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Chapter 3
Cisco CMTS Show Commands
Table 3-50 show interface cable Field Descriptions (continued)
Field
Note
no buffer
Received broadcast
runts
giants
input errors
CRC
frame
overrun
ignored
packets output
bytes
underruns
OL-1581-08
When using bundled cable interfaces on Cisco uBR7200 series routers, the input packet
counters for the master interface also include the packet counts for slave interfaces, except
when using a Broadband Processing Engine (BPE) cable interface (such as the
Cisco uBR-MC16U/X and Cisco uBR-MC28U/X). On BPE cards and on the Cisco uBR10012
router, the input counters for master and slave cable interfaces are not combined.
Description
Number of received packets discarded because there was no buffer
space in the main system.
Total number of broadcast or multicast packets received by the
interface.
Number of packets that are discarded because they are smaller than
the medium's minimum packet size.
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."
In addition, to account for the different Ethernet and other
Note
packet encapsulations on the network, packets are
considered giants when they exceed the configured MTU
size plus 114 bytes.
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.
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.
Number of packets received incorrectly having a CRC error and a
non-integer number of octets.
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.
Number of received packets ignored by the interface because the
interface hardware ran low on internal buffers.
Total number of messages sent by the system.
Total number of bytes, including data and MAC encapsulation, sent
by the system.
Number of times the sender has been running faster than the
receiving device can handle.
Cisco Broadband Cable Command Reference Guide
show interface cable
3-207
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