Specifications

Route Switch Processor (RSP8) Installation and Configuration Guide

OL-4920-02

Reference Information

• To recover a lost password

• To allow you to manually boot the system using the b command at the bootstrap program prompt

• To force the router to boot automatically from the system bootstrap software (boot image) or from

its default system image in onboard Flash memory, and to read any boot system commands that are

stored in the configuration file in NVRAM

If the router finds no boot system commands, it uses the configuration register value to form a filename

from which to boot a default system image stored on a network server. (See Table 11.)

Table 9 lists the meaning of each of the software configuration memory bits, and Table 10 defines the

boot field.

Caution To avoid confusion and possibly halting the router, remember that valid configuration register settings

might be combinations of settings and not just the individual settings listed in Table 9. For example, the

factory default value of 0x0102 is a combination of settings.

Table 9 Software Conﬁguration Register Bit Meanings

Bit Number

1. The factory default value for the configuration register is 0x0102. This value is a combination of the following: bit 8 =

0x0100 and bits 00 through 03 = 0x0001 (see Table 11).

Hexadecimal Meaning

00 to 0F 0x0000 to 0x000F Boot field (see Table 10)

06 0x0040 Causes system software to ignore NVRAM contents

07 0x0080 OEM

bit enabled

2. OEM = original equipment manufacturer

08 0x0100 Break disabled

09 0x0200 Use secondary bootstrap

10 0x0400 IP broadcast with all zeros

11 to 12 0x0800 to 0x1000 Console line speed (default is 9600 baud)

13 0x2000 Boot default Flash memory software if network boot fails

14 0x4000 IP broadcasts do not have network numbers

15 0x8000 Enable diagnostic messages and ignore NVRAM contents

Table 10 Explanation of Boot Field (Software Conﬁguration Register Bits 00 to 0F)

Boot Field Meaning

00 Stays at the system bootstrap prompt

01 Boots the first system image in onboard Flash memory

02 to 0F Specifies a default network boot filename

Enables boot system commands that override the default network boot filename