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[Jan Horstmann <1934912@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

With https://review.opendev.org/c/openstack/neutron/+/792791 neutron build from branch `stable/train` fails to update routers with ports containing an `allowed_address_pair` containing an IP address range in CIDR notation, i.e.:
```
openstack port show 135515bf-6cdf-45d7-affa-c775d2a43ce1 -f value -c allowed_address_pairs
[{'mac_address': 'fa:16:3e:1e:c4:f1', 'ip_address': '192.168.0.0/16'}]
```

I could not find definitive information on wether this is an allowed
value for allowed_address_pairs, but at least the openstack/magnum
project makes use of this.

Once the above is set neutron-l3-agent logs errors shown in
http://paste.openstack.org/show/807237/ and connection to all resources
behind the router stop.

Steps to reproduce:
Set up openstack environment with neutron build from git branch stable/train with OVS, DVR and router HA in a multinode deployment on ubuntu bionic.

Create a test environment:
openstack network create test
openstack subnet create --network test --subnet-range 10.0.0.0/24 test
openstack router create --ha --distributed test
openstack router set --external-gateway <provider network> test
openstack router add subnet test test
openstack server create --image <test image> --flavor m1.small --security-group <default> --network test test
openstack security group create icmp
openstack security group rule create --protocol icmp --ingress icmp
openstack server add security group test icmp
openstack floating ip create <provider network>
openstack server add floating ip test <floating ip>
ping <floating ip>
openstack port set --allowed-address ip-address=192.168.0.0/16 <instance port>
ping <floating ip>

Observe loss of ping after setting allowed_address_pairs.
Revert https://review.opendev.org/c/openstack/neutron/+/792791 and redeploy neutron
ping <floating ip>
Observe reestablishment of the connection.

Please let me know if you need any other information

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1934912

Title:
  Router update fails for ports with allowed_address_pairs containg IP
  range in CIDR  notation

Status in neutron:
  New

Bug description:
  With https://review.opendev.org/c/openstack/neutron/+/792791 neutron build from branch `stable/train` fails to update routers with ports containing an `allowed_address_pair` containing an IP address range in CIDR notation, i.e.:
  ```
  openstack port show 135515bf-6cdf-45d7-affa-c775d2a43ce1 -f value -c allowed_address_pairs
  [{'mac_address': 'fa:16:3e:1e:c4:f1', 'ip_address': '192.168.0.0/16'}]
  ```

  I could not find definitive information on wether this is an allowed
  value for allowed_address_pairs, but at least the openstack/magnum
  project makes use of this.

  Once the above is set neutron-l3-agent logs errors shown in
  http://paste.openstack.org/show/807237/ and connection to all
  resources behind the router stop.

  Steps to reproduce:
  Set up openstack environment with neutron build from git branch stable/train with OVS, DVR and router HA in a multinode deployment on ubuntu bionic.

  Create a test environment:
  openstack network create test
  openstack subnet create --network test --subnet-range 10.0.0.0/24 test
  openstack router create --ha --distributed test
  openstack router set --external-gateway <provider network> test
  openstack router add subnet test test
  openstack server create --image <test image> --flavor m1.small --security-group <default> --network test test
  openstack security group create icmp
  openstack security group rule create --protocol icmp --ingress icmp
  openstack server add security group test icmp
  openstack floating ip create <provider network>
  openstack server add floating ip test <floating ip>
  ping <floating ip>
  openstack port set --allowed-address ip-address=192.168.0.0/16 <instance port>
  ping <floating ip>

  Observe loss of ping after setting allowed_address_pairs.
  Revert https://review.opendev.org/c/openstack/neutron/+/792791 and redeploy neutron
  ping <floating ip>
  Observe reestablishment of the connection.

  Please let me know if you need any other information

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