Introduction to policies and expressions

For many NetScaler features, policies control how a feature evaluates data. A policy uses a logical expression, called as rule, to evaluate data, and applies one or more actions based on evaluation. Alternatively, a policy can apply a profile, which defines a complex action.

Some NetScaler features use Advanced policies, which provide greater capabilities than older classic policies. If you have migrated to a newer release of the NetScaler software and have configured classic policies for features that use Advanced policies, you have to manually migrate policies to advanced policy infrastructure.