My experience with NLB (previously wlb) is that it is highly dependent on the switches to which the cluster uplinks as well. What makes this especially difficult, is that the terms for every switch vendor and indeed the NLB documentation use similar, but not identical terms to describe the needed features to make NLB function. In our case, the switches are not really documented in the same terminology, so it makes it very difficult to figure out what is needed. So while the PA is relevant, it really is only one part of a much more complicated system.
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