Cisco-Linksys E4200 Router: Cisco Certification

Review Cisco Router Boot Sequence

Here we are going to discuss from a high level of how a Cisco Router boots after you flip the power switch to on which will support you in your Ccna studies. For the most part, the introductory boot process is controlled by the BootRom which constantly shop the startup diagnostic code(Rom Monitor). The main task of the BootRom is to run the Power On Self Test(Post), which are the hardware diagnostics, and to load the Cisco Ios software from the Flash(in most cases) to memory. Note that the Boot Rom is not erasable.

Cisco Router

1. The BootRom will initialize the hardware and run through the Post to make sure there are no hardware errors and the Cpu and interfaces are all fully functioning. If there is some sort of error, you will see it in the Post as the router begins to boot

Cisco Certification - How a Cisco Router Boots
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2. Next the BootRom locates and loads a valid Cisco Ios image. Below you will find the process that the router will go through to load the Ios image:

The router first checks the Flash for a valid Ios. If there is none found in Flash and it has a isolate Boot-Helper image, it can load the Ios via a Tftp server(netboot) Finally, as a last resort it will load the RxBoot mini-Ios that is found in Rom.
3. The router then checks the Configuration Register value (Nvram) to see where to load the router configuration file from. By default this is stored on an Eprom named startup-config which does not lose its contents when the router is powered off. If a valid startup-config file cannot be found, the router will load the theory Configuration Dialog, which basically drops you into Setup mode. Then you will be able to perform the introductory configuration of the router via a menu. Finally, there are assorted configuration-register options you can set to convert the default behavior which will be covered in other article.

Cisco-Linksys E4200 Router

Wednesday, May 4, 2011

Cisco Certification - How a Cisco Router Boots

Cisco Router

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