Cisco Systems 78-16019-02 manual Default System Boot Behavior, Boot Command

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Chapter 3 Initial Configuration

About the Software Configuration Register

Table 3-7describes the values for the boot field.

Table 3-7 Configuration Register Boot Field Values

Boot Field Value

Description

 

 

 

0x0

(0-0-0-0)

Stays at the system bootstrap prompt. You must boot the operating

 

 

system manually by giving a boot command to the ROMMON system

 

 

bootstrap environment.

 

 

 

0x1

(0-0-0-1)

Boots the first system image in onboard Flash SIMM. If the boot fails,

 

 

the system stops booting and remains in ROMMON mode.

 

 

 

0x2

(0-0-1-0) to 0xF (1-1-1-1)

Loads the system image specified by boot system commands in the

 

 

startup configuration file. When the startup configuration file does not

 

 

contain boot system commands, the system tries to load the first

 

 

system image stored on the Flash memory device in slot 0. If that

 

 

attempt fails, the system tries to boot with the first system image in

 

 

bootflash. If that also fails, the system stops booting and remains in

 

 

ROMMON mode.

 

 

The factory default is 0x2.

 

 

 

Default System Boot Behavior

The factory default value for the configuration register on the Cisco ONS 15530 is 0x2102. When the system boots, the following occurs:

•The system attempts to load the system images specified in the boot system commands in the startup configuration file. If no boot system commands are configured, the system attempts to load the first system image stored on the Flash memory device in slot 0.

•The console Break key sequence, or break signal, is disabled and the system ignores it while rebooting.

Note Regardless of the setting of the break enable bit, a break causes a return to the ROMMON during the first few seconds (approximately five seconds) of booting.

•After five failed attempts to load a system image on the Flash memory device in slot 0, the system loads the first system image from Flash memory. If that attempt fails, the system stays in ROMMON mode.

Boot Command

You can enter only the boot command, or you can include additional boot instructions, such as the name of a file stored in Flash memory or a file that you specify for booting from a network server.

If you use the boot command without specifying a file or any other boot instructions, the system boots using the default system image (the first system image in onboard Flash memory). Otherwise, you can instruct the system to boot from a specific system image in Flash memory (using the boot filename command) or by sending a direct TFTP request to a specific server (using the boot filename ip-addresscommand).

For more information on system booting, see Chapter 13, “Managing Your Cisco ONS 15530 System.”

 

Cisco ONS 15530 Configuration Guide and Command Reference

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78-16019-02, Cisco IOS Release 12.2(18)SV2

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Contents Initial Configuration About the CPU Switch ModuleUsing the Console Ports, NME Ports, and Auxiliary Ports You can now begin configuring the CPU switch moduleStarting Up the Cisco ONS You see the following user Exec promptAbout Passwords Enable PasswordEnable Secret Password Modem SupportConfiguring IP Access on the NME Interface Command PurposeDisplaying the NME Interface Configuration Configuring the Host Name Displaying the Operating ConfigurationsSwitch# configure terminal Switchconfig# hostname name Specifies a system nameONS15530# copy systemrunning-config nvramstartup-config Switch# configure terminal Switchconfig# hostname ONS15530About NTP Configuring NTP Displaying the NTP ConfigurationCommand Example PurposeConfiguring Security Features Configuring AAAConfiguring Authentication Configuring AuthorizationConfiguring Kerberos Configuring RadiusConfiguring Traffic Filters and Firewalls Configuring TACACS+Configuring Passwords and Privileges About CPU Switch Module Redundancy CPU Switch Module State Transition Diagram State DescriptionRedundant Operation Requirements Forcing a Switchover from Privileged Exec Mode Configuring CPU Switch Module RedundancyRedundancy switch-activity force Forcing a Switchover from ROM Monitor Mode SwitchoverConfiguring Autoboot Displaying the Autoboot ConfigurationSwitchconfig# config-register Bootflash filenameSynchronizing Configurations Manually Synchronizing the ConfigurationsFollowing example shows the contents of the boot variable Filename When Synchronized Switchconfig-red# no auto-sync running-configSwitchconfig-red# no auto-sync startup-config Enabling and Disabling Automatic SynchronizationConfiguring Maintenance Mode Show redundancy running-config-fileShow redundancy summary Show redundancy capabilitySwitch# show redundancy summary ExamplesFollowing example shows the CPU switch module capabilities Switch# show redundancy capabilitySby-Switch#show redundancy running-config-file Reloading the CPU Switch ModulesSwitch# redundancy reload peer Switchconfig-red# standby privilege-mode Enables access to privileged Exec mode fromEnable Standby CPU switch module CLI. The default stateAbout the Software Configuration Register Down4describes each of the software configuration register bits Software Configuration Register SettingsBit Number Hexadecimal Description Bit Address nethost Boot Field ValuesBit Baud Rate Default System Boot Behavior Boot Command7describes the values for the boot field Boot Field Value DescriptionChanging the Software Configuration Register Verify the Configuration Register ValueSwitch# show version Displays the current configuration register valueSwitchconfig# environment-monitor shutdown fan Configuring Fan Failure ShutdownAbout Fan Failure Shutdown Displaying the Fan Tray Failure Shutdown Configuration Switch# show environment78-16019-02, Cisco IOS Release 12.218SV2
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