3Com SuperStack II PathBuilder S330 Reference Manual page 209

Viewing Performance and ATM Statistics 199
Filtering Statistics
MAC MTU Exceeded — The number of frames discarded because of a size
greater than the maximum MTU size for the port
No ATM VCs present — The number of frames discarded because there was no
ATM VC associated with the physical port
Bridge discards — The number of frames discarded due to the bridging
operation
Output port disabled — The number of frames discarded because the output
port was disabled
Source address filtered — The number of frames discarded due to source
address filtering
Destination address filtered — The number of frames discarded due to
destination address filtering
SAP Filtered — The number of frames discarded due to the protocol filtering
operation
Ethernet Statistics
Transmitted Frames — The total number of frames transmitted at this port
Transmitted bytes — The total number of bytes transmitted at this port
Received Frames — The total number of frames received at this port
Received bytes — The total number of bytes received at this port
CRC errored frames — The number of frames with CRC errors detected at this
port
Deferred transmits — The number of frames for which the first transmission
attempt at this port was delayed because the port was busy (not including frames
involved in collisions)
Single collisions — The number of successfully-transmitted frames at this port
for which transmission is inhibited by exactly one collision
Multiple collisions — The number of successfully-transmitted frames at this port
for which transmission is inhibited by more than one collision.
Late collisions — The number of times that a collision has been detected on this
port later than 512 bit-times into the transmission of a packet
Excessive collisions — The number of frames for which transmission at this port
failed due to excessive collisions.
Carrier sense errors — The number of times that the carrier sense condition was
lost or never asserted when attempting to transmit a frame at this port
Internal transmit errors — The number of frames for which reception at this
port failed due to an internal MAC sublayer receive error
Oversized frames — The number of frames received at this port that exceeded
the maximum permitted frame size
Alignment Errors — The total number of alignment errors detected for the
bridged physical port since the statistics were last cleared.