Cisco Systems 78-16019-02 manual Redundant Operation Requirements

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Chapter 3 Initial Configuration

About CPU Switch Module Redundancy

Table 3-2 CPU Switch Module Software States

State

Description

 

 

Disabled

The standby CPU switch module is not yet running the system image or is in

 

maintenance mode.

 

 

Standby cold

The standby CPU switch module is running the system image but has not

 

begun to synchronize data from the active CPU switch module.

 

 

Standby hot

The standby CPU switch module has fully synchronized the configuration and

 

other data from the active CPU switch module. It will remain in the

 

hot-standby state until a switchover occurs.

 

 

Active

The CPU switch module is in the active hardware state and has completed all

 

switchover or initial bootup processing. It is fully ready to control the system.

 

 

Redundant Operation Requirements

For fully redundant operation, the following requirements must be met:

•Two CPU switch modules are required.

•The CPU switch modules must have identical hardware configurations. This includes variables such as DRAM size, and so on.

•Both CPU switch modules must have the same functional image.

•Both CPU switch modules must be running compatible system images. System images are compatible across one major release.

•Both the running and startup configurations are automatically synchronized between the CPU switch modules.

•Both CPU switch modules must be set to autoboot (a default setting).

If these requirements are met, the Cisco ONS 15530 runs in redundant mode by default. If they are not met, the system is conditionally redundant.

Note For detailed information on updating system images, see the “Updating System Images on Redundant Processors” section on page 13-14 .

Conditions Causing a Switchover from the Active CPU Switch Module

The following conditions can cause a switchover from the active CPU switch module to the standby CPU switch module:

•The active CPU switch module is removed or swapped. When the CPU switch module functioning as the active CPU switch module is removed, the standby CPU switch module takes over. The Cisco ONS 15530 is nonredundant until a second CPU switch module is inserted.

•The active CPU switch module is rebooted. When a CPU switch module functioning as the active CPU switch module is rebooted, it relinquishes its active role if the standby CPU switch module has reached the hot-standby state.

 

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 ModuleStarting Up the Cisco ONS Using the Console Ports, NME Ports, and Auxiliary PortsYou can now begin configuring the CPU switch module You see the following user Exec promptEnable Secret Password About PasswordsEnable Password Modem SupportConfiguring IP Access on the NME Interface Command PurposeDisplaying the NME Interface Configuration Switch# configure terminal Configuring the Host NameDisplaying the Operating Configurations Switchconfig# hostname name Specifies a system nameAbout NTP Switch# configure terminal Switchconfig# hostname ONS15530ONS15530# copy systemrunning-config nvramstartup-config Command Configuring NTPDisplaying the NTP Configuration Example PurposeConfiguring Authentication Configuring Security FeaturesConfiguring AAA Configuring AuthorizationConfiguring Kerberos Configuring RadiusConfiguring Passwords and Privileges Configuring TACACS+Configuring Traffic Filters and Firewalls About CPU Switch Module Redundancy CPU Switch Module State Transition Diagram State DescriptionRedundant Operation Requirements Redundancy switch-activity force Configuring CPU Switch Module RedundancyForcing a Switchover from Privileged Exec Mode Forcing a Switchover from ROM Monitor Mode SwitchoverSwitchconfig# config-register Configuring AutobootDisplaying the Autoboot Configuration Bootflash filenameFollowing example shows the contents of the boot variable Synchronizing the ConfigurationsSynchronizing Configurations Manually Switchconfig-red# no auto-sync startup-config Filename When SynchronizedSwitchconfig-red# no auto-sync running-config Enabling and Disabling Automatic SynchronizationShow redundancy summary Configuring Maintenance ModeShow redundancy running-config-file Show redundancy capabilitySwitch# show redundancy summary ExamplesFollowing example shows the CPU switch module capabilities Switch# show redundancy capabilitySwitch# redundancy reload peer Reloading the CPU Switch ModulesSby-Switch#show redundancy running-config-file Enable Switchconfig-red# standby privilege-modeEnables access to privileged Exec mode from Standby CPU switch module CLI. The default stateAbout the Software Configuration Register DownBit Number Hexadecimal Description Software Configuration Register Settings4describes each of the software configuration register bits Bit Baud Rate Boot Field ValuesBit Address nethost 7describes the values for the boot field Default System Boot BehaviorBoot Command Boot Field Value DescriptionSwitch# show version Changing the Software Configuration RegisterVerify the Configuration Register Value Displays the current configuration register valueAbout Fan Failure Shutdown Configuring Fan Failure ShutdownSwitchconfig# environment-monitor shutdown fan Displaying the Fan Tray Failure Shutdown Configuration Switch# show environment78-16019-02, Cisco IOS Release 12.218SV2
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