Chapter 6 Configuring Redundant Aces; Information About Redundancy - Cisco 4700M Administration Manual

Configuring Redundant ACEs
This chapter describes how to configure the Cisco 4700 Series Application Control Engine (ACE)
appliance for redundancy, which provides fault tolerance for the stateful switchover of flows. It contains
the following major sections:
•
•
•
•
•
•
•
•

Information About Redundancy

Redundancy (or fault tolerance) uses a maximum of two ACEs to ensure that your network remains
operational even if one of the appliances becomes unresponsive. Redundancy ensures that your network
services and applications are always available.
Redundancy provides seamless switchover of flows in case an ACE becomes unresponsive or a critical
host or interface fails. Redundancy supports the following network applications that require fault
tolerance:
•
•
•
•
This section contains the following topics:
•
•
•
•
•
OL-20823-01
Information About Redundancy
Guidelines and Limitations
Default Settings
Configuring Redundant ACEs
Displaying or Clearing Redundancy Information
Displaying FT Group Information
Clearing Redundancy Statistics
Configuration Example of Redundancy
Mission-critical enterprise applications
Banking and financial services
E-commerce
Long-lived flows such as FTP and HTTP file transfers
Redundancy Protocol
Stateful Failover
FT VLAN
Configuration Synchronization
Redundancy State for Software Upgrade or Downgrade
Cisco 4700 Series Application Control Engine Appliance Administration Guide
6
C H A P T E R
6-1