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Software Configuration Guide—Release 12.2(20)EW
78-16453-01 A1
Chapter 6 Configuring Supervisor Engine Redundancy on the Catalyst 4507R and 4510R Switches
Synchronizing the Supervisor Engine Configurations
client count = 4
client_notification_TMR = 30000 milliseconds
keep_alive TMR = 4000 milliseconds
keep_alive count = 1
keep_alive threshold = 7
RF debug mask = 0x0
Switch#
Synchronizing the Supervisor Engine Configurations
During normal operation, the startup-config, boot variables, config-registers, and VLAN database
configuration are synchronized by default between the two supervisor engines. In a switchover, the new
active supervisor engine uses the current configuration.
To manually synchronize the configurations used by the two supervisor engines, perform this task on the
active supervisor engine:
Note The auto-sync command controls the synchronization of the CONFIG-REG, BOOTVAR and
STARTUP/PRIVATE configuration files only. The calendar and vlan database files are always
synchronized when they change.
This example shows how to reenable the default automatic synchronization feature using the auto-sync
standard command to synchronize the startup-config and config-register configuration of the active
supervisor engine with the standby supervisor engine: updates for the boot variables are automatic and
cannot be disabled.
Switch(config)# redundancy
Switch(config-red)# main-cpu
Switch(config-r-mc)# auto-sync standard
Switch(config-r-mc)# end
Switch# copy running-config startup-config
Note To manually synchronize individual elements of the standard auto-sync configuration, disable the default
automatic synchronization feature.
Command Purpose
Step 1
Switch(config)# redundancy
Enters redundancy configuration mode.
Step 2
Switch(config-red)# main-cpu
Enters main-cpu configuration submode.
Step 3
Switch(config-r-mc)# auto-sync {startup-config |
config-register | bootvar | standard}
Synchronizes the configuration elements.
Step 4
Switch(config-r-mc)# end
Returns to privileged EXEC mode.
Step 5
Switch# copy running-config startup-config
Forces a manual synchronization of the configuration
files in NVRAM.
Note This step is not required to synchronize the
running configuration file in dynamic
random-access memory (DRAM).
