Nope, the system doesn't appear busy at all.
Nicstat while it's idle:
#./nicstat.SunOS_i386 -i nge0 1 60
Time Int rKB/s wKB/s rPk/s wPk/s rAvs wAvs %Util Sat
12:59:59 nge0 407.8 593.3 496.7 558.8 840.7 1087.3 0.82 0.00
13:00:00 nge0 173.5 6.35 124.9 65.96 1422.4 98.55 0.15 0.00
13:00:01 nge0 118.8 4.46 88.00 47.00 1381.9 97.15 0.10 0.00
13:00:02 nge0 186.1 6.95 131.0 72.00 1454.5 98.78 0.16 0.00
13:00:03 nge0 141.9 8.16 102.0 62.00 1424.9 134.8 0.12 0.00
13:00:04 nge0 163.8 10.01 127.0 77.00 1320.7 133.1 0.14 0.00
13:00:05 nge0 116.7 6.95 88.00 54.00 1358.4 131.8 0.10 0.00
13:00:06 nge0 82.44 5.08 67.00 38.00 1259.9 136.8 0.07 0.00
13:00:07 nge0 59.32 4.19 47.00 29.00 1292.3 147.9 0.05 0.00
13:00:08 nge0 150.9 8.71 110.0 67.00 1404.6 133.1 0.13 0.00
And nicstat while a copy is taking place (and peaking at 10MB/s)
# ./nicstat.SunOS_i386 -i nge0 1 60
Time Int rKB/s wKB/s rPk/s wPk/s rAvs wAvs %Util Sat
13:01:02 nge0 407.8 593.3 496.7 558.7 840.7 1087.3 0.82 0.00
13:01:03 nge0 148.7 10117.9 1048.1 6879.9 145.3 1505.9 8.41 0.00
13:01:04 nge0 356.9 9003.4 1098.0 6215.1 332.8 1483.4 7.67 0.00
13:01:05 nge0 112.2 9944.2 1009.0 6750.0 113.9 1508.6 8.24 0.00
13:01:06 nge0 55.35 9687.2 941.0 6552.9 60.23 1513.8 7.98 0.00
13:01:07 nge0 61.80 10103.0 983.0 6836.1 64.38 1513.4 8.33 0.00
13:01:08 nge0 263.8 11112.3 1225.0 7600.9 220.5 1497.1 9.32 0.00
13:01:09 nge0 122.5 11098.8 1121.0 7529.1 111.9 1509.5 9.19 0.00
13:01:10 nge0 123.0 11150.7 1123.0 7564.9 112.1 1509.4 9.24 0.00
9% usage. Exactly what our switch said.
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