The new PIM-SM IPFRR mechanism

摘要

The IPFRR technology provides fast network recovery after a link or router failure within an ISP network. During the link or the router failure within network, there is unpredictable period of time when part of communication is lost until the process of network convergence will complete. During this process specific networks may become unavailable and problems with critical applications and services, such as the Voice over IP, might occur. The significance of IPFRR mechanism in the existing IP networks is very important, and the future of IPFRR technology is very promising. Most of existing IPFRR mechanisms require pre-computation of alternative backup routes for case of specific failures of links or routers within the ISP network. In this paper we present a new IPFRR mechanism, which utilizes common multicast protocol Protocol Independent Multicast - Sparse Mode (PIM-SM). This new PIM-SM IPFRR mechanism is designed to protect specific unicast flows.