I am testing a 3750ME switch as L2 device with iperf and Agilent router tester. I have a physical loop on 2 fastethernet ports - one port is access in vlan A and the other is access in vlan B. On the switch uplink both vlans are allowed. The test traffic comes from the uplink via vlan A, loops to vlan B via the physical loop and then goes back via vlan B through the uplink.
I have tested a lot of Cisco switches in this way and had no issues until now. Now I have 18 OutDiscards (Total output drops) on one of the fastethernet interfaces, connected via the physical loop.
The IOS is 12.2(44)SE1. I've read the release notes for this IOS, aka
where it says:
The Total- output-drops field in the show interfaces privileged EXEC command output now displays accurate ASIC drops.
so the counters are correct.
I generate less then 5Mbps duplex traffic, so the switch must not be overloaded.
Do you have any idea why I get these 18 output errors?