4
Using the Performance View
4-29
Monitoring and Managing the Switch
link, bad optics at either end of the cable, bad cable, or a dirty or
poor connection. Moving the connection around or replacing
cables can isolate the problem.
Some number of invalid transmission words are expected and
acceptable. Invalid transmission words within a frame are used to
produce the bit-error threshold link incident. If one or more
invalid transmission words are detected in 12 separate 1.5-second
samples within five minutes, a bit-error threshold link incident is
generated.
◆ CRC errors — The number of invalid cyclic redundancy checks.
Failed CRC validation indicates that the frame arrived at the
switch’s port corrupted. Frame corruption can be caused by
device disconnection, an optical transceiver failure at the device, a
bad fiber-optic cable, or a poor cable connection.
◆ Delimiter errors — The number of times that the switch detected
an unrecognized start-of-frame (SOF), an unrecognized
end-of-frame (EOF) delimiter, or an invalid class of service. This
indicates that the frame arrived at the switch’s port corrupted.
This corruption can be due to plugging/unplugging the link, bad
optics at either end of the cable, bad cable, or dirty or poor
connections. Moving the connection around or replacing cables
can isolate the problem.
◆ Address ID errors — The number of address identifier errors. A
received frame had an unavailable or invalid Fibre Channel
destination address, or an invalid Fibre Channel source address.
This typically indicates that the destination device is unavailable.
Class 2 Statistics These statistics relate to Class 2 frames:
◆ Received Frames — The number of Class 2 frames received by
this F_Port from its attached N_Port.
◆ Busied Frames — The number of F_BSY frames generated by this
F_Port against Class 2 frames. This can occur if frames are
received before the switch completes initialization or if the switch
is servicing so many reequests that it cannot process a new
request.
The port generates frames if the switch is not ready to accept
commands. This might indicate temporary congestion.
◆ Rejected Frames — The number of F_RJT frames generated by
this F_Port against Class 2 frames.
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