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Cisco NetFlow Collector User Guide
OL-11399-01
Chapter 2 Using the NetFlow Collector User Interface
Configuration
String
A String key builder obtains a UTF-8 string value from a flow. It has the following attributes.
Subnet Address
A Subnet 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
aggregation record. 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 in Figure 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
regrex contains one or more capturing groups, the
first match is returned.
Allow null value If notselected, an error is logged if aflow doesnot
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 If notselected, an error is logged if aflow doesnot
contain the indicated field