Multiple
Collisions
This is an indication of a half−duplex
configuration.
Late
Collisions This is an indication of faulty hardware (NIC,
cable, or switch port) or a duplex mismatch.
Excessive
Collisions This is an indication of overutilization of the
switch port at half−duplex or duplex mismatch.
Carrier
Sense This is an indication of faulty hardware (NIC,
cable, or switch port).
Runts
This is an indication of the result of collisions,
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 4Explanation 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.
