Mutual high availability

You have to configure two Dispatcher machines, both of which actively perform load balancing and provide backup for each other. In a simple high-availability configuration, only one machine performs load balancing. In mutual high availability, both machines participate in load balancing.

For mutual high availability, client traffic is assigned to each Dispatcher machine on a cluster address basis. As illustrated in Figure 4-6, you have to configure a cluster for each node that is a primary Dispatcher (so you have at least two clusters in your environment). Each cluster can be configured with the NFA (non-forwarding address) of its primary Dispatcher. The primary Dispatcher machine normally performs load balancing for that cluster. In the event of failure, the other machine performs load balancing for both its own cluster and for the failed Dispatcher's cluster.

Figure 4-6 Dispatcher mutual high availability topology

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