Performance analysis of IP datagram transmission delay in MPLS:impact of both the number and the bandwidth of LSPs of layer 2

摘要

LSR (label switching router)s in MPLS (multiprotocol labelswitching) networks map arriving IP flows into some labels on the layer2 switching fabric and establish LSP (label switching path)s. By usingLSPs, LSRs not only transmit IP datagrams fast with a cut-throughmechanism, but also solve the traffic engineering issue to optimize thedelay of some IP datagram flows. So far, we have analyzed theperformance of LSR focusing only on the maximum number of LSPs which canbe set on layer 2. We also consider the bandwidth allocated to each LSPand analyze the IP datagram transmission delay and the cut-through rateof LSR. We suppose the label mapping method as the data-driven scheme inthe analytical model, so that the physical bandwidth of LSR is shared byboth the default LSP for hop-by-hop transmission and the cut-throughLSPs. Thus, we investigate the impact of the bandwidth allocation amongthese LSPs on the performance