Enterasys SmartSwitch 6000, User Manual

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Statistics
3-4 RMON Statistics
Problems
CRC/Alignment Indicates the number of packets processed by the network
segment that had a non-integral number of bytes (alignment
error) or a bad frame check sequence (Cyclic Redundancy
Check, or CRC error).
Fragments Indicates the number of packets processed by the network
segment that were undersized (less than 64 bytes in length; a
runt packet) and had either a non-integral number of bytes
(alignment error) or a bad frame check sequence (CRC error).
Jabbers Indicates the number of packets processed by the network
segment that were oversized (greater than 1518 bytes; a giant
packet) and had either a non-integral number of bytes
(alignment error) or a bad frame check sequence (CRC error).
Collisions Indicates the total number of receive (those the device detects
while receiving a transmission) and transmit (those the device
detects while transmitting) collisions detected on the network
segment.
Undersized Indicates the number of packets processed by the network
segment that contained fewer than 64 bytes (runt packets) but
were otherwise well-formed.
Oversized Indicates the number of packets processed by the network
segment that contained more than 1518 bytes (giant packets)
but were otherwise well-formed.
In their default state, the percentages displayed to the right of the numerical values for
these fields indicate what percentage of total packets transmitted on the network segment
were of the noted type. If you select the % of Tot. Errors option by clicking the mouse in
the check box, the percentages will indicate what percentage of problem, or error,
packets transmitted on the network segment were of the noted type; these percentages
will add up to 100. (The % of Tot. Errors option is active if there is a checkmark in the
check box.) The pie chart in the center of the window provides a graphical view of the
selected percentage breakdown; colors in the pie chart correspond to colors in the
percentage display boxes. Values listed to the right of the pie chart indicate peak delta
values recorded since the statistics screen was launched, and the date and time they
occurred.
Frame Size (Bytes) Packets
The Frame Size (Bytes) Packets fields indicate the number of packets (including error
packets) processed by the network segment that were of the noted length, excluding
framing bits but including frame check sequence bits. Packet sizes counted are:
• 64
• 65-127
• 128-255
• 256-511
• 512-1023
• 1024-1518