Cisco Systems 78-16019-02 manual About CPU Switch Module Redundancy

Page 12

Chapter 3 Initial Configuration

About CPU Switch Module Redundancy

Refer to the “Configuring Passwords and Privileges” part in the Cisco IOS Security Configuration Guide.

About CPU Switch Module Redundancy

The Cisco ONS 15530 supports fault tolerance by allowing the standby CPU switch module to take over if the active CPU switch module fails. This standby, or redundant, CPU switch module runs in hot-standby state. In hot-standby state, the standby CPU switch module is partially booted with Cisco IOS software, but no configuration is loaded.

At the time of a switchover from the active CPU switch module, the standby CPU switch module becomes active and loads the configuration as follows:

•If the running configuration file on the active and standby CPU switch modules match, the new active CPU switch module uses the running configuration file.

•If the running configuration file on the new active CPU switch module is missing or invalid, the new active CPU switch module uses the startup configuration file in its NVRAM (not the NVRAM of the former active CPU switch module).

The former active CPU switch module then reloads and becomes the standby CPU switch module.

Note If the standby CPU switch module is unavailable, the system reports a minor alarm. Use the show facility-alarm status command to display the redundancy alarm status.

When the Cisco ONS 15530 is powered on, the two CPU switch modules arbitrate to determine which is the active CPU switch module and which is the standby CPU switch module. The following rules apply during arbitration:

•A newly inserted CPU switch module always comes up as the standby CPU switch module, except in cases where the newly inserted card is the only one present.

•If one of the CPU switch modules cannot boot its software image, the redundant CPU switch module boots as the active CPU switch module, allowing you to correct the situation manually.

•The primary route processor at the time the system is powered off continues as the primary when the system is powered on.

•If none of the above conditions is true, the CPU switch module in slot 6 becomes the active CPU switch module.

During normal operation, the active CPU switch module boots completely. The standby CPU switch module partially boots, stopping short of parsing the configuration. From this point, the active and standby CPU switch modules communicate periodically to synchronize any system configuration changes.

Table 3-1describes the five CPU switch module hardware states.

 

Cisco ONS 15530 Configuration Guide and Command Reference

3-12

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

Page 11 Page 13
Image 12
Page 11 Page 13
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 nameSwitch# configure terminal Switchconfig# hostname ONS15530 ONS15530# copy systemrunning-config nvramstartup-configAbout NTP Configuring NTP Displaying the NTP ConfigurationCommand Example PurposeConfiguring Security Features Configuring AAAConfiguring Authentication Configuring AuthorizationConfiguring Kerberos Configuring RadiusConfiguring TACACS+ Configuring Traffic Filters and FirewallsConfiguring Passwords and Privileges About CPU Switch Module Redundancy CPU Switch Module State Transition Diagram State DescriptionRedundant Operation Requirements Configuring CPU Switch Module Redundancy Forcing a Switchover from Privileged Exec ModeRedundancy switch-activity force Forcing a Switchover from ROM Monitor Mode SwitchoverConfiguring Autoboot Displaying the Autoboot ConfigurationSwitchconfig# config-register Bootflash filenameSynchronizing the Configurations Synchronizing Configurations ManuallyFollowing 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 capabilityReloading the CPU Switch Modules Sby-Switch#show redundancy running-config-fileSwitch# 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 DownSoftware Configuration Register Settings 4describes each of the software configuration register bitsBit Number Hexadecimal Description Boot Field Values Bit Address nethostBit 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 valueConfiguring Fan Failure Shutdown Switchconfig# environment-monitor shutdown fanAbout Fan Failure Shutdown Displaying the Fan Tray Failure Shutdown Configuration Switch# show environment78-16019-02, Cisco IOS Release 12.218SV2
Top Page Image Contents