This read-create INTEGER selects the priority (ef-guaranteed, ef, af1-af4, or be) with which traffic matched on this specific virtual interface is sent out, narrower in scope than the VR-level version. An admin sets this per interface when different links under the same VR need different forwarding priority. Assigning be(7) to a best-effort customer interface, while another interface on the same VR uses ef(2), lets the two customers get distinctly different treatment.