HP StorageWorks 2/16V Brocade Fabric OS Command Reference Manual - Supporting - Page 380

2 loopPortTest loopPortTest Functional test of L_Port M->M path on a loop. Synopsis loopporttest [-nframes count][-ports itemlist][-seed payload_pattern][-width pattern_width] Description Use this command to verify the operation of the switch by sending frames from port M's transmitter and looping the frames back through an external fiber cable, including all the devices on the loop, into port M's receiver. This exercises all the switch components, from the main board, to the SFP, to the fiber cable, to the SFPs (of the devices and the switch), and back to the main board. The cables and SFPs connected should be of the same technology, meaning that a short wavelength SFPed (switch) port is connected to another short wavelength SFPed (device) port through a short wavelength cable; and a long wavelength port is connected to a long wavelength port; and a copper port is connected to a copper port. Only one frame is transmitted and received at any one time. The port LEDs flicker green rapidly while the test is running. The test method is as follows: Determine which ports are L_Ports. Enable ports for cabled loopback mode. Create a frame F of data size (1024 bytes). Transmit frame F through port M, with D_ID to the FL_Port (AL_PA = 0). Pick up the frame from port M, the FL_Port. Check if any of the eight statistic error counters are nonzero: ENC_in, CRC_err, TruncFrm, FrmTooLong, BadEOF, Enc_out, BadOrdSet, DiscC3. Check if the transmit, receive, or class 3 receiver counters are stuck at some value. Check if the number of frames transmitted is not equal to the number of frames received. Repeat Steps 3 through 8 for all ports present until either the number of frames requested is reached or all ports are marked bad. You can specify a payload pattern to be used when executing this test. If the pattern is not specified, then at every 30 passes, a different data type is used to generate a new pattern to create the frame. The data pattern is generated based on each data type. Some data types might generate different data patterns on every pass. The data types are repeated every 210 pass. The use of nondefault operands for diagnostics commands is recommended for advanced users and technical support only. This command is supported only on Brocade 200E, 3250, 3850, 3900,4100, 24000, and 48000 platforms; use portTest instead. The execution of this command is subject to Admin Domain restrictions that may be in place. Operands This command has the following operands: -nframes count Specify the number of times (or number of frames per port) to execute this test. The default value is 10. The maximum value is 2,147,483,647, which is (2 ^ 31 - 1). 348 Fabric OS Command Reference Manual 53-1000436-01