Reference Guide

Brocade Fabric OS Command Reference 811
53-1004112-02
portLoopbackTest
CSPAT: 0x7e, 0x7e, 0x7e, 0x7e, ...
BYTE_LFSR: 0x69, 0x01, 0x02, 0x05, ...
CHALF_SQ: 0x4a, 0x4a, 0x4a, 0x4a, ...
QUAD_NOT: 0x00, 0xff, 0x00, 0xff, ...
CQTR_SQ: 0x78, 0x78, 0x78, 0x78, ...
CRPAT: 0xbc, 0xbc, 0x23, 0x47, ...
RANDOM: 0x25, 0x7f, 0x6e, 0x9a, ....
Notes Do not abort this test prematurely, using CTRL-C or q to quit. Doing so may cause the test to report unexpected
errors. Errors may vary depending on the hardware platform.
You cannot interrupt the test by pressing the return key (<cr>).
This command does not support High Availability (HA).
The following restrictions apply on the Brocade G620 switch:
• 32 Gbps SFPs supports 32G/16G/8G speeds
• 16 Gbps SFPs supports 16G/8G/4G speeds
• 10 Gbps SFPs supports only 10G speed
• 10 Gbps spd_mode works only with lb_mode 2 with 10 Gbps SFP only and does not work with lb_mode 1
• 16 Gbps and 32 Gbps SFPs do not support 10G speed in lb_mode 1 or 2
The Brocade 8510/DCX series cannot negotiate speeds of 1 Gbps.
This diagnostic cannot be run on an operational switch. You must disable the switch using the chassisDisable
command before you can run this test. After the test completes, re-enable the switch using the chassisEnable
command. Do not use the switchDisable command followed by manually shutting down the ports before running
the test. This will not work because executing switchEnable after the test completes will leave the ports in the same
state as before. The only way to bring the ports down before running the test and back up after the test completes
is by using the chassisDisable command followed by the chassisEnable command.
The 32 Gbps-capable platforms support only lb_mode 1 and 2.
The execution of this command is subject to Virtual Fabric restrictions that may be in place. Refer to "Using Fabric
OS Commands" and "Command Availability" for details.
Operands This command has the following operands:
--slot slot
Specifies the number of the slot on which to run the diagnostics. All eligible ports relative to
the slot number are tested. The default is 0 and designed to operate on fixed-port-count
products.
-nframes count
Specifies the number of frames to send. The test progresses until the specified number of
frames has been transmitted on each port. The default value is 1. The maximum number of
frames sent is limited to 1000 on 16 Gbps-capable platforms and to 2000 on 32
Gbps-capable platforms. If the number of frames exceeds maximum limit, the test
proceeds with the initial maximum limit of frames (for example, 1000 on 16 Gbps-capable
platforms) and displays a warning message.