diff --git a/python/neutron-understack/neutron_understack/neutron_understack_mech.py b/python/neutron-understack/neutron_understack/neutron_understack_mech.py
index d7ce95ce9..aa9263bc9 100644
--- a/python/neutron-understack/neutron_understack/neutron_understack_mech.py
+++ b/python/neutron-understack/neutron_understack/neutron_understack_mech.py
@@ -115,16 +115,18 @@ def _update_port_baremetal(self, context: PortContext) -> None:
         current_vif_other = context.vif_type == portbindings.VIF_TYPE_OTHER
 
         if current_vif_unbound and original_vif_other:
-            local_link_info = utils.local_link_from_binding_profile(
-                context.original[portbindings.PROFILE]
-            )
+            port = context.original
         else:
+            port = context.current
+
+        vlan_group_name = port[portbindings.PROFILE].get("physical_network")
+        if vlan_group_name is None:
             local_link_info = utils.local_link_from_binding_profile(
-                context.current[portbindings.PROFILE]
+                port[portbindings.PROFILE]
+            )
+            vlan_group_name = self.ironic_client.baremetal_port_physical_network(
+                local_link_info
             )
-        vlan_group_name = self.ironic_client.baremetal_port_physical_network(
-            local_link_info
-        )
 
         if current_vif_unbound and original_vif_other:
             self._tenant_network_port_cleanup(context)
@@ -178,14 +180,18 @@ def _delete_port_baremetal(self, context: PortContext) -> None:
         # Only clean up provisioning ports. Ports with tenant networks are cleaned
         # up in _tenant_network_port_cleanup
 
-        local_link_info = utils.local_link_from_binding_profile(
-            context.current[portbindings.PROFILE]
-        )
-        vlan_group_name = self.ironic_client.baremetal_port_physical_network(
-            local_link_info
-        )
+        port = context.current
 
-        if vlan_group_name and is_provisioning_network(context.current["network_id"]):
+        vlan_group_name = port[portbindings.PROFILE].get("physical_network")
+        if vlan_group_name is None:
+            local_link_info = utils.local_link_from_binding_profile(
+                port[portbindings.PROFILE]
+            )
+            vlan_group_name = self.ironic_client.baremetal_port_physical_network(
+                local_link_info
+            )
+
+        if vlan_group_name and is_provisioning_network(port["network_id"]):
             # Signals end of the provisioning / cleaning cycle, so we
             # put the port back to its normal tenant mode:
             self.invoke_undersync(vlan_group_name)
@@ -232,12 +238,16 @@ def _bind_port_segment(self, context: PortContext, segment):
         network_id = context.current["network_id"]
         mac_address = context.current["mac_address"]
 
-        local_link_info = utils.local_link_from_binding_profile(
-            context.current[portbindings.PROFILE]
-        )
-        vlan_group_name = self.ironic_client.baremetal_port_physical_network(
-            local_link_info
-        )
+        port = context.current
+
+        vlan_group_name = port[portbindings.PROFILE].get("physical_network")
+        if vlan_group_name is None:
+            local_link_info = utils.local_link_from_binding_profile(
+                port[portbindings.PROFILE]
+            )
+            vlan_group_name = self.ironic_client.baremetal_port_physical_network(
+                local_link_info
+            )
 
         if not vlan_group_name:
             LOG.error(
diff --git a/python/neutron-understack/neutron_understack/trunk.py b/python/neutron-understack/neutron_understack/trunk.py
index 716f59e15..395a6186c 100644
--- a/python/neutron-understack/neutron_understack/trunk.py
+++ b/python/neutron-understack/neutron_understack/trunk.py
@@ -181,10 +181,12 @@ def _add_subports_networks_to_parent_port_switchport(
         binding_profile = parent_port.bindings[0].profile
         binding_host = parent_port.bindings[0].host
 
-        local_link_info = utils.local_link_from_binding_profile(binding_profile)
-        vlan_group_name = self.ironic_client.baremetal_port_physical_network(
-            local_link_info
-        )
+        vlan_group_name = binding_profile.get("physical_network")
+        if vlan_group_name is None:
+            local_link_info = utils.local_link_from_binding_profile(binding_profile)
+            vlan_group_name = self.ironic_client.baremetal_port_physical_network(
+                local_link_info
+            )
 
         self._handle_segment_allocation(subports, vlan_group_name, binding_host)
 
@@ -207,10 +209,13 @@ def _clean_parent_port_switchport_config(
             return
         binding_profile = parent_port_obj.bindings[0].profile
         binding_host = parent_port_obj.bindings[0].host
-        local_link_info = utils.local_link_from_binding_profile(binding_profile)
-        vlan_group_name = self.ironic_client.baremetal_port_physical_network(
-            local_link_info
-        )
+
+        vlan_group_name = binding_profile.get("physical_network")
+        if vlan_group_name is None:
+            local_link_info = utils.local_link_from_binding_profile(binding_profile)
+            vlan_group_name = self.ironic_client.baremetal_port_physical_network(
+                local_link_info
+            )
         self._handle_subports_removal(
             binding_profile=binding_profile,
             binding_host=binding_host,
@@ -265,10 +270,12 @@ def subports_added_post(self, resource, event, trunk_plugin, payload):
 
         if utils.parent_port_is_bound(parent_port):
             binding_profile = parent_port.bindings[0].profile
-            local_link_info = utils.local_link_from_binding_profile(binding_profile)
-            vlan_group_name = self.ironic_client.baremetal_port_physical_network(
-                local_link_info
-            )
+            vlan_group_name = binding_profile.get("physical_network")
+            if vlan_group_name is None:
+                local_link_info = utils.local_link_from_binding_profile(binding_profile)
+                vlan_group_name = self.ironic_client.baremetal_port_physical_network(
+                    local_link_info
+                )
             LOG.debug("subports_added_post found vlan_group_name=%s", vlan_group_name)
             self._trigger_undersync(vlan_group_name)