Cflowd
Router Configuration Guide 705
Version 9
The Version 9 format is a more flexible format and allows for different templates or sets of
cflowd data to be sent based on the type of traffic being sampled and the template set
configured.
Version 9 is interoperable with RFC 3954, Cisco Systems NetFlow Services Export Version 9.
Version 10
Version 10 is a new format and protocol that inter-operates with the specifications from the
IETF as the IP Flow Information Export (IPFIX) standard. Like Version 9, the version 10
format uses templates to allow for different data elements regarding a flow that is to be
exported and to handle different type of data flows such as IPv4, IPv6, and MPLS.
Version 10 is interoperable with RFC 5150 and 5102.
Cflowd Filter Matching
In the filter-matching process, normally, every packet is matched against filter (access list)
criteria to determine acceptability. With cflowd, only the first packet of a flow is checked. If
the first packet is forwarded, an entry is added to the cflowd cache. Subsequent packets in the
same flow are then forwarded without needing to be matched against the complete set of
filters. Specific performance varies depending on the number and complexity of the filters.
Cflowd Configuration Process Overview
Figure 32 displays the process to configure Cflowd parameters.
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