show nettest

cable-swap	Displays the results of the cable swap test. If the test fails, ensure you are not using a straight-through cable between an appliance port and a router, or a crossover cable between an appliance port and a switch.
duplex	Displays the results of the duplex matching test. If one side is different from the other, then traffic is sent at different rates on each side, causing a great deal of collision.
ip-port-reach	Displays the results of the IP port reachability test.
net-gateway	Displays the results of the network gateway test.
peer-reach	Displays the results of the peer reachability test.