Comparison of Packet-Switching and Label-Switching for Routing in VPN-based Networks

Nader F. Mir, Devang K. Doshi, and Maulik B. Gandhi


Label Switching, VPNs, IPv4, Routing in Computer Networks


The contribution of this paper is to study Virtual Private Networks (VPNs) and compare them under two different types of conditions. One type of VPNs is supported by regular Internet Protocol version 4 (IPv4) and the other type by multi-protocol label switching (MPLS). The comparison will be in terms of CPU and bandwidth usage. We will show that MPLS is a better choice compared with IPv4 in terms of packet processing capability and bandwidth usage. We will show that MPLS technology is scalable in terms of CPU processing and bandwidth usage. The MPLS and IPv4 VPNs are simulated over the NS2. The comparison is made between MPLS and IPv4 networks in terms of bandwidth usage by applying routing protocol details and CPU usage for each technology. Various network performance parameters are compared with the help of trace file generated from the simulations of the MPLS and IP networks. The project achieved far better results for MPLS when compared to IPv4 network.

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