22 Citrix NetScaler Policy Configuration and Reference Guide
• A policy evaluates to TRUE and its Goto statement value is END.
No further policies or policy banks in this feature are evaluated.
• An external policy bank is invoked, its evaluation returns an END, and the
Goto statement uses a value of USE_INVOCATION_RESULT or END.
Evaluation continues with the next policy bank for this feature. For
example, if the current bank is the request-time override bank, the
NetScaler next evaluates request-time policy banks for the virtual servers.
• The NetScaler has walked through all the policy banks in this feature, but
has not encountered an END.
If this is the last entry to be evaluated in this policy bank, the NetScaler
proceeds to the next feature.
How Features Use Actions After Policy Evaluation
After evaluating all relevant policies for a particular data point (for example, an
HTTP request), the NetScaler stores all the actions that are associated with any
policy that matched the data.
For most features, all the actions from matching policies are applied to a traffic
packet as it leaves the NetScaler. The Integrated Caching feature only applies one
action: CACHE or NOCACHE. This action is associated with the policy with the
lowest priority value in the “highest priority” policy bank (for example,
request-time override policies are applied before virtual server-specific policies).
Binding a Policy Globally
The following binding procedures are typical. However, refer to the
documentation for the feature of interest to you for complete instructions.
To bind an Integrated Caching advanced policy globally by using the
NetScaler command line
At the NetScaler command prompt, type:
bind cache global <policyName> -priority <positiveInteger> [-type
REQ_OVERRIDE | REQ_DEFAULT | RES_OVERRIDE | RES_DEFAULT]
Example
bind cache global myCachePolicy -priority 100 -type req_default
The type argument is optional to maintain backward compatibility. If you omit
the type, the policy is bound to REQ_DEFAULT or RES_DEF AULT, depending
on whether the policy rule is a response-time or a request-time expression.