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7-6 CHAPTER 7: ADMINISTERING ETHERNET PORTS
Frame Processing and
Ethernet Statistics
All frames on the Ethernet network are received promiscuously by an
Ethernet port. However, frames may be discarded for the following reasons:
■ There is no buffer space available.
■ The frame is in error.
Figure 7-1 shows the order in which these discard tests are made.
Figure 7-1 How Frame Processing Affects Ethernet Receive Frame Statistics
rxFrames
noRxBuffers
rxInternalErrs
lengthErrs
alignmentErrs
fcsErrs
rxUcastFrames
rxMcastFrames
Frames received from the network
Frames discarded because buffer space
was exhausted
Frames discarded because frame in error
Frames delivered by this Ethernet port
processing of frames
Receive Frame. . .
. . .from Ethernet
Network
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