Console of 3750 switch shows garbage characters,Unable to access

[mahesh18]

Hi Everyone,

On 3750 Switch when i power it on and console it shows few garbage characters







































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                                                            Úþ@~ ï € ýðû÷À ~Àà¿

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&“æ{

Frond lights are green

It does not go further .

Currently i am unable to access switch it shows as ne to other switches.

But it has no config so i am unable to telnet it also

Thanks

MAhesh

[mahmoodmkl · Accepted solution]

Hi
can u try with different baud rates

Sent from Cisco Technical Support iPhone App

[mahesh18]

hi,

i tried 9600 and 4800.

will try others now

thanks

mahesh

[mahesh18]

Hi,

I tried console 11500 it worked.

config shows

line con 0

speed 115200

If i change the line console speed in running config does it will go back to old speed of 9600?

Thanks

mahesh

[mahesh18]

Hi,

I changed speed of console to 9600 and did save config and did reboot.

but it does not work with console speed of 9600  when i choose speed of 11500 it worked.

How can i change the speed of console to 9600 so that console can accept it?

thanks

Mahesh

[Reza Sharifi · Accepted solution]

Hi Mahesh,

After you change the speed, issue

sh line con 0

you should see something like this:

Switch(config-line)#do sh lin con 0

   Tty Typ     Tx/Rx    A Modem  Roty AccO AccI   Uses   Noise  Overruns   Int

     0 CTY              -    -      -    -    -      0       0     0/0       -

Line 0, Location: "", Type: ""

Length: 24 lines, Width: 80 columns

Baud rate (TX/RX) is 9600/9600, no parity, 2 stopbits, 8 databits

Status: Ready, 0x40000

Capabilities: none

Modem state: Ready

Special Chars: Escape  Hold  Stop  Start  Disconnect  Activation

                ^^x    none   -     -       none        

Timeouts:      Idle EXEC    Idle Session   Modem Answer  Session   Dispatch

                never         never                        none     not set

                            Idle Session Disconnect Warning

                              never

                            Login-sequence User Response

                             00:00:30

                            Autoselect Initial Wait

                              not set

then save and reboot

HTH

Reza

[mwanzajasonalick65915]

THIS IS WHAT ITS SHOWING

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[mwanzajasonalick65915]

how do i try with different baud rates if the console in putty is unresponsive.this happened after i  reseted the switch using the mode button then set the baud rate to 1111500 .am using cisco switch 2960-s.please help

[fb_webuser]

As I run the IOS of a router from another (damaged flash memory)

My problem is this:

I have two Cisco 2800 series router, which will damage the flash memory and the other is working properly, I have tried to copy the flash from a TFTP server but you can not mark me wrong, now what I need is to run the IOS from the router it works properly without having to copy the IOS to flash. I urge and hopefully could help me with this problem. Only if you can run the IOS from another router but can not find information how.

---

Posted by WebUser Juan Francisco Ramírez Valerio from Cisco Support Community App

[mahmoodmkl]

Hi
can u check the config register if it us set correctly

Sent from Cisco Technical Support iPhone App

[mahesh18]

Hi Everyone,

I had to go to ROM ON mode and config this command set baud rate 9600

After doing this i reset the switch and then console took 9600 baud rate.

Last time during some password recovery i  changed the console speed  in ROMON  to 11500.

Thanks everyone fr help

Regards

MAhesh

[johnnylingo]

I have a 3750-E and the fix was a bit different.  Just posting this in case anyone else has the same problem.

1) Press and hold the "mode" button while reconnecting power.  Wait until you see orange light twice, then release

2) At the "switch:" prompt, enter these commands

set BAUD 9600

reset

The console setting will be set back to 9600 until the switch boots the config, at which point it will switch back to 115200.  At that point, re-connect at 115200, the enter config mode and do this:

line con 0

speed 9600

Then reconnect back at 9600, and save config:

exit

wr mem

That is the only way I was able to change the baud rate back to 9600. 

[mwanzajasonalick65915]

How do I  go to ROM ON on a cisco switch 2960-s?