Cisco ACE-4710-K9 Administration Manual page 255

Chapter 7 Configuring Redundant ACE Appliances
Each FT group acts as an independent redundancy instance. When a switchover
occurs, the active member in the FT group becomes the standby member and the
original standby member becomes the active member. A switchover can occur for
the following reasons:
•
•
•
Figure 7-1
of ACEs configured for redundancy. The letters (A, B, C, and D) represent the
active contexts in each redundancy group, while the primed letters (A', B', C', and
D') are the standby contexts. The contexts are evenly distributed between the two
ACEs. You always configure the active and the standby contexts on different
ACEs.
Figure 7-1
N=2
# redundant groups
=2
N=2
# redundant groups
=4
OL-11157-01
The active member becomes unresponsive.
A tracked host or interface fails (see the
Detection" section).
You enter the ft switchover command to force a switchover (see the
a Failover" section).
shows two possible redundancy configurations, where N is the number
Even Distribution of Contexts
A
C
Cisco 4700 Series Application Control Engine Appliance Administration Guide
"Configuring Tracking and Failure
A
B'
B A'
B C'
D A'
Overview of Redundancy
"Forcing
D'
B'
7-3