Figure Network Load Balancing cluster with the multiple adapters in unicast mode

Configuration with multiple network adapters in a multicast mode (shown in Figure 25-8) allows the use of a single switch for cluster and management network connections (as well as other nonclustered systems). Switch flooding can be avoided by enabling IGMP support on the cluster and IGMP monitoring on the switch or by creating a dedicated VLAN for the cluster nodes.

Each cluster node can have only a single adapter that is bound to a particular NLB cluster. However, if a server has multiple adapters, then each of them can be associated with a different cluster.

In addition to deciding what configuration best suits your needs and budget, you must determine your optimum port rule settings. To obtain the best mix of load balancing and high availability, set the load weight to reflect the processing capacity of cluster nodes, and set the filtering to multiple host.

Switch for Cluster Outbound and Management Traffic

Switch for Cluster Outbound and Management Traffic

Figure 25-8: Network Load Balancing cluster with the multiple adapters in multicast mode

The affinity value depends on whether communication will be session oriented and if so, whether the session information is maintained on cluster nodes or outside of them. The most even distribution is accomplished by using None. None affinity is commonly used when directing client traffic to static Web pages residing on a Web farm. Reasons for using class C and single affinities ware explained earlier.

If your goal is high availability but your application doesn't support load balancing, set the filtering mode to single host; the preferred node should have its host priority set to the lowest numerical value.

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