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90 Brocade Adapters Troubleshooting Guide53-1002145-01Diagnostics3Use the fcdiag --linkbeacon command to enable end-to-end beaconing.fcdiag --linkbeacon {on | off}where:port_id ID of the port for which you want to run a link beacon test. This could be thePWWN, port hardware path, or user-specified port name. This could also bethe adapter-index/port-index. For example, to specify adapter 1, port 1, youwould use 1/1 as the port identification.on | off Toggle on or off. If turned on, you can specify duration.Enabling beaconing through HCMEnable link and port beaconing using the following steps.1. Launch the HCM.2. Select the base adapter port from the device tree window.3. Click Configure > Beacon.4. Click the Link check box, the Port check box, or both.Internal and external loopback testsUse the BCU or the HCM to perform a loopback test for a specific port. Loopback tests require thatyou disable the port. The following loopback tests are available:• InternalRandom data patterns are sent to the adapter port, then returned without transmitting throughthe port. The returned data is validated to determine port operation. Errors may indicate afailed port.• ExternalFor this test, a loopback connector is required for the port. For mezzanine or expansion cardadapters, this test can be performed using a pass-through module. Random data patterns aresent to the adapter port. The data transmits from the port and then returns. The returned datais validated to determine port operation. Errors may indicate a failed port.Performing loopback tests through BCUUse the diag --loopback BCU command test to verify port function through a loopback test.bcu diag --loopback [-t ][-s ][-c ] [-p ]where:port_id ID of the port for which you want to run the test. This could be the PWWN, porthardware path, or user-specified port name. This could also be theadapter-index/port-index. For example, to specify adapter 1, port 1 you woulduse 1/1 as the port identification.loopback type Type of loopback test. Possible values are internal, external, and serdes.
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