Editing Switch Control (section)

= Controlling port speed =

Quick commands, speed 10Mbps:
<pre>
enable
configure terminal
interface fastEthernet 0/17
speed 10
exit
exit</pre> 

Set to 100Mbps:
<pre>enable
configure terminal
interface fastEthernet 0/12
speed 100
exit
exit</pre>

Set to Auto (default):
<pre>enable
configure terminal
interface fastEthernet 0/12
speed auto
exit
exit</pre>
 
Sample output:
<pre>
switch-p1>enable
switch-p1#show interfaces fastEthernet 0/12
switch-p1#sh int FastEthernet0/12
FastEthernet0/12 is down, line protocol is down
  Hardware is Fast Ethernet, address is 0002.b9b1.4c0c (bia 0002.b9b1.4c0c)
  MTU 1500 bytes, BW 0 Kbit, DLY 0 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive not set
  Auto-duplex , 100Mb/s, 100BaseTX/FX
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input never, output 5w6d, 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
     1126 packets input, 1574484 bytes
     Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 0 multicast
     0 input packets with dribble condition detected
     779 packets output, 54919 bytes, 0 underruns
     0 output errors, 0 collisions, 2 interface resets
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier
switch-p1#configure terminal
Enter configuration commands, one per line.  End with CNTL/Z.
switch-p1(config)#interface fastEthernet 0/12
switch-p1(config-if)#speed 10
switch-p1(config-if)#exit
switch-p1(config)#exit
switch-p1#sh int FastEthernet0/12
FastEthernet0/12 is down, line protocol is down
  Hardware is Fast Ethernet, address is 0002.b9b1.4c0c (bia 0002.b9b1.4c0c)
  MTU 1500 bytes, BW 0 Kbit, DLY 0 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive not set
  Auto-duplex , 10Mb/s, 100BaseTX/FX
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input never, output 5w6d, 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
     1126 packets input, 1574484 bytes
     Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 0 multicast
     0 input packets with dribble condition detected
     779 packets output, 54919 bytes, 0 underruns
     0 output errors, 0 collisions, 2 interface resets
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier

switch-p1#
</pre>