Cisco Broadband Cable Command Reference Guide

show interface cable
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Table 2-35 show interface cable Field Descriptions (continued)
Field Description
Cisco Broadband Cable Command Reference Guide
Chapter 2 Cisco Cable Modem Termination System Commands
runts Number of packets that are discarded because they are smaller than
the medium’s minimum packet size.
giants Number of packets that are discarded because they are bigger than
the standard Ethernet Maximum Transmission Unit (MTU) size.
For Ethernet packets, RFC 1757 defines giants as “the total number
of packets received that were longer than 1518 octets (excluding
framing bits, but including FCS octets) and were otherwise well
formed.”
input errors Total number of errors received on the interface. This count
includes runts and giants, which are shown above, as well as other
errors, such as no buffers, and CRC, frame, overrun, and ignored
counts. This count can also include DOCSIS protocol errors such
as an invalid SID in the DOCSIS frame, a bad extended header
length, corrupted concatenated packets, and invalid bandwidth
requests.
CRC Indicates the number of times the cyclic redundancy checksum
(CRC) generated by the originating LAN station or far-end device
does not match the checksum calculated from the data received.
frame Number of packets received incorrectly having a CRC error and a
non-integer number of octets.
overrun Number of times the receiver hardware was unable to forward
received data to a hardware buffer because the input rate exceeded
the receiver’s ability to handle the data.
ignored Number of received packets ignored by the interface because the
interface hardware ran low on internal buffers.
packets output Total number of messages sent by the system.
bytes Total number of bytes, including data and MAC encapsulation, sent
by the system.
underruns Number of times the sender has been running faster than the
receiving device can handle.
output errors Sum of all errors that prevented the final transmission of packets
out of the interface being examined.
collisions Not applicable to the Cisco uBR7246.
interface resets Number of times an interface has been completely reset.
output buffer failures Number of times the output buffer has failed.
output buffer swapped out Number of times the output buffer has been swapped out.
Tip In Cisco IOS Release 12.1(12)EC, 12.2(8)BC1, and later releases, you can add a timestamp to show
commands using the exec prompt timestamp command in line configuration mode.
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