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Connectrix DS-32M2 User Guide
Monitoring and Managing the Switch
The switch transmits a link reset to initiate the link reset protocol
or recover from a link timeout. This occurs normally to establish
BB_Credit or recover lost BB_Credit. 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.
There are no thresholds for these values. You can determine that a
problem exists by the rate that the value changes. BB_Credit
starvation can occur if data is sent to a device faster than the
device can process the frames. Such a suituation can back up into
ISLs, degrading performance.
Error Statistics Error statistics show whether or not a port is operating correctly. Use
this data to isolate problems with port and link operations:
◆ Link failures — The number of link failures. A link failure is
recorded in response to a not operational sequence (NOS),
protocol timeout, or port failure. A yellow triangle appears in the
Hardware view to indicate a link incident. A red and yellow
diamond appears to indicate a port failure.
◆ Sync losses — The number of loss-of-synchronization errors,
which occur if the attached device is reset or disconnected from
the port. A yellow triangle appears in the Hardware view to
indicate a link incident.
◆ Signal losses — The number of loss-of-signal errors, which occur
if the attached device is reset or disconnected from the port. A
yellow triangle appears in the Hardware view to indicate a link
incident.
◆ Primitive sequence errors — The number of primitive sequence
protocol errors. A yellow triangle appears in the Hardware view
to indicate a link incident.
◆ Discarded frames — The total number of frames discarded. A
received frame cannot be routed and is discarded if the frame
times out (insufficient buffer-to-buffer credit) or the destination
device is not logged in to 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
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