why can't i bring this interface back up?

[FrankFlintstone16044]

Switch(config-if)#shut

%LINK-5-CHANGED: Interface FastEthernet0/4, changed state to administratively down

Switch(config-if)#

Switch(config-if)#no shut

%LINK-5-CHANGED: Interface FastEthernet0/4, changed state to down

Switch(config-if)#

Switch(config-if)#

Switch(config-if)#do sh ip int brief

Interface IP-Address OK? Method Status Protocol

FastEthernet0/1 unassigned YES manual up up

FastEthernet0/2 unassigned YES manual up up

FastEthernet0/3 unassigned YES manual up up

FastEthernet0/4 unassigned YES manual down down

[Kasun Bandara]

check if your port connected to working network device from other side with working cable. 

[FrankFlintstone16044]

Yep, got a PC on the other side of it

C:\>ipconfig /all

Bluetooth Connection:(default port)

Connection-specific DNS Suffix..:

Physical Address................: 0005.5E16.CC05

Link-local IPv6 Address.........: ::

IPv6 Address....................: ::

IPv4 Address....................: 0.0.0.0

Subnet Mask.....................: 0.0.0.0

Default Gateway.................: ::

0.0.0.0

DHCP Servers....................: 0.0.0.0

DHCPv6 IAID.....................:

DHCPv6 Client DUID..............: 00-01-00-01-20-AE-BB-AE-00-10-11-15-32-85

DNS Servers.....................: ::

0.0.0.0

FastEthernet0 Connection:

Connection-specific DNS Suffix..:

Physical Address................: 0010.1115.3285

Link-local IPv6 Address.........: FE80::210:11FF:FE15:3285

IPv6 Address....................: ::

IPv4 Address....................: 192.168.10.4

Subnet Mask.....................: 255.255.255.0

Default Gateway.................: ::

0.0.0.0

DHCP Servers....................: 0.0.0.0

DHCPv6 IAID.....................:

DHCPv6 Client DUID..............: 00-01-00-01-20-AE-BB-AE-00-10-11-15-32-85

DNS Servers.....................: ::

0.0.0.0

[Kasun Bandara]

is switch link light blinking?

share #show interface fa 0/4 output

[FrankFlintstone16044]

Switch#sh int fa0/4

FastEthernet0/4 is down, line protocol is down (disabled)

Hardware is Lance, address is 0001.9615.6604 (bia 0001.9615.6604)

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

[Jon Marshall]

Check speed and duplex settings. 

Jon

[FrankFlintstone16044]

#hi, these were okay.  I disconnected and connected again and voila! Port came up?

[MHM Cisco World]

Show interface status 

When port is down 

Share here 

[balaji.bandi]

FastEthernet0/4 is down, line protocol is down (disabled)

Looks like for me Duplex issue, check, is this half or full duplex. ( change combination)

[Kasun Bandara]

share output of

#show run interface fa 0/4

also

make sure port speeds and duplex are matching both sides

[FrankFlintstone16044]

this command did not work

[Kasun Bandara]

can you share what you tried and output of #Show run ?

[Flavio Miranda]

Hi

 "show int status" is a better command for you as this is a layer 2 interface. 

If on the "show int status" the output is notconnect then you may have a cable problem of a hardware problem. 

 You also run 

test cable-diagnostics tdr interface gx/X

Use 'show cable-diagnostics tdr'

to see the result