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Displaying Ethernet Port Information 7-7
Frames are delivered to an Ethernet port by bridge and management
applications. However, a frame may be discarded for the following reasons:
■ The Ethernet port is disabled.
■ There is no room on the transmit queue.
■ An error occurred during frame transmission.
Figure 7-2 shows the order in which these discard tests are made.
Figure 7-2 How Frame Processing Affects Ethernet Transmit Frame Statistics
txUcastFrames
txMcastFrames
txDiscards
txQOverflows
excessDeferrals
excessCollision
carrierSenseErr
txInternalErrs
txFrames
Frames delivered to this port
Frames discarded because port disabled
Frames discarded because
transmit queue full
Frames successfully transmitted
to the network
processing of frames
Transmit Frame Statistics. . .
. . .to Ethernet
Network
=
Frames discarded because transmit
error during transmission