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CAIA Technical Report 031217A December 2003 Page 3 of 5

Figure 2: Cumulative packets vs time all start options (first 32,000 packets)

Figure 3: Initial packet bursts

Figure 4 shows a sample of packets burst using the

Group option during a gradient change. We can see that

before the gradient change occurs there are bursts of four

packets and that the gradient change is caused by the

tcpdump only receiving two packets per burst from the

switch.

Figure 5 shows the cumulative packets versus

cumulative time for the four individual source cards in

the Group option test. We can see that the switch mainly

dropped packets from card 4 with tcpdump only

capturing 9,021 packets. Tcpdump captured 10,000

packets from card 2, 9,918 packets from card 1 and

9,775 packets from card 3. Figure 6 shows part of Figure

5, were some packet loss occured. These steps are

caused by times when tcpdump was not recording four

packets per burst as packet loss occured.

Figure 4: Gradient change in Group option

Figure 5: Group test individual card packet capture

Figure 6: Gradient change due to packet loss in the Group test

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Alloy NS-16T Manual de usuario Pagina 3