Cabletron-systems 2000 User Manual download pdf (Page 130)

Statistics

4-4 RMON Statistics

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 Þelds 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 button 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 check mark 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 Þelds 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

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Cabletron-systems 2000 User Manual Page 130

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