Can't run 'show run' command on Cisco 1750 Router

Posted on 2010-11-10
Last Modified: 2012-05-10
I have a Cisco 1750 router that is constantly losing it's ability to route traffic. I can ping it and telnet to it, but at least once a day it stops routing. I logged into it and ran a 'sh ver' and that worked, but when I do a 'sh run' it gives me the message:

% Invalid input detected at '^' marker.

The ^ symbol is pointing to the 'u' in run. If I type in sh ? I don't see run as an option. Is there some other option I need to enter to see my configuration?
Question by:Greg27
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Author Comment

ID: 34103355
Here is the sh ver results:

Cisco Internetwork Operating System Software
IOS (tm) C1700 Software (C1700-Y-M), Version 12.1(6), RELEASE SOFTWARE (fc1)
Copyright (c) 1986-2000 by cisco Systems, Inc.
Compiled Wed 27-Dec-00 21:18 by kellythw
Image text-base: 0x80008088, data-base: 0x805E5778

ROM: System Bootstrap, Version 12.0(3)T, RELEASE SOFTWARE (fc1)

Router uptime is 2 days, 1 hour, 5 minutes
System returned to ROM by power-on
System image file is "flash:c1700-y-mz.121-6"

cisco 1750 (MPC860) processor (revision 0x601) with 12288K/4096K bytes of memory.
Processor board ID JAD050420ZP (4096001795), with hardware revision 3097
M860 processor: part number 0, mask 32
Bridging software.
X.25 software, Version 3.0.0.
1 FastEthernet/IEEE 802.3 interface(s)
1 Serial(sync/async) network interface(s)
32K bytes of non-volatile configuration memory.
4096K bytes of processor board System flash (Read/Write)

Accepted Solution

avilov earned 500 total points
ID: 34103419
you have to login with enable account

try to run


at the prompt, the prompt should change to #
it probably will ask for a password too

Author Comment

ID: 34103471
I thought when you connected via serial cable the password you were entering was the enable password. Is there a way to reset the enable password if you can't remember it?
Netscaler Common Configuration How To guides

If you use NetScaler you will want to see these guides. The NetScaler How To Guides show administrators how to get NetScaler up and configured by providing instructions for common scenarios and some not so common ones.


Assisted Solution

avilov earned 500 total points
ID: 34103569
1. it depends on your config

2. yes you can reset the password. but you need to reboot your router for that

Author Comment

ID: 34103603
Ok, looks like I found the password via a backup of the config. Can I ask one last question? I am trying to change the enable password. My config shows the following:

enable secret 5 xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
enable password xxxxxxxxx

If I enter 'enable password xxxxxxx' where xxxxxxxxx is the new password, it doesn't work. Can I take that line out of my config? What do I change about the secret?


Expert Comment

ID: 34103683
enable password uses very weak type-7 encryption that was broken many-many years ago. you should avoid it.

use enable secret, it has much better encryption
LVL 34

Expert Comment

by:Istvan Kalmar
ID: 34104417
plese try 'write terminal' it is same command....

Author Comment

ID: 34104548
So, do I need to do the following:

no enable password xxxxxxxxxxx

and then:

enable secret 5 xxxxxxxxxxxxxxx

Expert Comment

ID: 34104834

enable secret xxxxx
no enable password

Author Comment

ID: 34113575
When I do the enable secret xxxxx it is telling me:

The enable secret you have chosen is the same as your enable password.
That is not recommended. Re-enter the enable secret.

Now, this is not the same password I am using for my enable password, so not sure why I am seeing this.

Expert Comment

ID: 34114853
just change the secret, delete enable and _before_ saving to startup config, telnet (keeping serial connection open) and verify that password works

if everything looks good save the config

Author Closing Comment

ID: 34227921
Thanks for the help!

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