Cisco Catalyst 4500 Series - Page 642

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Catalyst 4500 Series Switch Cisco IOS Command Reference—Release IOS XE 3.4.0SG and IOS 15.1(2)SG)
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Chapter 2 Cisco IOS Commands for the Catalyst 4500 Series Switches
redundancy
Command Description
auto-sync Enables automatic synchronization of the configuration files in
NVRAM.
main-cpu Enters the main CPU submode and manually synchronize the
configurations on the two supervisor engines.