Comment 3 for bug 1998952

Hello:

This documentation is present in the neutron-lib API reference: https://docs.openstack.org/api-ref/network/v2/#routers-routers. There is a warning message that warns about the issue described in this bug:

"""
By default in a router there is one route for each attached subnet. If you add an extra route that matches one of the default routes for a subnet, the existing subnet route will be overwritten. If the Neutron route is removed, the corresponding route will be removed as well. The affected subnet will subsequently lose connectivity to this router.
"""

Regards.