The Internet Engineering Task Force is standardizing the resource reservation protocol (RSVP) to reserve network resources over TCP/IP networks. End-to-end resource reservation with RSVP requires that RSVP is implemented in all nodes on the path. However, traffic control algorithms for resource reservation are complex in general, so it takes a long time for all nodes including end nodes to support them. Previously, it has been proposed that RSVP be used to guarantee sufficient bandwidth for a virtual private network over a TCP/IP network. The authors consider that the characteristics of traffic within a VPN are similar to the one outside a VPN, and consider only bandwidth as a major network resource parameter. Under these assumptions, the authors proposed a lightweight traffic control algorithm for bandwidth-guaranteed VPN and developed a router with this algorithm. This paper shows the results of an evaluation of this algorithm with pseudo-traffic generated by a specially designed traffic generator based on real traffic, and also shows that the bandwidth for VPN will be guaranteed in the normal VPN environment.
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