32 Brocade Adapters Troubleshooting Guide53-1002145-01Network interface problems (CNA or NIC)2Network interface problems (CNA or NIC)Use the following information to isolate problems that are more specific to the function of a CNA orFabric Adapter port configured in CNA or NIC mode. For additional information on troubleshootingproblems on mezzanine and expansion card adapters, refer to “Troubleshooting mezzanine cardproblems” on page 55.NOTESwitch command examples used in this section are for the Brocade 8000 Switch.Ethernet loopback test problemsErrors occur during BCU Ethernet loopback tests.1. Symptom: Loopback test returns “Check link/cable or SFP” error when executed with -t cableoption (stand-up adapters only).Possible Cause: Loopback cable not inserted in tested port.Action: Verify that loopback cable is securely inserted in the port that you are testing.2. Symptom: Loopback test returns a “port not disabled” error.Possible Cause: Port is enabled.Action: Disable the port using the port --disable BCU command before running loopback test.3. Symptom: Loopback test returns a “port not disabled” error. The error.displays even afterdisabling the port.Possible Cause: Network load balancing service is enabled. This will cause the adapter todisable and enable, and the previously configured state (port disable) is lost.Action: Disable network load balancing and retest.4. Symptom: The loopback test returns “Device busy - Retry operation” or “diag busy.”Possible Cause: Other users or sessions are running another instance of loopback tests.Action: Check if instances of this diagnostic are running using ps -ef for Linux and VMware, andTask Manager for Windows systems.Action: If instances are still running, wait a few minutes, then again check if the tests doneusing the ps -ef command or Task Manager.5. Symptom: The loopback test returns “Missing frame check and replace SFP/cable” (stand upcards only).Possible Cause: The loopback cable was pulled during the test and the test is run in externalmode (not serdes mode).Action: Restart the test with the cable connected.
