Cisco Systems OL-11399-01 Value Builders

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Cisco NetFlow Collector User Guide

OL-11399-01

Chapter2 Using the NetFlow Collector User Interface Configuration

AString key builder obtains a UTF-8 string value from a flow. It has the following attributes.

ASubnet Address key builder obtains an IP address and mask from a flow, applies the mask to the

address, and outputs a network address in the format n.n.n.n/m. It has the following attributes.

Value Builders

A value builder is associated with one or more fields in flow data and produces a non-key value in an

aggregationrecord. A value builder can be referenced by an Aggregation Scheme and corresponds with

one column in a NetFlow Collector output file.

Clicking on the Value Builders folder of the navigation tree displays a table of all existing value

builders, as shown inFigure 2-11. Click on the appropriate link to modify or remove a value builder.

Attribute Description

Output name Column name in output.

Field ID of the field to obtain from a flow.

Regrex filter If specified, the regular expression is applied to

the string in flow data. The first matching

sequence becomes the value of the key. If the

regrexcontains one or more capturing groups, the

first match is returned.

Allow null value Ifnot selected, an error is logged if a flow does not

contain the indicated field

Attribute Description

Output name Column name in output.

Address field ID of the address field to obtain from a flow.

Mask field ID of the mask field to obtain from a flow.

Allow null value Ifnot selected, an error is logged if a flow does not

contain the indicated field