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Cisco 10000 Series Router Performance Routing Engine Installation

OL-3971-03

Managing System Boot Parameters

Table 3 Deﬁnition of Bits in the Software Conﬁguration Register

Bit No. Hex Value Meaning/Function

00 to 03 0x0000 to 0x000F Defines the source of a default Cisco IOS software image required to run the router:

• 00—At power-on, the system remains at the ROM monitor prompt (rommon>),

awaiting a user command to boot the system manually by means of the rommon

boot command.

• 01—At power-on, the system automatically boots the first system image found in

the Flash memory single inline memory module (SIMM) on the PRE.

• 02 to 0F—At power-on, the system automatically boots from a default Cisco IOS

software image stored on a TFTP server in the network. For this setting, the Fast

Ethernet port on the PRE must be configured and operational. This setting also

enables boot system commands that override the default filename.

06 0x0040 Causes system software to ignore the contents of NVRAM.

07 0x0080 Enable the original equipment manufacturer (OEM) bit.

08 0x0100 The Break function is disabled after 30 seconds.

09 0x0200 Not used.

10 0x0400 Broadcast based on 0.0.0.0 IP address.

11 and 12 0x0800 to 0x1000 Defines the console baud rate (the default setting is 9600 baud).

13 0x2000 Boots an image from the Flash SIMM.

14 0x4000 Broadcast using the subnet broadcast address.

15 0x8000 Enables diagnostic messages and ignores the contents of NVRAM.

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