Ethernet Frame Processing - 3Com corebuilder 3500 Implementation Manual

76 C 5: E
HAPTER THERNET
Ethernet Frame
Processing
All frames on an Ethernet network are received promiscuously by an
Ethernet port. A port can discard frames for either of the following
reasons:
There is no buffer space available.
The frame is in error.
Figure 10 shows the order in which frame discard tests are made.
Figure 10 How Frame Processing Affects Ethernet Receive Frame Statistics
rxFrames
noRxBuffers
rxInternalErrs
lengthErrs
alignmentErrs
fcsErrs
rxUcastFrames
=
rxMcastFrames
Packets received from the network
Packets discarded because buffer space was exhausted
Packets discarded because packet was in error
Packets delivered by the Ethernet port