3Com SUPERSTACK 2200 User Manual page 81

7-6 C 7: A
HAPTER DMINISTERING
Frame Processing and
Ethernet Statistics
E P
THERNET ORTS
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.
Receive Frame. . .
rxFrames
noRxBuffers
rxInternalErrs
lengthErrs
alignmentErrs
fcsErrs
rxUcastFrames
=
rxMcastFrames
Figure 7-1 How Frame Processing Affects Ethernet Receive Frame Statistics
Frames received from the network
Frames discarded because buffer space
was exhausted
Frames discarded because frame in error
Frames delivered by this Ethernet port
. . .from Ethernet
Network