7.5 Perform device maintenance

7.5 Perform device maintenance

  • 7.5.a Cisco IOS upgrades and recovery (SCP, FTP, TFTP, and MD5 verify)

To use MD5 to verify an image:

R1#verify /md5 flash0:<imagename> <md5sum>

To send an image via SCP (secure copy over SSH):
Run this command from your Linux/BSD machine:

desktop$ scp <imagename> <username>@<host>:flash0:<imagename>

To copy via FTP/TFTP:

R1#: copy ftp://username:pass@<host>/path flash
R1#: copy ftpt://<host>/path flash
  • 7.5.b Password recovery and configuration register

 
1.) Remove power
2.) Remove flash memory
3.) Turn on router
4.) Configure ROMMON

rommon 1> 0x2142

5.) Turn off router
6.) Restore flash and power
7.) Router will boot with no config:

Router> enable
Router#copy startup-config running-config
R1#configure terminal
R1(config)#enable secret password
R1(config)#config-reg 0x2102
R(config)#^Z

8.) copy new password to startup-config

R1# copy running-config startup-config

 

  • 7.5.c File system management

 
To copy files to a USB drive:

R1# copy running-config usbflash1:copy-of-run-config

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