Motorola Series Switch WS5100 - Manual (Page 91)

Network Setup 4-17
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 4-17 .
4. Click the Graph button to view a graphical representation of the switch virtual interface statistics. For
more information, see Viewing the Virtual Interface Statistics Graph on page 4-19 .
4.4.2.1 Viewing Virtual Interface Statistics
To view detailed virtual interface statistics:
1. Select a record from the table displayed in the Statistics screen.
Packets In Error Displays the number of error packets coming into the interface.It includes:
• 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 CRC value computed
by the interface does not match with 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 spec. 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 of the interface.
Packets Out Dropped Displays the number of dropped packets going out of the interface, due to the 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.