Citrix Systems 9.2 Binding Advanced Policies, Feature-Specific Differences in Policy Bindings

16 Citrix NetScaler Policy Configuration and Reference Guide

Note: At the command line, quote marks within a policy rule (the expression) must be escaped or delimited with the q delimiter. For more information, see “Configuring Advanced Expressions in a Policy,” on page 57.

Binding Advanced Policies

After defining a policy, you indicate when the policy is to be invoked by binding the policy to a bind point and specifying a priority level. You can bind a policy to only one bind point. A bind point can be global, that is, it can apply to all virtual servers that you have configured. Or, a bind point can be specific to a particular virtual server, which can be either a load balancing or a content switching virtual server. Not all bind points are available for all features.

The order in which policies are evaluated determines the order in which they are applied, and features typically evaluate the various policy banks in a particular order. Sometimes, however, other features can affect the order of evaluation. Within a policy bank, the order of evaluation depends on the values of parameters configured in the policies. Most features apply all of the actions associated with policies whose evaluation results in a match with the data that is being processed. The integrated caching feature is an exception.

Feature-Specific Differences in Policy Bindings

You can bind policies to built-in, global bind points (or banks), to virtual servers, or to policy labels.

However, the NetScaler features differ in terms of the types of bindings that are available. The following table summarizes how you use policy bindings in various NetScaler features that use advanced policies.

Feature-Specific Bindings for Advanced Policies

Feature Name	Virtual Servers	Policies	Bind Points	Use of Advanced Policies in
	Configured in the	Configured in the	Configured for the	the Feature
	Feature	Feature	Policies
DNS	none	DNS policies	Global	To determine how to
				perform DNS resolution for
				requests.