frame-relay de-list list-number {protocol protocol | interface interface-type interface-number} characteristic -- > Define a DE list.
You can specify DE lists based on the protocol or the interface, and on characteristics such as fragmentation of the packet, a specific Transmission Control Protocol (TCP) or User Datagram Protocol (UDP) port, an access list number, or a packet size. See the frame-relay de-list command in the Wide-Area Networking Command Reference for arguments and other information.
http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/12cgcr/qos_c/qcpart4/qcfrts.htm
