Cisco ACE-4710-K9 Administration Guide - Page 259
Configuration Synchronization
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Chapter 7 Configuring Redundant ACE Appliances Overview of Redundancy For multiple contexts, the FT VLAN resides in the system configuration file. Each FT VLAN on the ACE has one unique MAC address associated with it. The ACE uses these device MAC addresses as the source or destination MACs for sending or receiving redundancy protocol state and configuration replication packets. Note The IP address and the MAC address of the FT VLAN do not change at switchover. Configuration Synchronization For redundancy to function properly, both members of an FT group must have identical configurations. Ensure that both ACE appliances include the same bandwidth software license (2G or 1G) and the same virtual context software license. If there is a mismatch in software license between the two ACE appliances in an FT group, the following operational behavior can occur: • If there is a mismatch in virtual context software license, synchronization between the active ACE and standby ACE may not work properly. • If both the active and the standby ACE appliances have the same virtual content software license but have a different bandwidth software license, synchronization will work properly but the standby ACE may experience a potential loss of traffic on switchover from the 2G ACE appliance to the 1G ACE appliance. See the Cisco 4700 Series Application Control Engine Appliance Administration Guide for details about the available ACE software licenses. The ACE automatically replicates the active configuration on the standby member using a process called configuration synchronization (config sync). Config sync automatically replicates any changes made to the configuration of the active member to the standby member. After the ACE synchronizes the redundancy configuration from the active member to the standby peer, it disables configuration mode on the standby. For information about configuring config sync, see the "Synchronizing Redundant Configurations" section. OL-11157-01 Cisco 4700 Series Application Control Engine Appliance Administration Guide 7-7
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