Can not change the configuration-register of c2600

[adayoub]

On my c2600 router the existing config-register is “0x2122”

I tried to change it to the default value which is 0x2102 using the command Router(config)#config-register 0x2102 the router takes the command but wont change to 0x2102. I also tried rommon 1>confreg 0x2102 but it won’t change... What shall I do? Please help.

Thanks

[Harold Ritter]

Can you do a "show ver" after you change the config-register and see if it gives you the following message at the end.

Configuration register is 0x2122 (will be 0x2102 at next reload)

Thanks,

[adayoub]

Thanks for your response. the message says that configuration register will be 0x2122 at next reload.

[bbohan]

Hello adayoub & hritter,

I have several 2600's that we deploy and reuse for our customer's and I have been experiencing the same issue. I would be interested in the resolution myself. I have done the same tests as adayoub with the same results.

[Harold Ritter]

You can't change the config-register from 0x2122 to 0x2102 probably because the speed is set on "line con 0".

Remove the speed statement and you will be able to change the config-register.

Hope this helps,

[bbohan]

Thanks hritter,

I'll try that tomorrow morning and let you know how I make out.

Brad

[adayoub]

Can please explain more how to do that! Many thanks for your help.

[Harold Ritter]

Preferably from a telnet session:

RTR1#config t

Enter configuration commands, one per line. End with CNTL/Z.

RTR1(config)#line con 0

RTR1(config-line)#speed 9600

RTR1(config-line)#config-register 0x2102

RTR1(config)#end

RTR1#sh ver

Cisco Internetwork Operating System Software

IOS (tm) C2600 Software (C2600-I-M), Version 12.3(10), RELEASE SOFTWARE (fc3)

.......

(Read/Write)

Configuration register is 0x2122 (will be 0x2102 at next reload)

RTR1#

Hope this helps,

[adayoub]

Thank you so much, with your help I finally got it to work. I do personally appreciate your help. Thank you again.

[adayoub]

I can only consol to the router at the speed of 19200bps because of the value 0x2122. Once I consol I can not change the configuration register and the router interfaces can not communicate with the neighboring router interfaces.

Thanks

[Harold Ritter]

If you perform this procedure, you need to change the terminal emulation or the terminal server line speed from 19200 to 9600 after changing the "line con 0" speed.

Hope this helps,

[Harold Ritter]

Sorry for the confusion. What I meant to say in my previous post was, If you perform this procedure via the console port.

Hope this helps,