Allied Telesis AT-S21 - Manual (Page 60)

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To view received statistics at the switch level
Select Ethernet Statistics from the main menu to
display the Receive Statistics Graph similar to
Figure 4-2.
The graph shows the types of frames the switch has received
over a period since the switch’s last reset or since someone has
last set the counters to zero.
See Table 4-1 for a definition of received frames.
Table 4-1 Received Ethernet Frames
Frame Type Description
Received Good Frames Total number of frames received by the switch since the last reset
Filtered Frames Frames received by the switch but not forwarded because the
destination is within the same LAN segment, therefore, the frame
was already seen by all nodes on the segment
Broadcasts Frames received by the switch destined for ALL nodes on the
network, excluding multicast frames
Multicasts Frames received by the switch destined for multiple but specific
addresses, excluding broadcast frames
CRC Errors Frames with a cyclic redundancy check (CRC) error but with the
proper length (64-1518 bytes)
Alignment Errors Frames with a non-integral number of bytes, that is, frame length in
bits are not evenly divisible by 8, but with the proper length (64-
1518 bytes)
Undersized Frames Frames less than the minimum specified by IEEE 802.3 (64 bytes
including the CRC); also called runts
Fragments Total undersized frames, frames with alignment errors, and frames
with FCS errors (CRC errors)
Long Frames Frames exceeding the maximum specified by IEEE 802.3 (1518 bytes
including the CRC)