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Public bug reported:

[Summary]
can update the gateway of subnet with needless "0" in the ip address via cli

[Topo]
devstack all-in-one node

[Description and expect result]
if update the gateway of subnet with needless "0" in the ip address, the needless "0" can be cut off

[Reproduceable or not]
reproduceable 

[Recreate Steps]
1) create 1 subnet:
root@45-59:/opt/stack/devstack# neutron subnet-show sub-test
+-------------------+------------------------------------------------+
| Field             | Value                                          |
+-------------------+------------------------------------------------+
| allocation_pools  | {"start": "100.0.0.100", "end": "100.0.0.200"} |
| cidr              | 100.0.0.0/24                                   |
| dns_nameservers   |                                                |
| enable_dhcp       | True                                           |
| gateway_ip        | 100.0.0.1                                      |
| host_routes       |                                                |
| id                | 00dfe80b-911f-4cf1-8874-77639e6082c5           |
| ip_version        | 4                                              |
| ipv6_address_mode |                                                |
| ipv6_ra_mode      |                                                |
| name              | sub-test                                       |
| network_id        | 79292c3a-1c85-4014-b0d7-0f078f1a4ee8           |
| subnetpool_id     |                                                |
| tenant_id         | 71209fa21a7343e3b778ec5f4ff45252               |
+-------------------+------------------------------------------------+

2)update the gateway of subnet with needless "0" in the ip address:
root@45-59:/opt/stack/devstack# neutron subnet-update  --gateway 100.0.0.001 sub-test
Updated subnet: sub-test
root@45-59:/opt/stack/devstack# neutron subnet-show sub-test
+-------------------+------------------------------------------------+
| Field             | Value                                          |
+-------------------+------------------------------------------------+
| allocation_pools  | {"start": "100.0.0.100", "end": "100.0.0.200"} |
| cidr              | 100.0.0.0/24                                   |
| dns_nameservers   |                                                |
| enable_dhcp       | True                                           |
| gateway_ip        | 100.0.0.001    >>>ISSUE, should be 100.0.0.1                              |
| host_routes       |                                                |
| id                | 00dfe80b-911f-4cf1-8874-77639e6082c5           |
| ip_version        | 4                                              |
| ipv6_address_mode |                                                |
| ipv6_ra_mode      |                                                |
| name              | sub-test                                       |
| network_id        | 79292c3a-1c85-4014-b0d7-0f078f1a4ee8           |
| subnetpool_id     |                                                |
| tenant_id         | 71209fa21a7343e3b778ec5f4ff45252               |
+-------------------+------------------------------------------------+
root@45-59:/opt/stack/devstack# 

3) if update the gateway of subnet with needless "0" in the ip address
via dashboard, no this issue


[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/1524220

Title:
  can update the gateway of subnet with needless "0" in the ip address
  via cli

Status in neutron:
  New

Bug description:
  [Summary]
  can update the gateway of subnet with needless "0" in the ip address via cli

  [Topo]
  devstack all-in-one node

  [Description and expect result]
  if update the gateway of subnet with needless "0" in the ip address, the needless "0" can be cut off

  [Reproduceable or not]
  reproduceable 

  [Recreate Steps]
  1) create 1 subnet:
  root@45-59:/opt/stack/devstack# neutron subnet-show sub-test
  +-------------------+------------------------------------------------+
  | Field             | Value                                          |
  +-------------------+------------------------------------------------+
  | allocation_pools  | {"start": "100.0.0.100", "end": "100.0.0.200"} |
  | cidr              | 100.0.0.0/24                                   |
  | dns_nameservers   |                                                |
  | enable_dhcp       | True                                           |
  | gateway_ip        | 100.0.0.1                                      |
  | host_routes       |                                                |
  | id                | 00dfe80b-911f-4cf1-8874-77639e6082c5           |
  | ip_version        | 4                                              |
  | ipv6_address_mode |                                                |
  | ipv6_ra_mode      |                                                |
  | name              | sub-test                                       |
  | network_id        | 79292c3a-1c85-4014-b0d7-0f078f1a4ee8           |
  | subnetpool_id     |                                                |
  | tenant_id         | 71209fa21a7343e3b778ec5f4ff45252               |
  +-------------------+------------------------------------------------+

  2)update the gateway of subnet with needless "0" in the ip address:
  root@45-59:/opt/stack/devstack# neutron subnet-update  --gateway 100.0.0.001 sub-test
  Updated subnet: sub-test
  root@45-59:/opt/stack/devstack# neutron subnet-show sub-test
  +-------------------+------------------------------------------------+
  | Field             | Value                                          |
  +-------------------+------------------------------------------------+
  | allocation_pools  | {"start": "100.0.0.100", "end": "100.0.0.200"} |
  | cidr              | 100.0.0.0/24                                   |
  | dns_nameservers   |                                                |
  | enable_dhcp       | True                                           |
  | gateway_ip        | 100.0.0.001    >>>ISSUE, should be 100.0.0.1                              |
  | host_routes       |                                                |
  | id                | 00dfe80b-911f-4cf1-8874-77639e6082c5           |
  | ip_version        | 4                                              |
  | ipv6_address_mode |                                                |
  | ipv6_ra_mode      |                                                |
  | name              | sub-test                                       |
  | network_id        | 79292c3a-1c85-4014-b0d7-0f078f1a4ee8           |
  | subnetpool_id     |                                                |
  | tenant_id         | 71209fa21a7343e3b778ec5f4ff45252               |
  +-------------------+------------------------------------------------+
  root@45-59:/opt/stack/devstack# 

  3) if update the gateway of subnet with needless "0" in the ip address
  via dashboard, no this issue

  
  [Configration]
  reproduceable bug, no need

  [logs]
  reproduceable bug, no need

  [Root cause anlyze or debug inf]
  reproduceable bug

  [Attachment]
  None

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