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Cisco 10000 Series Router Performance Routing Engine Installation
OL-3971-03
Managing PRE Redundancy
Managing PRE Redundancy
This section explains how to manage redundant PRE failover methods.
Synchronizing PRE Configurations
You do not need to specify redundancy between PREs. If two PREs are installed in the Cisco 10000
series router, they automatically act as a redundant pair.
In the default state, redundant PREs are configured to automatically synchronize all critical files. You
can use the auto-sync command to specify which files should be synchronized.
Step 1 Select the redundancy configuration submode.
Router(config)# redundancy
Step 2 Select the main-cpu configuration submode.
Router(config-r)# main-cpu
Step 3 Specify which file or files should be autosynchronized. For example:
Router(config-r-mc)# auto-sync startup-config
Any configuration options entered in the main-cpu submode act only on the primary PRE, not on the
secondary PRE.
The following lists the options for the auto-sync command:
auto-sync [startup-config | running-config | bootvar | config-register | standard]
[no] auto-sync [startup-config | running-config | bootvar | config-register | standard]
Where:
• startup-config instructs the PREs to synchronize the startup configuration files.
Use the no form of the command to turn off startup configuration synchronization.
• running-config instructs the PREs to synchronize the running configuration files.
Use the no form of the command to turn off running-config synchronization.
• bootvar instructs the PREs to synchronize the boot variables.
Use the no form of the command to turn off boot variables synchronization.
• config-register instructs the PREs to synchronize the configuration register values.
Use the no form of the command to turn off config-register synchronization.
• standard instructs the PREs to synchronize all of the above.
Use the no form of the command to turn off all of the above auto-synchronization features.
The default for the auto-sync command is auto-sync standard.
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