Monitoring and Managing the Switch
An incorrect primitive sequence was received from the attached device, indicating
a Fibre Channel link-level protocol violation. At the Hardware View, a yellow
triangle appears to indicate a link incident.
•
Discarded frames
A received frame could not be routed and was discarded because the frame timed
out (insufficient buffer-to-buffer credit) or the destination device was not logged
into the switch.
•
Invalid transmission words
The number of times that the switch detected invalid transmission words from the
attached device. This indicates that a frame or primitive sequence arrived at the
switch's port corrupted. This corruption can be due to the attached device
performing a reset, plugging or unplugging the 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.
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CRC errors
A received frame failed a cyclic redundancy check (CRC) validation, indicating
the frame arrived at the switch's port corrupted. Frame corruption may 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
A received frame had an unavailable or invalid Fibre Channel destination address,
or an invalid Fibre Channel source address. This typically indicates the
destination device is unavailable.
•
Frames too short
2–36
edge switch 2/16 product manager user guide