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peidan,lanw@cs.ucla.edu创新.PDF

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A Study of Packet Delivery Performance during Routing Convergence Dan Pei, Lan Wang Daniel Massey S. Felix Wu Lixia Zhang UCLA CSD USC/ISI UC Davis CSD UCLA CSD peidan, lanw @ masseyd@ wu@ lixia@ Technical Report TR-030051 UCLA Computer Science Department November 13th, 2003 Abstract applications depend on the Internet routing infrastructure for packet delivery service. In today’s Internet, routers for- Internet measurements have shown that networkfailur es ward data packets hop-by-hop towards their destinations happenfr equently, and that existing routing pr otocols can according to forwarding tables built by dynamic routing take multiple seconds, or even minutes, to converge after protocols such as BGP[23], OSPF[18], and RIP [15]. In afailur e. During these routing convergence periods, some [2] Paul Baran suggested that adequate redundancy in net- pac kets may already be en-route to their destinations and work connectivity combined with a dynamic routing pro- new pac kets may be sent. These in-ﬂight pac kets can en- tocol should enable data delivery even in the face of severe counter routing loops, delays, and losses. However, little component failures. is known about how many pac kets are delivered (or not de-