diff --git a/xos/synchronizer/models/fabric.xproto b/xos/synchronizer/models/fabric.xproto
index 71ad3ee..95c4539 100644
--- a/xos/synchronizer/models/fabric.xproto
+++ b/xos/synchronizer/models/fabric.xproto
@@ -32,6 +32,14 @@
 
     required manytoone port->SwitchPort:interfaces = 1 [help_text = "The fabric switch port the interface belongs to", db_index = True, null = False, blank = False];
     required string name = 2 [help_text = "The unique name of the fabric switch port", max_length = 254, null = False, db_index = False, blank = False];
-    required string ips = 3 [help_text = "The interface IP address (xxx.yyy.www.zzz/nm)", max_length = 20, null = False, db_index = False, blank = False];
+    required string ips = 3 [help_text = "The interface IP address (xxx.yyy.www.zzz/nm)", max_length = 20, null = False, db_index = False, blank = False, unique_with = "port"];
     optional int32 vlanUntagged = 4 [help_text = "The optional untagged VLAN ID for the interface", max_length = 20, null = True, db_index = False, blank = True];
+}
+
+message NodeToSwitchPort(XOSBase) {
+    option verbose_name = "Node to switch port";
+    option description = "Compute Node connection to a Fabric switch port";
+
+    required manytoone port->SwitchPort:node_to_switch_ports = 1 [help_text = "The fabric switch port the node is connected to", db_index = True, null = False, blank = False, tosca_key=True];
+    required manytoone node->Node:node_to_switch_ports = 2 [help_text = "The ComputeNode this port is connected to", db_index = True, null = False, blank = False, tosca_key=True];
 }
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