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Inside vBRG you can also check the status with 'vppctl show int'. If vpp works properly, you should be able to see that both tap-0 and tap-1 in 'up' state. An example is below.
Unable to change subnet name
When running "vcpe.py infra" command, if you see error message about subnet can't be found. It may be because your python-openstackclient is not the latest version and don't support "openstack subnet set --name" command option. Upgrade the module with "pip install --upgrade python-openstackclient".