Cisco ACE-4710-K9 Administration Guide - Page 255
ft switchover, Configuring Tracking and Failure, Detection, Forcing, a Failover,
View all Cisco ACE-4710-K9 manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 255 highlights
Chapter 7 Configuring Redundant ACE Appliances Overview of Redundancy 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: • The active member becomes unresponsive. • A tracked host or interface fails (see the "Configuring Tracking and Failure Detection" section). • You enter the ft switchover command to force a switchover (see the "Forcing a Failover" section). Figure 7-1 shows two possible redundancy configurations, where N is the number 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 Even Distribution of Contexts N=2 A B' # redundant groups =2 B A' A N=2 # redundant groups =4 C B C' D' D A' B' 153639 OL-11157-01 Cisco 4700 Series Application Control Engine Appliance Administration Guide 7-3