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Hello ,

does any one have an idea about switch ports going on err-disabled state  suddenly

In fact , we have Switch CISCO 3560 POE -48  to each port is connected an IP phone  with embedded switch connected to a PC

Sometimes we find the port down   , when we  enter the sh interface command whe have :

FastEthernet1/0/5 is down, line protocol is down (err-disabled)
  Hardware is Fast Ethernet, address is 0024.c318.2387 (bia 0024.c318.2387)
  MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Auto-duplex, Auto-speed, media type is 10/100BaseTX
  input flow-control is off, output flow-control is unsupported
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 9w4d, output 9w4d, 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
     16375217 packets input, 3101173312 bytes, 0 no buffer
     Received 250969 broadcasts (0 multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 226491 multicast, 0 pause input
     0 input packets with dribble condition detected
     189641431 packets output, 25371607307 bytes, 0 underruns
     0 output errors, 24 collisions, 1 interface resets
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier, 0 PAUSE output
     0 output buffer failures, 0 output buffers swapped out

You can find here the port configuration on the switch

interface FastEthernet1/0/5
switchport access vlan 1700
switchport mode access
switchport voice vlan 1500
spanning-tree portfast
spanning-tree bpduguard enable

Cisco Employee

Hi Hatem,

show interface Fa 1/0/5  status err-disabled

will give you the reason for why the port was errdisabled.