Comment 1 for bug 1963908

(undercloud) [stack@wallabyuc8 ~]$ openstack network show ctlplane
+---------------------------+--------------------------------------------------------------------+
| Field | Value |
+---------------------------+--------------------------------------------------------------------+
| name | ctlplane |
| tags | tripleo_net_idx=0, tripleo_network_name=ctlplane, tripleo_vip=true |

The issue here is the tag's on the ctlplane network is incorrect.
The tags on the ctlplane network should be a list of CIDR's, one entry for each subnet on the ctlplane network.

These are set here: https://opendev.org/openstack/tripleo-heat-templates/src/branch/master/extraconfig/post_deploy/undercloud_ctlplane_network.py#L359-L361

I'm not sure how one can end up with different values.