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Cisco 4700 Series Application Control Engine Appliance Administration Guide
OL-11157-01
Chapter 7 Configuring Redundant ACE Appliances
Configuring Redundancy
Synchronizing Redundant Configurations
To ensure that the running configurations on both the active and the standby
contexts of an FT group are identical, the ACE automatically synchronizes the
running configurations between the two contexts. After the active context has
accepted either a new configuration or modifications to an existing configuration,
the ACE automatically applies the new configuration or configuration changes to
the standby context.
The ACE supports the following two types of configuration synchronizations:
•
Bulk config sync—Synchronizes the entire active context configuration to the
standby context when the peer comes up or when autosynchronization is
enabled
•
Dynamic config sync—Synchronizes the configuration applied to the active
context to the standby context if the peer is already up
To enable automatic synchronization of the running-configuration and the
startup-configuration files, use the
ft auto-sync
command in configuration mode.
If you temporarily disable
ft auto-sync running-config
on the active ACE (for
example, to test changes to your configuration), when you subsequently reenable
config sync, any changes that you made to the active ACE are duplicated on the
standby ACE. Note that the standby ACE remains in the STANDBY_HOT state
even when config sync is disabled on the active ACE. (For more information about
FT states, see
Table 7-2
). If you operate the active ACE with config sync disabled
for a prolonged period of time, you must manually duplicate any changes that you
make to the active ACE on the standby ACE to ensure that connection replication
works properly.
Note
If a license mismatch occurs between the two ACEs in a redundant configuration,
the
auto-sync
command is automatically disabled and a syslog message is
generated.
The syntax of this command is:
ft auto-sync
{
running-config
|
startup-config
}
