Benefits of label stripping compared to label swapping from the point of node dimensioning

Abstract

All-Optical Label Swapping (AOLS) is a promising packet-switching technology to accomplish the gap between router forwarding speed and fibre transmission speed. The hardware requirements from the node however are unarguable a big disadvantage of these kinds of nodes. In this paper, we present two alloptical label switching nodes. One is based on the MPLS technology and one is an alternative switching strategy for packet-switching: label stripping. We compare both node architectures in terms of hardware requirements for different switching strategies and network parameters (such as topology and number of nodes).

MPLS Label Stacking on the Line Network

“…Increasing the stack size, increases also the total bandwidth consumption in the network. When the size of the stack is not limited, label stripping [7,8] encoding the whole path in the stack provides a feasible solution.…”

All-Optical Label Stacking: Easing the Trade-offs Between Routing and Architecture Cost in All-Optical Packet Switching

“…In this work we consider the distribution of labels in a per fiber basis, decreasing the chances of packet contentions [6].…”

“…(7) works similarly, but it concerns with paths merging. It differs from (6) in that the term φ y φ,α is added in order to avoid paying for those paths that have been covered. …”

“…In the case of label stacking, the four bits long labels yield to a header of 23 bits. Assuming a classical packet distribution (as in [6]), the average overhead caused in the traffic of the network is just 0.18% more due stacking.…”

All-Optical Label Stacking: Easing the Trade-offs Between Routing and Architecture Cost in All-Optical Packet Switching

“…An implementation of GMPLS forwarding functionalities using optical hardware is known as All-Optical Label Swapping (AOLS). However, AOLS designs do not scale well [6]. This is because each label the node recognizes needs an individual hardware [7].…”