Switch Configuration has been deleted itself......Dipesh Patel

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Nov 6th, 2007
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Dear Frieds,

I am working on a Network of around 300 Cisco Devices with 50 vlans.

I had faced one problem that ......There was one switch live in the network and its configuration also saved when last time changes made. But suddenly its configuration has been deleted. There was nothing in it like a new switch.

So I had reconfiguraed the switch and made it active. But I xcan not find the reason behind it? Can any one know the reason for the same ?

I am waiting for the reply soon ......

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ohassairi Tue, 11/06/2007 - 00:58
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some times if there are some power problems (power comes down suddenly then up but with violocity) this can erase the startup-config.

some times the flush is erased or damaged.

MUHAMMAD SHAHEEN Tue, 11/06/2007 - 05:09
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Can you check if the conig register is set correctly ?

Paste the output of show version here, so we can have a look. I don't think power can delete the cofig if config reg is correct.



Dipesh Patel Wed, 11/07/2007 - 01:45
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Dear Shasheen,


It's a Catalyst 2950C Switch and the Config reg. is 0xF before and now.So I don't think the problem of config reg.

Than also it may be due to it ...than pls give me the solution to prevent it in future.

Dipesh Patel Wed, 11/07/2007 - 01:49
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Dar Shaheen,

sh ver of the switch ..............

PTA2_SUB#sh ver

Cisco Internetwork Operating System Software

IOS (tm) C2950 Software (C2950-I6Q4L2-M), Version 12.1(22)EA4, RELEASE SOFTWARE


Copyright (c) 1986-2005 by cisco Systems, Inc.

Compiled Wed 23-Mar-05 15:33 by yenanh

Image text-base: 0x80010000, data-base: 0x80562000

ROM: Bootstrap program is C2950 boot loader

PTA2_SUB uptime is 1 day, 4 hours, 55 minutes

System returned to ROM by power-on

System restarted at 10:22:52 IST Tue Nov 6 2007

System image file is "flash:c2950-i6q4l2-mz.121-22.EA4.bin"

cisco WS-C2950C-24 (RC32300) processor (revision B0) with 21039K bytes of memory


Processor board ID FAB0538P0FN

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: 00:07:4F:11:D2:00

Motherboard assembly number: 73-5750-08

Motherboard serial number: FAB0537B1IF

Model revision number: B0

Model number: WS-C2950C-24

System serial number: FAB0538P0FN

Configuration register is 0xF

keller.oliver Wed, 11/07/2007 - 01:04
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It could be a technical issue like other answers suggested, but it may be a malicious user as well.

Speaking of VTP bombing (the famous scenario with a new switch overwriting your existing VLAN configuration), there are tools that can generate the necessary packets, so....

Check if you lost the entire switch config (hostname, passwords etc) or just VLAN config.

Dipesh Patel Wed, 11/07/2007 - 01:23
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I lost all the configuration including password , hostname everything not even vty terminal .....

than might be the reason ?


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