The value of vRtrIfQosNetworkPolicyId associates a pre-existing network-policy-id to a network interface. Packets are marked using qos policies on edge switches; invoking a qos policy on a network port allows for the packets that match the policy criteria to be remarked. If this entry indicates a service virtual router interface or the special out-of-band management interface, this object is meaningless and is not applied to the interface.
Sources for this description
Nokia networking MIB copies (LibreNMS/Observium Community)