Cisco Systems 17053 appendix Explanation of CatOS show mac Command Counters

Multiple	This is an indication of a half−duplex
Collisions	configuration.
Late
Collisions	This is an indication of faulty hardware (NIC,
Excessive	cable, or switch port) or a duplex mismatch.
Collisions	This is an indication of overutilization of the
Carrier	switch port at half−duplex or duplex mismatch.
Sense	This is an indication of faulty hardware (NIC,
	cable, or switch port).
	This is an indication of the result of collisions,
Runts	duplex mismatch, IEEE 802.1Q (dot1q), or an
	Inter−Switch Link Protocol (ISL) configuration
	issue.
Giants	This is an indication of faulty hardware, dot1q, or
	an ISL configuration issue.

Table 4￿Explanation of CatOS show mac Command Counters

Counter	Description
Rcv−Unicast	This is an indication of the number of unicast
	packets received.
Rcv−Multicast	This is an indication of the number of
	multicast packets received.
Rcv−Broadcast	This is an indication of the number of
	broadcast packets received.
Xmit−Unicast	This is an indication of the number of unicast
	packets transmitted.
Xmit−Multicast	This is an indication of the number of
	multicast packets transmitted.
Xmit−Broadcast	This is an indication of the number of
	broadcast packets transmitted.
Delay Exceeded	This is an indication of the number of frames
	discarded because of excessive delay in the
	switching process.
MTU−Exced	This is an indication that one of the devices on
	the port or segment transmits more than the
	allowed frame size.
In−Discard 2	Count of valid frames received which were
	discarded or filtered by the forwarding
	process.
Lrn−Discard 2	Packets which are forwarded and must not be
	forwarded.
In−Lost	Packets which can not be received because the
	input buffers are full.
Out−Lost	Packets which can not be transmitted because
	the output buffers are full.