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This article describes the TAP Aggregation User-Defined Fields feature. The purpose of the User-Defined Fields feature is to provide custom offset pattern matching to be used in TAP Aggregation Traffic Steering. This allows for deeper packet inspection of up to 128 bytes. User-Defined Fields, or UDFs, are defined as part of an access-list filter and are comprised of an offset, length and pattern match. This describes a single portion of any incoming packet to match the provided value upon. Access-list filters containing a UDF are then applied as usual as part of a TAP Aggregation Traffic Steering policy
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