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[Aggelos Kolaitis <1924237@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

## Description

We run OpenStack Ussuri and see the following errors repeatedly on
`neutron-server.log`:

```
2021-04-14 16:39:02.230 30704 ERROR neutron_lib.callbacks.manager [req-33c1014f-75c4-4306-96a8-927bb62f7f60 1718caa43bf24e7990cc09d5daa1fb85 46e94ce6568449209de022fa3bbbbae4 - 3dbb1c3c0fc54cc0b793ac49f841f103 3dbb1c3c0fc54cc0b793ac49f841f103] Error during notification for neutron_dynamic_routing.services.bgp.bgp_plugin.BgpPlugin.floatingip_update_callback--9223372036854663447 floatingip, after_update: TypeError: unsupported operand type(s) for +: 'int' and 'str'
2021-04-14 16:39:02.230 30704 ERROR neutron_lib.callbacks.manager Traceback (most recent call last):
2021-04-14 16:39:02.230 30704 ERROR neutron_lib.callbacks.manager   File "/usr/lib/python3/dist-packages/neutron_lib/callbacks/manager.py", line 197, in _notify_loop
2021-04-14 16:39:02.230 30704 ERROR neutron_lib.callbacks.manager     callback(resource, event, trigger, **kwargs)
2021-04-14 16:39:02.230 30704 ERROR neutron_lib.callbacks.manager   File "/usr/lib/python3/dist-packages/neutron_dynamic_routing/services/bgp/bgp_plugin.py", line 235, in floatingip_update_callback
2021-04-14 16:39:02.230 30704 ERROR neutron_lib.callbacks.manager     dest = floating_ip_address + '/32'
2021-04-14 16:39:02.230 30704 ERROR neutron_lib.callbacks.manager   File "/usr/lib/python3/dist-packages/netaddr/ip/__init__.py", line 426, in __add__
2021-04-14 16:39:02.230 30704 ERROR neutron_lib.callbacks.manager     new_value = int(self._value + num)
2021-04-14 16:39:02.230 30704 ERROR neutron_lib.callbacks.manager TypeError: unsupported operand type(s) for +: 'int' and 'str'
```

The error is caused by https://opendev.org/openstack/neutron-dynamic-
routing/src/branch/master/neutron_dynamic_routing/services/bgp/bgp_plugin.py#L235.

While debugging the issue, `floating_ip_address` was found to be a
netaddr.IPAddress object, so using + '/32' to add a suffix raises a
TypeError.

## Environment

OpenStack Ussuri

** Affects: neutron
     Importance: Undecided
         Status: In Progress

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https://bugs.launchpad.net/bugs/1924237

Title:
  TypeError when formating IP address for BGP plugin

Status in neutron:
  In Progress

Bug description:
  ## Description

  We run OpenStack Ussuri and see the following errors repeatedly on
  `neutron-server.log`:

  ```
  2021-04-14 16:39:02.230 30704 ERROR neutron_lib.callbacks.manager [req-33c1014f-75c4-4306-96a8-927bb62f7f60 1718caa43bf24e7990cc09d5daa1fb85 46e94ce6568449209de022fa3bbbbae4 - 3dbb1c3c0fc54cc0b793ac49f841f103 3dbb1c3c0fc54cc0b793ac49f841f103] Error during notification for neutron_dynamic_routing.services.bgp.bgp_plugin.BgpPlugin.floatingip_update_callback--9223372036854663447 floatingip, after_update: TypeError: unsupported operand type(s) for +: 'int' and 'str'
  2021-04-14 16:39:02.230 30704 ERROR neutron_lib.callbacks.manager Traceback (most recent call last):
  2021-04-14 16:39:02.230 30704 ERROR neutron_lib.callbacks.manager   File "/usr/lib/python3/dist-packages/neutron_lib/callbacks/manager.py", line 197, in _notify_loop
  2021-04-14 16:39:02.230 30704 ERROR neutron_lib.callbacks.manager     callback(resource, event, trigger, **kwargs)
  2021-04-14 16:39:02.230 30704 ERROR neutron_lib.callbacks.manager   File "/usr/lib/python3/dist-packages/neutron_dynamic_routing/services/bgp/bgp_plugin.py", line 235, in floatingip_update_callback
  2021-04-14 16:39:02.230 30704 ERROR neutron_lib.callbacks.manager     dest = floating_ip_address + '/32'
  2021-04-14 16:39:02.230 30704 ERROR neutron_lib.callbacks.manager   File "/usr/lib/python3/dist-packages/netaddr/ip/__init__.py", line 426, in __add__
  2021-04-14 16:39:02.230 30704 ERROR neutron_lib.callbacks.manager     new_value = int(self._value + num)
  2021-04-14 16:39:02.230 30704 ERROR neutron_lib.callbacks.manager TypeError: unsupported operand type(s) for +: 'int' and 'str'
  ```

  The error is caused by https://opendev.org/openstack/neutron-dynamic-
  routing/src/branch/master/neutron_dynamic_routing/services/bgp/bgp_plugin.py#L235.

  While debugging the issue, `floating_ip_address` was found to be a
  netaddr.IPAddress object, so using + '/32' to add a suffix raises a
  TypeError.

  ## Environment

  OpenStack Ussuri

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