UDP Total Paket counter ? and Lost Counter
Hi,
Here is my lab:
Pc1-----Switch A ----- Switch B ---- Pc2.
I generate between Pc1 and Pc2 a stream of UDP at 6Mb/s. It means an average
of 1100 packets under normal circumstances.
Between Switch A and Switch B, i bundle two GigE interface. I want to check
the behavior of switches when i remove one of the GigE link.
[ 3] 142.0-144.1 sec 1.5 MBytes 6.2 Mbits/sec 6.713 ms 0/ 1089 (0%)
[ 3] 144.1-146.0 sec 1.5 MBytes 6.4 Mbits/sec 2.348 ms 0/ 1056 (0%)
[ 3] 146.0-148.1 sec 1.5 MBytes 6.2 Mbits/sec 0.049 ms 0/ 1090 (0%)
[ 3] 148.1-150.1 sec 1.5 MBytes 6.3 Mbits/sec 6.013 ms 0/ 1075 (0%)
[ 3] 150.1-152.1 sec 1.6 MBytes 6.6 Mbits/sec 5.988 ms 0/ 1118 (0%)
[ 3] 152.1-154.0 sec 1.5 MBytes 6.6 Mbits/sec 0.365 ms 0/ 1088 (0%)
[ 3] 154.0-156.1 sec 1.5 MBytes 6.0 Mbits/sec 5.995 ms 0/ 1054 (0%)
[ 3] 156.1-158.0 sec 1.5 MBytes 6.7 Mbits/sec 0.348 ms 0/ 1090 (0%)
[ 3] 158.0-160.1 sec 1.5 MBytes 6.2 Mbits/sec 0.010 ms 0/ 1091 (0%)
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
>>>>>>>>>>>>>>>I remove on GigE Link
[ 3] 160.1-162.8 sec 998 KBytes 3.0 Mbits/sec 6.256 ms 769/ 1464
(53%)
>>>>>>>>Normal reaction, the switch reroutes the traffic to the other GigE
>>>>>>>>link
[ 3] 162.8-164.1 sec 989 KBytes 6.2 Mbits/sec 0.013 ms 0/ 689 (0%)
>>>>>>>>>>Why is there a difference ? How does iperf computes the total
>>>>>>>>>>Datagrams ? and lost datagrams
[ 3] 164.1-166.1 sec 1.5 MBytes 6.3 Mbits/sec 6.002 ms 0/ 1076 (0%)
[ 3] 166.1-168.1 sec 1.6 MBytes 6.6 Mbits/sec 5.980 ms 0/ 1117 (0%)
[ 3] 168.1-170.1 sec 1.4 MBytes 6.0 Mbits/sec 6.017 ms 0/ 1025 (0%)
[ 3] 170.1-172.0 sec 1.5 MBytes 6.6 Mbits/sec 4.766 ms 0/ 1083 (0%)
regards
Ced