System initialization

The primary copy of SR OS software is located on a compact flash card. The removable media is shipped with each router and contains a copy of the OS image.

Note:

Starting a router begins with hardware initialization (a reset or power cycle). By default, the system searches Compact Flash Slot #3 (cf3) for the boot.ldr file (also known as the bootstrap file). The boot.ldr file is the image that reads and executes the system initialization commands configured in the boot option file (BOF). The default value to initially search for the boot.ldr file on cf3 cannot be modified.

The following is an example of a console display output when the boot.ldr file cannot be located on cf3.

... 
(memory test messages) 
(serial number information) 
Searching for boot.ldr on local drives:
No disk in cf3
No disk in cf3
No disk in cf3
Error - file boot.ldr not found on any drive
Please insert CF containing boot.ldr. Rebooting in 5 seconds. 

When the bootstrap image is loaded, the BOF is read to obtain the location of the image and configuration files. The BOF must be located on the same compact flash drive as the boot.ldr file.

Figure: System initialization - part 1 displays the system initialization sequence. In the figure, ‟A” refers to Figure: Files on the compact flash, and ‟B” refers to the list of files on the compact flash.

Figure: System initialization - part 1

Figure: Files on the compact flash displays the compact flash directory structure and filenames for the multislot models.

Figure: Files on the compact flash

Files on compact flash are:

Figure: Files on the compact flash (1-slot and 1-slot non-redundant) displays the compact flash directory structure and filenames for the 1-slot models (7750 SR-1 and 7750 SR-1s).

Figure: Files on the compact flash (1-slot and 1-slot non-redundant)

Files on the compact flash (1-slot models) are:

The 7750 SR includes a boot option for running the node in a FIPS-140-2 mode. This mode limits the use of cryptographic algorithms on the CPM to only those that are in accordance with the FIPS-140-2 certifications associated with the 7750 SR.