Installation guide

5-24
Cisco uBR7100 Series Universal Broadband Router Software Configuration Guide
OL-2238-03
Chapter 5 Troubleshooting the System
Understanding Show Command Responses
See the following sample output for the downstream cable interface from the
show interface cable downstream command:
Router# show interface cable 1/0 downstream
Cable1/0: Downstream is up
111947771 packets output, 1579682655 bytes, 0 discarded
0 output errors
no buffer
Number of received packets discarded because there was no buffer
space in the main system.
Received broadcast
Total number of broadcast or multicast packets received by the
interface.
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 exceed the
medium’s maximum packet size.
input errors
Includes runts, giants, no buffers, CRC, frame, overrun, and
ignored counts.
CRC
Indicates the number of times the cyclic redundancy checksum
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 (with 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 transmitted by the system.
bytes
Total number of bytes, including data and MAC encapsulation,
transmitted by the system.
underruns
Number of times the transmitter ran faster than the receiving
device could handle.
output errors
Sum of all errors that prevented the final transmission of packets
out of the interface being examined.
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.
Table 5-4 show interface cable Command Field Descriptions (continued)
Field Description