SO003_11: Update field description

src/definitions/SOL002SOL003_def.yaml

@@ -600,7 +600,17 @@ definitions:
         description: >
           Externally provided link ports to be used to connect external
           connection points to this external VL. If this attribute is not
-          present, the VNFM shall create the link ports on the external VL.
+          present, the VNFM shall create the link ports on the external VL
+          unless the extCp exposes a VIP CP and a link port is not needed
+          for it based on the conditions defined below.
+          A link port is not needed for an external CP instance that exposes a VIP CP in the following cases:
+          1	For a VIP CP directly exposed as extCP:
+            1.1	No dedicated IP address is allocated as VIP address, as indicated in the VNFD.
+            1.2	A dedicated IP address is allocated as VIP address, but the NFVO indicates that no
+            port is needed (createExtLinkPort in VnfExtCpConfig set to false).
+          2	For a VIP CP exposed as extCP via a floating IP address:
+            2.1	No dedicated IP address is allocated as VIP address, as indicated in the VNFD, and
+            the VNFC CP associated to the VIP CP is also exposed via a floating IP address.
         type: array
         items:
           $ref: "#/definitions/ExtLinkPortData"