Information Technology Reference
In-Depth Information
Table4-6
show interfaces ethernet Field Descriptions (continued)
Received . . .
broadcasts
Shows the total number of broadcast or multicast packets
received by the interface.
Runts
Gives the number of packets that are discarded because they
are smaller than the medium's minimum packet size. For
instance, any Ethernet packet that is less than 64 bytes is
considered a runt.
giants
Gives the number of packets that are discarded because they
exceed the medium's maximum packet size. For example,
any Ethernet packet that is greater than 1518 bytes is
considered a giant.
input error
Includes runts, giants, no buffer, CRC, frame, overrun, and
ignored counts. Other input-related errors can also cause the
input error count to be increased, and some datagrams may
have more than one error; therefore, this sum may not balance
with the sum of enumerated input error counts.
CRC
Indicates that the cyclic redundancy checksum generated by
the originating LAN station or far-end device does not match
the checksum calculated from the data received. On a LAN,
this usually indicates noise or transmission problems on the
LAN interface or the LAN bus itself. A high number of CRCs
is usually the result of collisions or a station transmitting bad
data.
frame
Shows the number of packets received incorrectly having a
CRC error and a noninteger number of octets. On a LAN, this
is usually the result of collisions or a malfunctioning Ethernet
device.
overrun
Shows the number of times that the receiver hardware was
incapable of handing received data to a hardware buffer
because the input rate exceeded the receiver's capability to
handle the data.
ignored
Shows the number of received packets ignored by the
interface because the interface hardware ran low on internal
buffers. These buffers are different from the system buffers
mentioned previously in the buffer description. Broadcast
storms and bursts of noise can cause the ignored count to be
increased.
input packets with
dribble condition
detected
Gives the dribble bit error, which indicates that a frame is
slightly too long. This frame error counter is incremented just
for informational purposes; the router accepts the frame.
packets output
Shows the total number of messages transmitted by the
system.
bytes
Shows the total number of bytes, including data and MAC
encapsulation, transmitted by the system.
underruns
Gives the number of times that the transmitter has been
running faster than the router can handle. This may never be
reported on some interfaces.
