The old.text has not been read by the switch as a valid configuration file, therefore doesn’t ask for credentials. Switch: reset -reboots the switch with the renamed conf.text file. Switch: rename flash:conf.text flash:old.text -renames conf.text to old.text to avoid being detected as a valid configuration file at boot up. Switch: dir flash: -shows contents of flash directory Switch: dir -shows directories located on the switch Switch: flash_init -initialises the flash memory in the recovery mode. MODE button can be located on different places depending on the model of the switch. To access the recovery mode it is required to reboot the switch and hold the MODE button during the boot up until the Putty session returns command prompt switch: which means that the switch is in the recovery mode and the file system is marginally accessible. The only way to have any access to the filesystem is to enter switch’s recovery mode. By renaming the conf.text the switch will not rercognise it as a valid start-up configuration file. There’s a technique to prevent conf.text from booting at the start and prompting the user for credentials. The login credentials are located within conf.text file in flash memory of the switch, however without the credentials conf.text cannot be accessed. The first PoE switch required some credentials to login. Its usage in this demonstration is described later on. 3CDaemon is usually used by network admins for FTP and TFTP servers or clients. To find the channel number visit Computer Manager or Device Manager on newer Windows machines.ģCDAEMON is utilised to transfer the new IOS image into the switch via switch’s TFTP server. That should open up an empty command-line type window.
CISCO 3750 FIRMWARE UPGRADE SERIAL
To establish the connection open up Putty, choose a Serial connection, keep the speed default and write appropriate channel number of the serial connection and hit Open. Putty is a simple to use tool, usually utilised to establish SSH or Telnet communication to remote systems.
![cisco 3750 firmware upgrade cisco 3750 firmware upgrade](https://www.cisco.com/c/dam/en/us/support/web/images/series/switches-catalyst-3750-series-switches.jpg)
PUTTY.EXE is used to create a serial connection between the laptop and the switch.
![cisco 3750 firmware upgrade cisco 3750 firmware upgrade](https://oasysadmin.files.wordpress.com/2012/09/pic3.jpg)
The console cable has to be converted to a USB cable with a serial to USB converter. Of course power on the right side and a console cable on the left. The initial connections have to be established to the first switch to begin this test.
![cisco 3750 firmware upgrade cisco 3750 firmware upgrade](https://i.stack.imgur.com/txR9c.jpg)
CISCO 3750 FIRMWARE UPGRADE SOFTWARE
The demonstration utilises various types of hardware and software all described further in the post. This post demonstrates an Internetwork Operating System (IOS) replacement on a Cisco 3750 48-Port Layer 3 switch.