Switch Control

Shutting down a port

Quick commands:

enable
configure terminal
interface fastEthernet 0/17
shutdown
exit
exit

Turn back on:

enable
configure terminal
interface fastEthernet 0/17
no shutdown
exit
exit

Sample output:

switch-p1>enable
switch-p1#show interfaces fastEthernet 0/17
FastEthernet0/17 is down, line protocol is down
  Hardware is Fast Ethernet, address is 0050.d1d8.94d1 (bia 0050.d1d8.94d1)
  MTU 1500 bytes, BW 0 Kbit, DLY 100 usec, rely 255/255, load 1/255
  Encapsulation ARPA, loopback not set, keepalive not set
  Duplex setting unknown, Unknown Speed, 100BaseTX/FX
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input never, output never, output hang never
  Last clearing of "show interface" counters never
  Queueing strategy: fifo
  Output queue 0/40, 0 drops; input queue 0/75, 0 drops
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     1 packets input, 64 bytes, 0 no buffer
     Received 0 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 input packets with dribble condition detected
     1 packets output, 64 bytes, 0 underruns
     0 output errors, 0 collisions, 1 interface resets
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier
     0 output buffer failures, 0 output buffers swapped out
switch-p1#configure terminal
Enter configuration commands, one per line.  End with CNTL/Z.
switch-p1(config)#interface fastEthernet 0/17
switch-p1(config-if)#shutdown
%LINK-5-CHANGED: Interface FastEthernet0/17, changed state to administratively down
switch-p1(config-if)#no shutdown
%LINK-3-UPDOWN: Interface FastEthernet0/17, changed state to up
%LINK-3-UPDOWN: Interface FastEthernet0/17, changed state to down
switch-p1(config-if)#exit
switch-p1(config)#exit
switch-p1#

Show interface stats

switch-p1#show interfaces
VLAN1 is up, line protocol is down
  Hardware is CPU Interface, address is 0050.d1d8.94c0 (bia 0050.d1d8.94c0)
  MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec, rely 255/255, load 1/255
  Encapsulation ARPA, loopback not set, keepalive not set
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:10, output 00:00:10, output hang never
  Last clearing of "show interface" counters never
  Queueing strategy: fifo
  Output queue 0/40, 0 drops; input queue 0/75, 0 drops
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     137465 packets input, 10297233 bytes, 0 no buffer
     Received 89751 broadcasts, 0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 302 ignored, 0 abort
     0 input packets with dribble condition detected
     52396 packets output, 6878747 bytes, 0 underruns
     0 output errors, 0 collisions, 1 interface resets
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier
     0 output buffer failures, 0 output buffers swapped out
VLAN3 is up, line protocol is up
  Hardware is CPU Interface, address is 0050.d1d8.94c0 (bia 0050.d1d8.94c0)
  Internet address is 10.1.4.5/24
  MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec, rely 255/255, load 1/255
  Encapsulation ARPA
  ARP type: ARPA, ARP Timeout 04:00:00
FastEthernet0/1 is up, line protocol is up
  Hardware is Fast Ethernet, address is 0050.d1d8.94c1 (bia 0050.d1d8.94c1)
  MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec, rely 255/255, load 3/255
  Encapsulation ARPA, loopback not set, keepalive not set
  Full-duplex, 100Mb/s, 100BaseTX/FX
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:37, output 00:00:53, output hang never
  Last clearing of "show interface" counters never
  Queueing strategy: fifo
  Output queue 0/40, 0 drops; input queue 0/75, 0 drops
  5 minute input rate 4593000 bits/sec, 762 packets/sec
  5 minute output rate 1240000 bits/sec, 689 packets/sec
     260548696 packets input, 2531757155 bytes, 0 no buffer
     Received 22173 broadcasts, 0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 333 ignored, 0 abort
     0 watchdog, 2942 multicast
     0 input packets with dribble condition detected
     241281983 packets output, 3622221090 bytes, 0 underruns
     0 output errors, 0 collisions, 15 interface resets
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier
     0 output buffer failures, 0 output buffers swapped out
FastEthernet0/2 is up, line protocol is up
  Hardware is Fast Ethernet, address is 0050.d1d8.94c2 (bia 0050.d1d8.94c2)
  MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec, rely 255/255, load 1/255
  Encapsulation ARPA, loopback not set, keepalive not set
  Full-duplex, 100Mb/s, 100BaseTX/FX
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input never, output 00:00:54, output hang never
  Last clearing of "show interface" counters never
  Queueing strategy: fifo
  Output queue 0/40, 0 drops; input queue 0/75, 0 drops
  5 minute input rate 146000 bits/sec, 108 packets/sec
  5 minute output rate 98000 bits/sec, 114 packets/sec
     22830604 packets input, 905395220 bytes, 0 no buffer
     Received 9845 broadcasts, 0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 10 ignored, 0 abort
     0 watchdog, 3 multicast
     0 input packets with dribble condition detected
     23910838 packets output, 3702256298 bytes, 0 underruns
     0 output errors, 0 collisions, 1 interface resets
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier
     0 output buffer failures, 0 output buffers swapped out
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