diff --git a/environments/external-network-vip.yaml b/environments/external-network-vip.yaml
new file mode 100644
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+++ b/environments/external-network-vip.yaml
@@ -0,0 +1,5 @@
+# This environment allows us to control the external VIP for Undercloud or Standalone SSL.
+# When used, a network data has to be provided (e.g. network_data_undercloud.yaml) and
+# `openstack tripleo deploy` must be called with --public-virtual-ip.
+resource_registry:
+  OS::TripleO::Network::Ports::ExternalVipPort: ../network/ports/external_from_pool.yaml