OpenNSL API Guide and Reference Manual: Field Processor APIs

The OpenNSL field module provides access to Field Processor features. The field processor can be used to classify packets based on predefined protocol fields from Layer 2 through Layer 7, as well as user-defined protocol fields. Based on these classifications, various actions can be taken, such as:

Discarding the packet
Sending the packet to the CPU
Sending the packet to a mirror port
Sending the packet on a different CoS queue
Changing the ToS, VLAN or other fields

Each Field Processor entry is allocated in a particular group. Each group is capable of matching packets based on a particular set of qualifying attributes referred to as a qset.

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