Chapter 1 Introduction to Policies and Expressions 11
About Migration from Classic to Advanced Policies and Expressions
The NetScaler supports either classic or advanced policies within a feature. You
cannot have both types in the same feature. Over the past few releases, some
NetScaler features have migrated from using classic policies and expressions to
advanced policies and expressions. If a feature of interest to you have changed to
the advanced format, you may have to manually migrate the older information.
Following are guidelines for deciding if you need to migrate your policies:
• If you configured classic policies in a version of the Integrated Caching
feature prior to release 9.0 and then upgrade to version 9.0 or later, there is
no impact. All legacy policies are migrated to the advanced policy format.
• For other features, you need to manually migrate classic policies and
expressions to the advanced format if the feature has migrated its format.
Before You Proceed
Before configuring expressions and policies, be sure you understand the relevant
NetScaler feature and the structure of your data, as follows:
• Read the documentation on the relevant feature.
• Look at the data stream for the type of data that you want to configure.
You may want to run a trace on the type of traffic or content that you want
to configure. This will give you an idea of the parameters and values, and
operations on these parameters and values, that you need to specify in an
expression.