Configuring ILB for High Availability By Using the Half-NAT Topology
This section describes how to set up the ILB connections to achieve HA by using the half-NAT topology. You need to set up two load balancers, one as the primary and the other as the standby. If the primary load balancer fails, the standby load balancer assumes the role of the primary load balancer.
Note - The current implementation of ILB does not synchronize primary and standby load balancers. When the primary load balancer fails and the standby load balancer takes over, the existing connections fail. However, HA without synchronization is still valuable under circumstances when the primary load balancer fails.
The following figure shows the half-NAT topology for configuring the ILB connections to achieve HA.
Figure 7-2 ILB for HA Configuration By Using Half-NAT Topology
