diff --git a/neutron_lib/placement/constants.py b/neutron_lib/placement/constants.py
index bbf11c605..c07c27609 100644
--- a/neutron_lib/placement/constants.py
+++ b/neutron_lib/placement/constants.py
@@ -27,3 +27,7 @@ INVENTORY_OPTIONS = set([
     'reserved',
     'step_size',
     ])
+
+# Tunnelled networks resource provider default name.
+RP_TUNNELLED = 'rp_tunnelled'
+TRAIT_NETWORK_TUNNEL = 'CUSTOM_NETWORK_TUNNEL_PROVIDER'
diff --git a/releasenotes/notes/add-placement-constants-tunnelled-networks-b57eb88fed14791b.yaml b/releasenotes/notes/add-placement-constants-tunnelled-networks-b57eb88fed14791b.yaml
new file mode 100644
index 000000000..82f05b643
--- /dev/null
+++ b/releasenotes/notes/add-placement-constants-tunnelled-networks-b57eb88fed14791b.yaml
@@ -0,0 +1,5 @@
+---
+features:
+  - |
+    Added two constants to model tunnelled networks in the Placement
+    API: ``RP_TUNNELLED`` and ``TRAIT_NETWORK_TUNNEL``.