Citrix Systems 9.2 Advanced Policies: Controlling the Rate of Traffic

C HAPTER 10
Advanced Policies: Controlling the
Rate of Traffic
You can limit access to virtual servers or any other user-defined entity and
prevent overloading the network by configuring policies and expressions that
control the rate of traffic. You can also configure the NetScaler to perform any
other supported action based on the traffic rate, including redirecting traffic if the
rate exceeds a particular threshold. To do this, you configure policies that enable
the NetScaler to monitor the traffic rate.
In This Chapter
About Policies that Monitor the Traffic Rate
Expressions for Controlling the Traffic Rate
Configuring Policies That Control the Traffic Rate
Note: This chapter provides a brief overview of limiting the traffic rate. For
more information, see the chapter on controlling data flow based on the traffic
rate in the Citrix NetScaler AppExpert Guide.
About Policies that Monitor the Traffic Rate
You can configure policies that monitor the following types of traffic:
• The number of HTTP requests that the NetScaler intercepts.
• The number of DNS requests that the NetScaler intercepts.
• The bandwidth usage.
Expressions for Controlling the Traffic Rate
The following expression prefix can be used to parse the traffic rate:
sys.check_limit("limit_identifier")