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err-disable 2950

Hi guys,

I am having 2950 problem. The error is err-disable on few interfaces. Everytime I have to issue shut and no shut. I got no problem on other switches(same model)

Anything idea?

FastEthernet0/14 is down, line protocol is down (err-disabled)

Hardware is Fast Ethernet, address is 0012.80c3.0ece (bia 0012.80c3.0ece)

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)

Cisco Internetwork Operating System Software

IOS (tm) C2950 Software (C2950-I6Q4L2-M), Version 12.1(22)EA1, RELEASE SOFTWA


Copyright (c) 1986-2004 by cisco Systems, Inc.

Compiled Mon 12-Jul-04 08:18 by madison

Image text-base: 0x80010000, data-base: 0x8055C000

ROM: Bootstrap program is C2950 boot loader

Switch uptime is 27 weeks, 5 days, 20 minutes

System returned to ROM by power-on

System restarted at 14:21:24 System image file is "flash:/c2950-i6q4l2-mz.121-22.EA1.bin"

cisco WS-C2950C-24 (RC32300) processor (revision Q0) with 20873K bytes of mem


Processor board ID FOC0848X25H

Last reset from system-reset

Running Enhanced Image

26 FastEthernet/IEEE 802.3 interface(s)

32K bytes of flash-simulated non-volatile configuration memory.

Base ethernet MAC Address: 00:12:80:C3:0E:C0

Motherboard assembly number: 73-5750-13

Power supply part number: 34-0965-01

Motherboard serial number: FOC08472325

Power supply serial number: DAB0843K5E3

Model revision number: Q0

Motherboard revision number: A0

Model number: WS-C2950C-24

System serial number: FOC0848X25H

Configuration register is 0xF




Re: err-disable 2950

You must have error detect feature enable on the switch.

Please check and paste the output of " show log " it will tell you why the port is going in error disable state.

If you find the cause you can have error disable recovery feature enabled on the switch and it will bring the interface up automatically. You can also disable the error detection feature on the switch.

errdisable recovery {cause {all | bpduguard | channel-misconfig | dhcp-rate-limit | dtp-flap | gbic-invalid | link-flap | loopback | pagp-flap | psecure-violation | security-violation | udld | vmps}} | {interval interval}

Please see the link for more help :


-amit singh

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