This is the final one in the show interface series. The show interfaces command displays information and statistics about the interfaces. Example:
R1# show interfaces fastethernet 2/1/1
FastEthernet2/1/1 is up, line protocol is up
Hardware is SPA-4FE-7304, address is 00b0.64ff.5d80 (bia 00b0.64ff.5d80)
Description: Link to R2
Internet address is 192.168.50.1/24
MTU 9216 bytes, BW 100000 Kbit, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 100Mb/s, 100BaseTX/FX
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:22, output 00:00:02, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
5 packets input, 320 bytes
Received 1 broadcasts (0 IP multicast)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog
0 input packets with dribble condition detected
8 packets output, 529 bytes, 0 underruns
0 output errors, 0 collisions, 2 interface resets
0 babbles, 0 late collision, 0 deferred
2 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out
Let's break down the output:
Cisco documentation: show interfaces
R1# show interfaces fastethernet 2/1/1
FastEthernet2/1/1 is up, line protocol is up
Hardware is SPA-4FE-7304, address is 00b0.64ff.5d80 (bia 00b0.64ff.5d80)
Description: Link to R2
Internet address is 192.168.50.1/24
MTU 9216 bytes, BW 100000 Kbit, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 100Mb/s, 100BaseTX/FX
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:22, output 00:00:02, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
5 packets input, 320 bytes
Received 1 broadcasts (0 IP multicast)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog
0 input packets with dribble condition detected
8 packets output, 529 bytes, 0 underruns
0 output errors, 0 collisions, 2 interface resets
0 babbles, 0 late collision, 0 deferred
2 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out
Let's break down the output:
- FastEthernet2/1/1 is up, line protocol is up indicates whether the hardware is active and whether the software process that handle the line protocol consider the interface usable.
- Hardware is SPA-4FE-7304, address is 00b0.64ff.5d80 (bia 00b0.64ff.5d80) displays the hardwarwe type and MAC address.
- Description: Link to R2 is optional and appears only if the administrator has configured a description on the interface.
- Internet address is 192.168.50.1/24 shows the IP address configured on the interface with the subnet mask.
- MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec, reliability 255/255, txload 1/255, rxload 1/255 indicates the MTU value, the bandwidth in kilobits per second, the delay in microseconds, reliability as a fraction of 255 (255/255 is 100% reliability), txload (transmit) and rxload (receive) as a fraction of 255 (255/255 is completely saturated), calculated as an exponential average over 5 minutes.
- Encapsulation ARPA, loopback not set shows the encapsulation method assigned to the interface and if a looback is set.
- Keepalive set (10 sec) shows if keepalives are set and the time interval.
- Full-duplex, 100Mb/s, 100BaseTX/FX indicates the duplex mode, speed, and media protocol standard of the interface.
- ARP type: ARPA, ARP Timeout 04:00:00 indicates the type of ARP assigned and the timeout period.
- Last input 00:00:22, output 00:00:02, output hang never indicates when the last packet was successfully and processed locally (last input), when the last packet was successfully transmitted by the interface (output), and when (or never) the interface was last reset because a transmission took too long (output hang).
- Last clearing of "show interface" counters never is quite literal and indicates when the cumulative interface counters were last reset to zero.
- Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0 indicates the number of packets in the input queue (size), the maximum size of the queue (max), how many packets have been dropped due to a full input queue (drop), the number of packets dropped as a part of selective packet discard (flushes), and the total number of packets dropped because of a full output queue (total output drops).
- Queueing strategy: fifo indicates the type of queueing active on this interface. The default is first in, first out (FIFO).
- Output queue: 0/40 (size/max) indicates the number of packets in the output queue (size), and the maximum size of the queue (max).
- 5 minute input rate 0 bits/sec, 0 packets/sec and 5 minute output rate 0 bits/sec, 0 packets/sec indicate the average number of bits and packets transmitted per second in the last 5 minutes.
- 5 packets input, 320 bytes indicates the number of received error-free packets (packets input) and the size of them (bytes).
- Received 1 broadcasts (0 IP multicast) indicates the number of received broadcasts or multicasts.
- 0 runts, 0 giants, 0 throttles indicates the number of packets discarded because they are smaller than the minimum packet size for the interface (runts), the number of packets discarded because they exceed the maximum packet size for the interface (giants), and the number of times the receiver was disabled, possibly due to buffer or processor overload (throttles).
- 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored indicates the total number of input errors (including runts, giants, no buffer, CRC, frame, overrun, and ignored counts), the number of failed cyclic redundancy checks (CRC), the number of packets received incorrectly having a CRC error and a non-integer number of octects (frame), the umber 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 (overrun), and the number of received packets ignored by the interface because the interface hardware ran low on internal buffers (ignored).
- 0 watchdog indicates the number of times the watchdog receive timer expires.
- 0 input packets with dribble condition detected indicates the number of packets that are slightly longer than usual.
- 8 packets output, 529 bytes, 0 underruns indicates the total number of packets and bytes transmitted on the interface, and the number of times the transmitter has been running faster than the speed a router can handle.
- 0 output errors, 0 collisions, 2 interface resets indicates the sum of all the errors that prevented the final transmission of packets out of the interface (output errors), the number of messages retransmitted because of an Ethernet collision (collisions), and the number of times an interface is completely reset (interface resets).
- 0 babbles, 0 late collision, 0 deferred indicates the number of times the transmit jabber timer expired (babbles), the number of collisions that occurred after the preamble is transmitted (late collisions), and the number of times the interface had to defer while ready to transmit a frame because the carrier was asserted (deferred).
- 2 lost carrier, 0 no carrier indicates the number of times the carrier was lost during transmission (lost carrier), and the number of times the carrier was not present during the transmission (no carrier).
- 0 output buffer failures, 0 output buffers swapped out indicates the umber of failed buffers (buffer failures), and number of buffers swapped out (output buffers swapped out).
Cisco documentation: show interfaces
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