show interfaces status command

By | June 8, 2020

The status of an interface on a Cisco switch can be checked using the show interface TYPE exec mode command. Consider the following example:

SW1#show interfaces fa0/1
FastEthernet0/1 is up, line protocol is up (connected)
  Hardware is Lance, address is 0040.0b21.0b01 (bia 0040.0b21.0b01)
 BW 100000 Kbit, DLY 1000 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 100Mb/s
  input flow-control is off, output flow-control is off
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:08, output 00:00:05, 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
     956 packets input, 193351 bytes, 0 no buffer
     Received 956 broadcasts, 0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     0 watchdog, 0 multicast, 0 pause input
     0 input packets with dribble condition detected
     2357 packets output, 263570 bytes, 0 underruns
     0 output errors, 0 collisions, 10 interface resets
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier
     0 output buffer failures, 0 output buffers swapped out

As you can see from the output above, this command gives us plenty of information about the specified interface. Here is a brief description of the most important lines:

  • FastEthernet0/1 is up, line protocol is up (connected) – indicates that the interface is in the up and up state
  • Hardware is Lance, address is 0040.0b21.0b01 – Lance indicates the chipset used by the port. The MAC address of the port is also listed
  • BW 100000 Kbit, DLY 1000 usec – the bandwidth and delay of the interface
  • Full-duplex, 100Mb/s – the port operates in the full duplex mode and supports the speed of up to 100Mb/s
  • 956 packets input, 193351 bytes, 0 no buffer – the total number and size of packets received by the port.
  • Received 956 broadcasts – the total number of broadcast packets received by the device.
  • 0 input errors, 0 CRC, 0 frame… – the number of received packets that were received incorrectly.
  • 2357 packets output, 263570 bytes, 0 underruns – he total number and size of packets sent by the port.
  • 0 output errors, 0 collisions – the number of packets that were not sent because of an error and the number of Ethernet collisions.

Prerequisites for 200-301

200-301 is a single exam, consisting of about 120 questions. It covers a wide range of topics, such as routing and switching, security, wireless networking, and even some programming concepts. As with other Cisco certifications, you can take it at any of the Pearson VUE certification centers.

The recommended training program that can be taken at a Cisco academy is called Implementing and Administering Cisco Solutions (CCNA). The successful completion of a training course will get you a training badge.

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