System information

Troubleshooting Ethernet
Book Title
4-62
show interfaces ethernet Field Descriptions
Field Description
Ethernet...is up...is
administratively down
Indicates whether the interface hardware is currently active and whether it has been taken
down by an administrator. “Disabled” indicates that the router has received more than
5,000 errors in a keepalive interval, which is 10 seconds by default.
line protocol
is {up | down |
administratively down}
Indicates whether the software processes that handle the line protocol believe the
interface is usable (that is, whether keepalives are successful) or if it has been taken
down by an administrator.
Hardware Hardware type (for example, MCI Ethernet, SCI, cBus Ethernet) and address.
Internet address Internet address followed by subnet mask.
MTU Maximum transmission unit of the interface.
BW Bandwidth of the interface in kilobits per second.
DLY Delay of the interface in microseconds.
rely Reliability of the interface as a fraction of 255 (255/255 is 100 percent reliability),
calculated as an exponential average over five minutes.
load Load on the interface as a fraction of 255 (255/255 is completely saturated), calculated as
an exponential average over five minutes.
Encapsulation Encapsulation method assigned to interface.
ARP type: Type of Address Resolution Protocol assigned.
loopback Indicates whether loopback is set.
keepalive Indicates whether keepalives are set.
Last input Number of hours, minutes, and seconds since the last packet was successfully received
by an interface. Useful for knowing when a dead interface failed.
Last output Number of hours, minutes, and seconds since the last packet was successfully
transmitted by an interface.
output Number of hours, minutes, and seconds since the last packet was successfully
transmitted by the interface. Useful for knowing when a dead interface failed.
output hang 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 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
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.