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Ethernet network interface problems (CNAs only)
Use the following information to isolate problems that are more specific to CNA function.
NOTE
Switch command examples used in this section are for the Brocade 8000 Switch.
Ethernet loopback test problems
Errors occur during BCU Ethernet loopback tests.
1. Symptom: Loopback test returns "Check link/cable or SFP" error when executed with -t cable
2. Symptom: Loopback test returns a "port not disabled" error.
3. Symptom: Loopback test returns a "port not disabled" error. The error.displays even after
4. Symptom: The loopback test returns "Device busy - Retry operation" or "diag busy."
5. Symptom: The loopback test returns "Missing frame check and replace SFP/cable".
Brocade Adapters Troubleshooting Guide
53-1001582-01
option (.
Possible Cause: Loopback cable not inserted in tested port.
Action: Verify that loopback cable is securely inserted in the port that you are testing.
Possible Cause: Port is enabled.
Action: Disable the port using the port --disable BCU command before running loopback test.
disabling the port.
Possible Cause: Network load balancing service is enabled. This will cause the adapter to
disable and enable, and the previously configured state (port disable) is lost.
Action: Disable network load balancing and retest.
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, and
Task Manager for Windows systems.
Action: If instances are still running, wait a few minutes, then again check if the tests done
using the ps -ef command or Task Manager.
Possible Cause: The loopback cable was pulled during the test and the test is run in external
mode (not serdes mode).
Action: Restart the test with the cable connected.
Ethernet network interface problems (CNAs only)
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Troubleshooting
