You have successfully configured a router, but it prompts you to run Setup mode every time the router is restarted. Based on the following output, what could be
causing this problem?
RouterA# show version
Cisco Internetwork Operating System SoftwareIOS ™ 2500 Software (C2500-JS-L), Version 11.3(6), RELEASE SOFTWARE (fc1)
Copyright 1986-1998 by Cisco Systems, Inc.
Compiled Tue 06-Oct-98 22:17 by kpma
Image text-base: 0x03048CF4, data-base: 0x00001000
ROM: System Bootstrap, Version 5.2(8a), RELEASE SOFTWARE
BOOTFLASH: 3000 Bootstrap Software (IGS-RXBOOT), Version 10.2(8a), RELEASE SOFTWARE (fc1)
RouterA uptime is 25 minutes
System restarted by power-on
System image file is “flash:c2500-js-l_113-6.bin”, booted via flash
Cisco 2500 (68030) processor (revision D) with 4096K/2048K bytes of memory.
Processor board ID 04203139, with hardware revision 00000000
Bridging software.
X.25 software, Version 3.0.0.
SuperLAT software copyright 1990 by Meridian Technology Corp).
TN3270 Emulation software.
2Ethernet/IEEE 802.3 interface(s)
2 Serial network interface(s)
32K bytes of non-volatile configuration memory.
16384K bytes of processor board System flash (Read ONLY)
Configuration register is 0x2142
A.
The router does not have sufficient flash memory.
B.
The configuration register is incorrect.
C.
The configuration file could not be found in NVRAM.
D.
The router could not locate a configuration file over the network.
Explanation:
The configuration register is incorrect. The configuration register value of 2142 is preventing the router from loading the configuration file from NVRAM.
The router configuration register is used to control various aspects of the router boot sequence, and defaults to a value of 2102. A configuration register of2102
indicates that the router should boot normally, which consists of loading the Internetwork Operating System (IOS) into RAM, then loading the saved configuration file
from Non-Volatile RAM (NVRAM) to configure the router.
Changing the configuration register to 2142 tells the router to bypass the saved configuration in NVRAM. This causes the router to boot with a default running
configuration, and prompt to run the Initial Configuration Dialog (or Setup mode). Changing the configuration register to 2142is necessary to perform password
recovery or to bypass any other aspect of a saved configuration that might be causing problems. After the situation is resolved, the configuration register would then
be changed back to the default of 2102 with the following command:
Router(config)# config-register 0x2102
The router is successfully loading the IOS from flash memory, so insufficient flash memory is an incorrect answer.
The configuration register is instructing the router to bypass the configuration file in NVRAM, so it is incorrect to state that the configuration file could not be found in
NVRAM.
The configuration register is instructing the router to bypass the configuration file in NVRAM, so it is incorrect to state that the router could not locate a configuration
file over the network.
Objective:
Infrastructure Maintenance
Sub-Objective:
Use Cisco IOS tools to troubleshoot and resolve problemshttps://www.cisco.com/c/en/us/support/docs/routers/10000-series-routers/50421-config-register-use.html
https://www.cisco.com/c/en/us/td/docs/ios/fundamentals/command/reference/cf_book/cf_c1.html#wp1068966