Cisco 2525 Guia do Utilizador descarregar pdf (Página 134)

A-22 Cisco 2524 and Cisco 2525 Router User Guide

Virtual Configuration Register Settings

Virtual Conﬁguration Register Bit Meanings

The lowest four bits of the virtual conﬁguration register (bits 3, 2, 1, and 0) form the boot

ﬁeld. (See Table A-3.) The boot ﬁeld speciﬁes a number in binary form. If you set the boot

ﬁeld value to 0, you must boot the operating system manually by entering the b command

at the bootstrap prompt, as follows:

> b [tftp] flash filename

The b command options are as follows:

• b—Boots the default system software from ROM

• b ﬂash—Boots the first file in Flash memory

• b ﬁlename [host]—Boots from the network using a TFTP server

• b ﬂash [ﬁlename]—Boots the ﬁle ﬁlename from Flash memory

For more information about the command b [tftp] ﬂash ﬁlename, refer to the

Router Products Conﬁguration Guide publication for Cisco IOS Release 11.0 and earlier

releases. Refer to the Conﬁguration Fundamentals Conﬁguration Guide publication for

Cisco IOS Release 11.1 and later releases.

If you set the boot ﬁeld value to a value of 0x2 through 0xF, and a valid system boot

command is stored in the conﬁguration ﬁle, the router boots the system software as directed

by that value. If you set the boot ﬁeld to any other bit pattern, the router uses the resulting

number to form a default boot ﬁlename for booting from the network using a TFTP server.

(See Table A-4.)

Table A-4 Default Boot Filenames

Action or Filename Bit 3 Bit 2 Bit 1 Bit 0

bootstrap mode 0 0 0 0

ROM software 0 0 0 1

cisco2-igs 0 0 1 0

cisco3-igs 0 0 1 1

cisco4-igs 0 1 0 0

cisco5-igs 0 1 0 1

1 2 ... 129 130 131 132 133 134 135 136 137 138 139 ... 165 166

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