[라우터/스위치] Config-register 0x2101

L3 스위치 IOS이미지를 Upgrade를 하고, Boot System 명령어 통해 부팅 시 이용할 이미지 순서도 정상적으로 지정했는데, 업그레이드한 이미지로 부팅이 안 되는 문제가 발생했다.

이미지도 에러 없이 정상적으로 Upload되었고, 업로드된 파일 사이즈도 점검했는데 TFTP 서버에 올려놓았던 이미지 파일과 동일 사이즈인데... 왜 부팅이 안되나 계속 확인을 해보다가.

Config-register값이 0x2101로 되어 있음을 확인하였다.

이때문에 지정한 이미지로 부팅을 하지 않고, bootflash 내 첫 번째 이미지를 이용해서 Autobooting을

계속하게 되었다.

Config-register값을 0x2102로 바꾼 뒤에는 정상적으로 원하는 이미지로 부팅이 되어 이후 작업을 진행할 수 있었다.

구글링을 해보면 여러 설명들이 많이 나오는데, 아래가 가장 간단히 설명되어 있는것 같아 참고용으로 첨부 한다.

If boot field = 0, use the ROMMON OS.
If boot field = 1, load the first IOS file found in flash memory.
If boot field = 2-F:
A. Try each boot system command in the startup-config file, in order, until one works.
B. If none of the boot system commands work, load the first IOS file found in flash memory.

config-register = 0x2101

 

Autobooting using the first file from bootflash.....

 

hostname TEST_C4503E_BB_A

!

boot-start-marker

boot system flash bootflash:cat4500es8-universalk9.SPA.03.11.03a.E.152-7.E3a.bin

boot system flash bootflash:cat4500es8-universal.SPA.03.03.00.XO.151-1.XO.bin

boot-end-marker

 

TEST_C4503E_BB_A#reload

Proceed with reload? [confirm]

*Oct 20 08:50:03.617: %SYS-5-RELOAD: Reload requested by console. Reload Reason: Reload command.

*Oct 20 08:50:03.783: %HSRP-5-STATECHANGE: GigabitEthernet3/46 Grp 60 state Standby -> Init

*Oct 20 08:50:03.783: %HSRP-5-STATECHANGE: Vlan70 Grp 70 state Standby -> Init

*Oct 20 08:50:03.783: %HSRP-5-STATECHANGE: Vlan100 Grp 100 state Stand

by -> Init

*Oct 20 08:50:03.783: %HSRP-5-STATECHANGE: Vlan150 Grp 150 state Standby -> Init

*Oct 20 08:50:03.783: %HSRP-5-STATECHANGE: Vlan200 Grp 200 state Standby -> Init

*Oct 20 08:50:03.783: %HSRP-5-STATECHANGE: Vlan210 Grp 210 state Standby -> Init

*Oct 20 08:50:03.783: %HSRP-5-STATECHANGE: Vlan220 Grp 220 state Standby -> Init

*Oct 20 08:50:03.783: %HSRP-5-STATECHANGE: Vlan230 Grp 230 state Standby -> Init

<Tue Oct 20 08:50:03 2020> Message from sysmgr: Reason Code:[3] Reset Reason:Reset/Reload requested by [console]. [Reload command]

FAILURE: syslogd shutdown

FAILURE: rpc.mountd shutdown

FAILURE: nfsd shutdown

/bin/kill: 11347: No such process

/bin/kill: 11348: No such process

/bin/kill: 11455: No such process

/bin/kill: 11456: No such process

/etc/rc6.d/S01reboot: line 198: umount_cisco_filesystems: command not found

Please stand by while rebooting the system...

Restarting system.

 

 

Verifying FPGA (P) Signature ....................... PASSED

Verifying ROMMON (P) Signature ......... PASSED

 

 

************************************************************

*                                                          *

* Rom Monitor                                              *

* Copyright (c) 2012-2014 by Cisco Systems, Inc.           *

* All rights reserved.                                     *

*                                                          *

************************************************************

 

Rom Monitor (P) Version 15.1(1r)SG5

Compiled Thu 06-Nov-14 22:58 [RLS]

 

System       : WS-X45-SUP8-E  Slot [1]

Chassis      : WS-C4503*E     Mod  [2][3]

Revision     : CPU 2.1   BOARD 4.0   FPGA 3.2978.834F

Memory       : 4096 MB

Date         : Tue Oct 20 08:50:46 2020

***** The system will autoboot in 5 seconds *****

Type Control-C to prevent autobooting....

. . . . .

 

config-register = 0x2101

 

Autobooting using the first file from bootflash.....

 

Loading image !!!!!!!!!!!!!!!!!!!!

 

Checking digital signature....

[bootflash:/cat4500es8-universal.SPA.03.03.00.XO.151-1.XO.bin]

Digitally Signed Release Software with key version A