Some other switches will turn the loop back cable into a redundant link. Newer switches usually have built in loop back protection, whereby they will disable a port if it suspects a loop back. To run this test with the Phoronix Test Suite, the basic command is: phoronix-test-suite benchmark network-loopback. This issue tends to affect older infrastructure only. Loopback TCP Network Performance This test measures the loopback network adapter performance using a micro-benchmark to measure the TCP performance. Are there a group of lights flashing repeatedly and in time with each other? The odd group flash can be ignored, but a constant group of lights flashing together is worth investigating. It can also be useful to observe the activity lights on the switch as well. If you have managed network switches, the diagnostic section of the web interface may give an insight into a loop back situation and highlight the offending ports. Have any wall ports been activated? Have any new switches or hubs been added to the network? Examine the cabling and look for any cables with both ends plugged into a switch. Review any changes made to the network recently. This results in broadcast data getting looped through the switch(es) and holding back genuine data transfers by eating up a huge amount of bandwidth. If a network patch cable has both ends inserted into either the same switch or a neighbouring switch that's part of the same LAN, you can create what's called a loop back. You may also receive timeout errors when trying to access network resources. This can be signified by excessive logon times, slow access via mapped drives and poor Internet performance. You may experience degraded performance on your local area network. Network performance can be severely impacted by the introduction of a network loop. Loop back causing poor performance on local area network
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