CLI command to see interface errors, stats, etc

Hi, I am running a 60B with Fortigate-60B 3.00-b0744(MR7 Patch 6). I am trying to connect the unit in front of a RiverBed Steelhead 550 device for WAN Optimization. I have the interface setting on both the 60B and the Riverbed set to 100 mb/ Full Duplex. However, the Riverbed device is complaining about Duplex errors on the interface that connects to the Fortigate. How can I show a status on the 60B that will show me any types of RX/TX errors, etc? and what the specific duplex running actually is, because the GUI shows the port as being 100 Mbps / Full Duplex, but I' ve heard that may not always be totally accurate. I ran the command below to force the switch speeds to be 100Full: #> config system global #> set internal-switch-speed 100full just want to see if i can troubleshoot better what is happening on the Fortigate interfaces. thanks james