Information Technology Reference
In-Depth Information
Table4-6
show interfaces ethernet Field Descriptions (continued)
Last input
Gives the number of hours, minutes, and seconds since the
last packet was successfully received by an interface. This is
useful for knowing when a dead interface failed.
Last output
Gives the number of hours, minutes, and seconds since the
last packet was successfully transmitted by an interface.
output
Gives the number of hours, minutes, and seconds since the
last packet was successfully transmitted by the interface. This
is useful for knowing when a dead interface failed.
output hang
Gives the number of hours, minutes, and seconds (or never)
since the interface was last reset because of a transmission
that took too long. When the number of hours in any of the
“last” fields exceeds 24 hours, the number of days and hours
is printed. If that field overflows, asterisks are printed.
Last clearing
Gives the time at which the counters that measure cumulative
statistics (such as number of bytes transmitted and received)
shown in this report were last reset to zero. Note that
variables that might affect routing (for example, load and
reliability) are not cleared when the counters are cleared.
“***” indicates that the elapsed time is too large to be
displayed.
“0:00:00” indicates that the counters were cleared more than
231ms (and less than 232ms) ago.
Output queue, input
queue, drops
Gives the number of packets in output and input queues. Each
number is followed by a slash, the maximum size of the
queue, and the number of packets dropped due to a full queue.
Five minute input
rate, Five minute
output rate
Gives the average number of bits and packets transmitted per
second in the past 5 minutes. If the interface is not in
promiscuous mode, it senses network traffic it sends and
receives (rather than all network traffic).
The 5-minute input and output rates should be used only as
an approximation of traffic per second during a given
5-minute period. These rates are exponentially weighted
averages with a time constant of 5 minutes. A period of four
time constants must pass before the average will be within 2
percent of the instantaneous rate of a uniform stream of
traffic over that period.
packets input
Gives the total number of error-free packets received by the
system.
continues
bytes input
Gives the total number of bytes, including data and MAC
encapsulation, in the error-free packets received by the
system.
no buffers
Gives the number of received packets discarded because
there was no buffer space in the main system. Compare this
with the ignored count. Broadcast storms on Ethernet
networks and bursts of noise on serial lines are often
responsible for no input buffer events.
