Specifications

show interfaces cable-modem
Bridging and Routing Features for the Cisco uBR904 Cable Modem 33
To display the number of packets and bytes of each protocol type passing through the cable modem
interface, use the accounting option with the show interface cable-modem command:
uBR904# show interface cable-modem 0 accounting
cable-modem0
Protocol Pkts In Chars In Pkts Out Chars Out
IP 545 185502 159 90240
Trans. Bridge 3878 964995 12597 1611142
ARP 73 3066 86 4128
overrun Number of times the receiver hardware was unable to hand 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. 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.
abort Number of packets whose receipt was aborted.
packets output Total number of messages transmitted by the system.
bytes Total number of bytes, including data and MAC encapsulation, transmitted by
the system.
underruns Number of times the transmitter has been running faster than the router can
handle.
output errors Sum of all errors that prevented the final transmission of datagrams out of the
interface being examined. Note that this may not balance with the sum of the
enumerated output errors, as some datagrams might have more than one error,
and others might have errors that do not fall into any of the specifically tabulated
categories.
collisions Number of messages retransmitted due to an Ethernet collision. This is usually
the result of an overextended LAN (Ethernet or transceiver cable too long, more
than two repeaters between stations, or too many cascaded multiport
transceivers). A packet that collides is counted only once in output packets.
interface resets Number of times an interface has been completely reset. This can happen if
packets queued for transmission were not sent within several seconds. On a
serial line, this can be caused by a malfunctioning modem that is not supplying
the transmit clock signal, or by a cable problem. If the system notices that the
carrier detect line of a serial interface is up, but the line protocol is down, it
periodically resets the interface in an effort to restart it. Interface resets can also
occur when an interface is looped back or shut down.
output buffer failures Number of times the output buffer has failed.
output buffers swapped out Number of times the output buffer has been swapped out.
Table 4 Show Interfaces Cable-Modem Field Descriptions (Continued)
Field Description