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Label switching technology enables high performance, flexible, layer-3 packet forwarding based on the fixed length label information mapped to the layer-3 packet stream. A Label Switching Router (LSR) forwards layer-3 packets based on their label information mapped to the layer-3 address information as well as their layer-3 address information. This paper evaluates the required number of labels under traffic-driven label mapping policy using the real backbone traffic traces. The evaluation shows that the label mapping policy requires a large number of labels. In order to reduce the required number of labels, we propose a label mapping policy which is a traffic-driven label mapping for the traffic toward the same destination network. The evaluation shows that the proposed label mapping policy requires only about one tenth as many labels compared with the traffic-driven label mapping for the host-pair packet stream,and the topology-driven label mapping for the destination network packet stream.© (1998) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

Architecture overview of cell switch router (CSR), that is one of actual implementation using label switching paradigm, and the CSR prototype system supporting standard ATM interfaces are described. CSR can operate both with PVC (permanent virtual connection) and with SVC (switched virtual connection) as the VC for cut-through packet forwarding. CSR contains cell switch fabric and IP packet switch fabric to achieve high throughput IP forwarding. IP packets are forwarded either through a cut-through packet transmission, in which packet are forwarded without reassembling IP packet nor IP header processing, or through a conventional hop-by-hop IP packet forwarding. This paper describes and proposes the mechanism to forward the connectionless IP packet flows at the CSR. A CSR prototype system has developed. The CSR prototype system uses PVC and SVC connections to transfer the IP packets. With the CSR prototype system, we can make sure that CSR system could establish the cut-through packet transmission path between the adjacent node with acceptable establishment delay, that was less than few hundred second. The SVC connections for cut- through packet transmission are established on demand using ATM Forum UNI 3.0 or UNI 3.1.