Router Configuration Guide 701
Cflowd
In This Chapter
This chapter provides information to configure Cflowd.
Topics in this chapter include:
• Cflowd Overview
→ Operation
→ Cflowd Filter Matching
• Cflowd Configuration Process Overview
• Configuration Notes
Cflowd Overview
Cflowd is a tool used to sample IPv4, IPv6, MPLS, and Ethernet traffic data flows through a
router. Cflowd enables traffic sampling and analysis by ISPs and network engineers to
support capacity planning, trends analysis, and characterization of workloads in a network
service provider environment.
Cflowd is also useful for traffic engineering, network planning and analysis, network
monitoring, developing user profiles, data warehousing and mining, as well as security-
related investigations. Collected information can be viewed several ways such as in port, AS,
or network matrices, and pure flow structures. The amount of data stored depends on the
cflowd configurations.
Cflowd maintains a list of data flows through a router. A flow is a unidirectional traffic stream
defined by several characteristics such as source and destination IP addresses, source and
destination ports, inbound interface, IP protocol and TOS bits.
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