12-28-2010
using multiple iperf instances
Hi ppucci,
Multiple iperf instances would work for what you want. I'm assuming that you're using VLAN sub-interfaces (e.g. eth0.1234) since you mentioned 802.1q trunking to your interface.
On the recieve (server) side you can run a single iperf instances that will bind to all interfaces (this is the normal 'iperf -s' behavior), or exec multiple iperf servers, each using -B to bind to a specific interface (for finer-grained logging and control) as pileofrogs mentioned.
To state the obvious: your 20 iperf streams will each be ~50Mbit; This may be fine for switch testing, but mentioning in case your trying to e.g. saturate a multiple port Gigabit switch fabric.
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