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How are the switches configured? It sounds like there is a network loop being created when both are connected and that is why it is dropping traffic if both are installed and work fine alone.
Thanks, Josh. That was my first assumption too. But this error is there when only one cable is connected. And furthemore the "farther" IOM which is NOT connected directly to the switching can be reached without a problem, no ping loss etc. Packet loss is at the directly connected IOM only.
[SWITCH] --- [IOM-A1] - [IOM-A2] :: A1 fails, A2 OK
[IOM-A1] - [IOM-A2] --- [SWITCH] :: A1 OK, A2 fails
[SWITCH] --- [IOM-A1] - [IOM-A2] --- [SWITCH] :: A1 fails, A2 fails
Switch is a stacked Dell 5000 series.
If you connect a laptop to that port does it have the same issue?