Summit WM3000 Series Controller System Reference Guide 105
3 Click the Details button to view packet level statistics of any user defined interface. For more
information, see “Viewing Virtual Interface Statistics” on page 106.
4 Click the Graph button to view a graphical representation of the controller virtual interface statistics.
For more information, see “Viewing the Virtual Interface Statistics Graph” on page 107.
Packets In Dropped
Displays the number of dropped packets coming into the interface.
Packets are dropped if:
1 The input queue for the hardware device/software module handling the
interface definition is saturated/full.
2 Overruns occur when the interface receives packets faster than it can
transfer them to a buffer.
Packets In Error
Displays the number of error packets coming into the interface.
•
Runt frames
— Packets shorter than the minimum Ethernet frame
length (64 bytes).
•
CRC errors
— The
Cyclical Redundancy Check
(CRC) is the 4 byte
field at the end of every frame the receiving station uses to interpret if
the frame is valid. If the CRC value computed by the interface does
not match the value at the end of frame, it is considered as a CRC
error.
•
Late collisions
— A late collision is any collision that occurs after the
first 64 octets of data have been sent by the sending station. Late
collisions are not normal and are usually the result of out of
specification cabling or a malfunctioning device.
•
Misaligned frames
— A misaligned frame is a frame that somehow
gets out of sync with the receiving station’s receive clock recovery
circuit. Misalignment is reported if the frame ends with a CRC error
and extra bits are also detected.
Bytes Out
Displays the number of bytes going out on the interface.
Packets Out
Displays the number of packets going out on the interface.
Packets Out Dropped
Displays the number of dropped packets going out of the interface, due to
saturated output queues assigned to the interface processor or the
physical device/software module. Packets can be dropped due to
collisions as well.
Packets Out Error
Displays the number of error packets going out of the interface, including
frame forming errors or malformed packets transmitted over the interface.
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