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Public bug reported:

[Summary]
internal server error returned when create a subnet via subnetpool 
for which prefixlen 32 is specified

[Topo]
devstack all-in-one node

[Description and expect result]
no error returned when create a subnet via subnetpool for 
which prefixlen 32 is specified

[Reproduceable or not]
reproduceable 

[Recreate Steps]
1) create a subnetpool:
root@45-59:/opt/stack/devstack# neutron subnetpool-show pool1
+-------------------+--------------------------------------+
| Field             | Value                                |
+-------------------+--------------------------------------+
| address_scope_id  |                                      |
| default_prefixlen | 27                                   |
| default_quota     |                                      |
| id                | bfc49547-7883-47d5-af43-1d7825ef6fbf |
| ip_version        | 4                                    |
| is_default        | False                                |
| max_prefixlen     | 32                                   |
| min_prefixlen     | 8                                    |
| name              | pool1                                |
| prefixes          | 100.0.0.0/24                         |
| shared            | False                                |
| tenant_id         | 72a70635fa0c42a2bcba67edd760d516     |
+-------------------+--------------------------------------+

2) create a subnet via subnetpool while prefixlen 32 is specified:
root@45-59:/opt/stack/devstack# neutron subnet-create --subnetpool pool1
 --prefixlen 32 net2 --name sub10
Request Failed: internal server error while processing your request. >>>ISSUE
root@45-59:/opt/stack/devstack# 
root@45-59:/opt/stack/devstack#

[Configration]
reproduceable bug, no need

[logs]
reproduceable bug, no need

[Root cause anlyze or debug inf]
reproduceable bug

[Attachment]
None

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1531401

Title:
  internal server error returned when create a subnet via subnetpool for
  which prefixlen 32 is specified

Status in neutron:
  New

Bug description:
  [Summary]
  internal server error returned when create a subnet via subnetpool 
  for which prefixlen 32 is specified

  [Topo]
  devstack all-in-one node

  [Description and expect result]
  no error returned when create a subnet via subnetpool for 
  which prefixlen 32 is specified

  [Reproduceable or not]
  reproduceable 

  [Recreate Steps]
  1) create a subnetpool:
  root@45-59:/opt/stack/devstack# neutron subnetpool-show pool1
  +-------------------+--------------------------------------+
  | Field             | Value                                |
  +-------------------+--------------------------------------+
  | address_scope_id  |                                      |
  | default_prefixlen | 27                                   |
  | default_quota     |                                      |
  | id                | bfc49547-7883-47d5-af43-1d7825ef6fbf |
  | ip_version        | 4                                    |
  | is_default        | False                                |
  | max_prefixlen     | 32                                   |
  | min_prefixlen     | 8                                    |
  | name              | pool1                                |
  | prefixes          | 100.0.0.0/24                         |
  | shared            | False                                |
  | tenant_id         | 72a70635fa0c42a2bcba67edd760d516     |
  +-------------------+--------------------------------------+

  2) create a subnet via subnetpool while prefixlen 32 is specified:
  root@45-59:/opt/stack/devstack# neutron subnet-create --subnetpool pool1
   --prefixlen 32 net2 --name sub10
  Request Failed: internal server error while processing your request. >>>ISSUE
  root@45-59:/opt/stack/devstack# 
  root@45-59:/opt/stack/devstack#

  [Configration]
  reproduceable bug, no need

  [logs]
  reproduceable bug, no need

  [Root cause anlyze or debug inf]
  reproduceable bug

  [Attachment]
  None

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