Information Technology Reference
In-Depth Information
Sample Display
The following is sample output from the show interfaces command for the Ethernet 0 interface:
Router# show interfaces ethernet 0
Ethernet 0 is up, line protocol is up
Hardware is MCI Ethernet, address is aa00.0400.0134 (via 0000.0c00.4369)
Internet address is 131.108.1.1, subnet mask is 255.255.255.0
MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec, rely 255/255, load 1/255
Encapsulation ARPA, loopback not set, keepalive set (10 sec)
ARP type: ARPA, PROBE, ARP Timeout 4:00:00
Last input 0:00:00, output 0:00:00, output hang never
Output queue 0/40, 0 drops; input queue 0/75, 2 drops
Five minute input rate 61000 bits/sec, 4 packets/sec
Five minute output rate 1000 bits/sec, 2 packets/sec
2295197 packets input, 305539992 bytes, 0 no buffer
Received 1925500 broadcasts, 0 runts, 0 giants
3 input errors, 3 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
0 input packets with dribble condition detected
3594664 packets output, 436549843 bytes, 0 underruns
8 output errors, 1790 collisions, 10 interface resets, 0 restarts
Table 4-6 presents show interfaces ethernet field descriptions.
Table4-6
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 that the interface is usable (that is, whether
keepalives are successful) or if it has been taken down by an
administrator.
Hardware
Specifies the hardware type (for example, MCI Ethernet, SCI,
cBus Ethernet) and address.
Internet address
Specifies the Internet address, followed by the subnet mask.
MTU
Gives the maximum transmission unit of the interface.
BW
Gives the bandwidth of the interface in kilobits per second.
DLY
Gives the delay of the interface in microseconds.
rely
Shows reliability of the interface as a fraction of 255
(255/255 is 100 percent reliability), calculated as an
exponential average over 5 minutes.
load
Shows load on the interface as a fraction of 255 (255/255 is
completely saturated), calculated as an exponential average
over 5 minutes.
Encapsulation
Specifies the encapsulation method assigned to interface.
ARP type
Specifies the type of Address Resolution Protocol assigned.
loopback
Indicates whether loopback is set.
keepalive
Indicates whether keepalives are set.
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