A packet transfer scheme that applies markings at different levels to packets while they are transferred from their source to destination, in which a marking information at one level will not be lost by a marking at another level is disclosed. A node device receives packets each having a plurality of...http://www.google.de/patents/US6501760?utm_source=gb-gplus-sharePatent US6501760 - Node device and packet transfer method using priority information in plural hierarchical levels
