Performance Analysis for QoS Provisioning in MPLS Networks

LSR(Label Switching Router)s in MPLS (Multiprotocol Label Switching) networks map arriving IP flows into some labels on Layer 2 switching fabric and establish LSP(Label Switching Path)s. By using LSPs, LSRs can not only transmit IP packets fast with cut-through mechanism, but also solve traffic engineering issue to maximize resource utilization in the whole MPLS networks. So far, we have analyzed delay performance of LSR by focusing only on the real time traffic transmission. In this paper, we will consider the case where non-real time traffic arrives at LSR as well as real time traffic and analyze those packet loss rate under the assumption that the cut-through transmission is applied only to real time traffic. Furthermore, we discuss the bandwidth allocation policy and the buffer dimensioning to meet the requirement with respect to both delay for real time traffic and loss probability for non-real time one, and show the guide for QoS provisioning in MPLS networks.