HP StorageWorks 2.12 Edge Switch - Manual (Page 88)

Monitoring and Managing the Switch
88 Edge Switch Element Manager User Guide
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 5 minutes, a bit-error threshold link
incident is generated.
■ CRC errors—A received frame failed a cyclic redundancy check (CRC)
validation, indicating that 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, a 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 that the destination device is unavailable.
■ Frames too short—A received frame exceeded the Fibre Channel frame
maximum size or was less than the Fibre Channel minimum size, indicating
that 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.
Operational Statistics
The following describes the Operational Statistics that display for a selected port:
■ Offline sequences Rx—The number of offline sequence that the port has
received.
■ Offline sequences Tx—The number of offline sequence that the port has
transmitted.
■ Link resets Rx—The number of link reset protocol frames received by this
port from the attached device. The switch receives a link reset from an
attached device if the device wishes to initiate the link reset or recover from a
link timeout.