A system includes a test controller configured for testing a device under test (DUT). Testing the DUT includes creating a link aggregation group (LAG) with the DUT, and the LAG includes a first link and a second link. The system includes a first traffic generator circuit including a first physical network port and a first port processor configured to transmit a first stream of test packets over the first link of the LAG. The system includes a second traffic generator circuit including a second physical network port and a second port processor configured to transmit a second stream of test packets over the second link of the LAG. The system is configured for instructing the first port processor to transmit both the first stream of test packets and the second stream of test packets on the first physical network port in response to detecting an anomaly on the second link.