd4bf04879c91582de504eff4
  to randomize the selection of segments, but on stable/ussuri, when not
  specifying the provider_network_type, we got into a situation where we
  had segments to allocate in vlan but neutron was allocating vxlan
  instead.

  * Pre-conditions: network_segment_range plugin enabled and several
  vlan project networks created on the system

  * Step-by-step reproduction steps: openstack --os-username
  'project1_admin' --os-password '******' --os-project-name project1
  --os-auth-url http://keystone.openstack.svc.cluster.local/v3 --os-
  user-domain-name Default --os-project-domain-name Default --os-
  identity-api-version 3 --os-interface internal --os-region-name
  RegionOne network create network11

  * Expected output: network created successfully (there was available
  ranges)

  * Actual output: HttpException: 503, Unable to create the network. No
  tenant network is available for allocation.

  * Version:
    ** OpenStack version: stable/ussuri
    ** Linux distro: Centos 7
    ** Deployment: StarlingX Openstack

  * Perceived severity: Major - System is usable in some circumstances

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