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Community Member

Config register..

This router was reloaded by Abort as shown in "sh ver", but what we don't understand why it changed its config-register, nobody changed that..

"Configuration register is 0x2102 (will be 0x3922 at next reload)"


Cisco Internetwork Operating System Software

IOS (tm) 3600 Software (C3640-IS-M), Version 11.3(8)T1, RELEASE SOFTWARE (fc1)

Copyright (c) 1986-1999 by cisco Systems, Inc.

Compiled Thu 11-Feb-99 14:55 by ccai

Image text-base: 0x60008918, data-base: 0x608BA000

ROM: System Bootstrap, Version 11.1(20)AA1, EARLY DEPLOYMENT RELEASE SOFTWARE (fc1)

XXXXXXXX uptime is 10 weeks, 6 days, 15 hours, 8 minutes

System restarted by abort at PC 0x60240628 at 23:07:35 est Thu May 16 2002

System image file is "flash:flash:c3640-is-mz.113-8.T1", booted via flash

cisco 3640 (R4700) processor (revision 0x00) with 24576K/8192K bytes of memory.

Processor board ID 12407795

R4700 processor, Implementation 33, Revision 1.0

MICA-6DM Firmware: CP ver 2017 - 9/29/1997, SP ver 2017 - 9/29/1997.

Bridging software.

X.25 software, Version 3.0.0.

Primary Rate ISDN software, Version 1.1.

2 FastEthernet/IEEE 802.3 interface(s)

24 Serial network interface(s)

48 terminal line(s)

2 Channelized T1/PRI port(s)

DRAM configuration is 64 bits wide with parity disabled.

125K bytes of non-volatile configuration memory.

8192K bytes of processor board System flash (Read/Write)

2048K bytes of processor board PCMCIA Slot0 flash (Read/Write)

Configuration register is 0x2102 (will be 0x3922 at next reload)

Cisco Employee

Re: Config register..

Try this and let me know how it goes

router#config t

router(config)#line console 0

router(config-line)# speed 9600

router(config-line)# end

router#copy run start


Community Member

Re: Config register..

I've had a look at the binary breakdown of both config-registers, and the breakdown is as follows:

0x2102 = 0010 0001 0000 0010

0x3922 = 0011 1001 0010 0010

As you can see the only bits that have changed is bits 5, 11, 12. (taking right-most bit as 0 and left-most as 15). If you then have a look at the Cisco documentation, these bits relate to the console speed. In the case of 0x2102, the bit order of bits 12, 11 and 5 is 000 which means the console speed is set to 9600 (normal). However, in the case of 0x3922, the bit order is 111 which means the console speed is set to 115200! If I was you, I would set the config-register back to 0x2102 and reload the box. Alternatively, check the speed of your console port on the router via the 'show line console 0' command from enable mode and ensure that it is set for 9600 - if not change it to 9600!

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