GigabitEthernet0/3 is down, line protocol is down (err-disabled)

[djgizmo250]

We had a 3560 go down today. It had an err-disable on its GigabitEthernet port.

This is a first. Do you guys have any clue as to why it would do this?

The 6513 FastEthernet stated that it was up/up.

I'm scratching my head for now...

Thanks!

[mohammedmahmoud]

Hi,

Please post the output of "show interface status err-disabled", it should have the reason, example:

Switch#show interfaces status err-disabled

Port Name Status Reason

Fa0/13 err-disabled bpduguard

BR,

Mohammed Mahmoud.

[djgizmo250]

I already put the switch online by doing a shut/no shut on the port.

Here's the output of the show interface g0/3.

GigabitEthernet0/3 is down, line protocol is down (err-disabled)

Hardware is Gigabit Ethernet, address is 0013.1933.ef9b (bia 0013.1933.ef9b)

MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,

reliability 255/255, txload 1/255, rxload 1/255

Encapsulation ARPA, loopback not set

Keepalive set (10 sec)

Auto-duplex, Auto-speed

input flow-control is off, output flow-control is off

ARP type: ARPA, ARP Timeout 04:00:00

Last input 00:59:19, output 00:59:19, 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

178072502 packets input, 3914189599 bytes, 0 no buffer

Received 129108645 broadcasts (0 multicast)

0 runts, 0 giants, 0 throttles

0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

0 watchdog, 77596408 multicast, 0 pause input

0 input packets with dribble condition detected

35696681 packets output, 393726150 bytes, 0 underruns

[mohammedmahmoud]

Hi,

Without the output of "show interfaces status err-disabled" we can't say what was the reason of the err-disable, please issue it if this reoccurs.

BR,

Mohammed Mahmoud.

[djgizmo250]

Will do. Thanks for the input.

I was in a panic mode and wanted to get the department back online ASAP.

If it occurs again, I'll be sure to issue the "show interfaces status err-disabled".

Thanks again!

[mohammedmahmoud]

Hi,

You are very welcomed, and good luck.

BR,

Mohammed Mahmoud.