September 16, 2009

Cisco IOS Configuration boot register - ROMMON

Every cisco routers has a configuration register which is saved in NVRAM and is a 16 bit value. This post will not tackle all the 16 bits of the configuration register, but only the 13th bit which is used to either load IOS or ROMMON. Another post will be made to detail all the 16 bit configuration register. Before continuing, it is important to understand the basic “boot process” of a router. ... Read more