ECE495 Chapter Notes - Chapter 3: Cisco Discovery Protocol, Name Server, Trivial File Transfer Protocol
6 Apr 2016
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The configuration register (config-register) is a hexadecimal value that controls various aspects of how a router boots, including: baud rate, boot messages (enable/disable, break (disable/ignore, flash (read-only, read-write, nvram (use startup-config/bypass startup-config) To view your router"s current config- register setting: 16384k bytes of processor board system flash (read only) Remember, 0x2102 is the default config-register value on cisco routers. In order to upgrade the cisco ios, the config-register must be changed to. 0x2101, so that the flash memory becomes writeable. This configuration change does not take affect until the next reboot. (reference: http://www. cisco. com/en/us/products/hw/routers/ps133/products_tech_note09186a008022493f. shtml) Multiple ios files can be loaded into flash, assuming there is enough free space. You can view available free space, and the name of any file(s) in flash, by typing: 16384k bytes of processor board system flash (read/write) To backup the ios, a tftp server is required. To backup the ios file from the router"s flash to the tftp server:
