Multiplex communications – Diagnostic testing
Reexamination Certificate
2008-05-27
2008-05-27
Nguyen, Brian (Department: 2616)
Multiplex communications
Diagnostic testing
C370S254000
Reexamination Certificate
active
07379426
ABSTRACT:
A routing loop detection program that controls a computer to be operated as equipment including a counter that counts the number of packets whose IP header includes the hop number for each of all the possible hop numbers when a packet capture device connected to a network acquires all packets captured within a predetermined period, a discriminator that discriminates whether a flat portion or a sawtooth portion exists in a histogram based on the number of packets for the respective hop numbers counted by the counter, and an output portion that notifies a sign of occurrence of routing loop when the discriminator discriminated that the histogram has the flat portion or the sawtooth portion.
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Urs Hengartner et al. “Detection and Analysis of Routing Loops in Packet Traces”, Sprint ATL Technical TRO2-ATL-051001, May 2002.
Craig Labovitz et al., “Delayed Internet Routing Convergence”; Copyright 2000 ACM 1-58113-224-7/00/0008, pp. 175-187.
Fujitsu Limited
Nguyen Brian
Staas & Halsey , LLP
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