Comment 2 for bug 1485905

From astute.log

    net04_ext:
      shared: false
      L2:
        network_type: local
        router_ext: true
        physnet:
        segment_id:
      L3:
        nameservers: []
        subnet: 10.109.1.0/24
        floating: 10.109.1.13:10.109.1.14
        gateway: 10.109.1.1
        enable_dhcp: false
      tenant: admin

I think, 10.109.1.13:10.109.1.14 indicates the problem here: one IP address must be used for a neutron router. and there is no IPs left to be used by tenants