This attribute identifies a user group session to which the specified policy criteria is to be applied. The identified user group session must exist in the User Role Table for the policy installation to succeed. This attribute is thus used to synchronize state for user-based policies. The attribute ntnQosUserRoleSessionGroup in the User Role Table identifies current (i.e., applicable) user group sessions. Furthermore, the specified qosTargetInterfaceRoles role combination identifies a user role (and not an interface role) when the value of this attribute is non-zero. A value of zero for this attribute indicates that the policy is not to be applied to a specific set of users. In this case, policy is applied based on the standard interface-to-role associations specified in the ntnQosInterfaceIdTable.