Allied-telesis AT-S21 Manual do Utilizador descarregar pdf (Página 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)

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