Configuring Cisco IOS Flexible NetFlow with Predefined Records

Last Updated: November 7, 2011

This module contains information about and instructions for configuring Flexible NetFlow using predefined records. Many of the Flexible NetFlow predefined records use the same key and nonkey fields as the aggregation caches available in original NetFlow. However, the predefined Flexible NetFlow records do not perform aggregation.

NetFlow is a Cisco IOS technology that provides statistics on packets flowing through a router. NetFlow is the standard for acquiring IP operational data from IP networks. NetFlow provides data to support network and security monitoring, network planning, traffic analysis, and IP accounting.

Flexible NetFlow improves on original NetFlow by adding the capability to customize the traffic analysis parameters for your specific requirements. Flexible NetFlow facilitates the creation of more complex configurations for traffic analysis and data export through the use of reusable configuration components.

Finding Feature Information

Your software release may not support all the features documented in this module. For the latest feature information and caveats, see the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the Feature Information Table at the end of this document.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.

Prerequisites for Flexible NetFlow with Predefined Records

  • You are familiar with the information in the " Cisco IOS Flexible NetFlow Overview " module.
  • The networking device must be running a Cisco IOS release that supports Flexible NetFlow.

IPv4 Traffic

  • The networking device must be configured for IPv4 routing.
  • One of the following must be enabled on your router and on any interfaces on which you want to enable Flexible NetFlow: Cisco Express Forwarding or distributed Cisco Express Forwarding.

IPv6 Traffic

  • The networking device must be configured for IPv6 routing.
  • One of the following must be enabled on your router and on any interfaces on which you want to enable Flexible NetFlow: Cisco Express Forwarding IPv6 or distributed Cisco Express Forwarding IPv6.

Restrictions for Flexible NetFlow with Predefined Records

Cisco IOS Release 12.2(50)SY

  • Predefined records specifying mask and prefix are not supported.

Information About Configuring Flexible NetFlow with Predefined Records

Flexible NetFlow Predefined Records

Flexible NetFlow predefined records are based on the original NetFlow ingress and egress caches and the aggregation caches. The difference between the original NetFlow aggregation caches and the corresponding predefined Flexible NetFlow records is that the predefined records do not perform aggregation. Flexible NetFlow predefined records are associated with a Flexible NetFlow flow monitor the same way that you associate a user-defined (custom) record.

Benefits of Flexible NetFlow Predefined Records

If you have been using original NetFlow or original NetFlow with aggregation caches you can continue to capture the same traffic data for analysis when you migrate to Flexible NetFlow by using the predefined records available with Flexible NetFlow. Many users will find that the preexisting Flexible NetFlow records are suitable for the majority of their traffic analysis requirements.

NetFlow Original and NetFlow IPv4 Original Input Predefined Records

The Flexible NetFlow "NetFlow original" and "NetFlow IPv4 original input" predefined records can be used interchangeably because they have the same key and nonkey fields. The key and nonkey fields and the counters for the Flexible NetFlow "NetFlow original" and "NetFlow IPv4 original input" predefined records are shown in the table below.

Table 1 Key and Nonkey Fields Used by the Flexible NetFlow NetFlow Original and NetFlow IPv4 Original Input Predefined Records

Field

Key or Nonkey Field

Definition

IP ToS

Key

Value in the type of service (ToS) field.

IP Protocol

Key

Value in the IP protocol field.

IP Source Address

Key

IP source address.

IP Destination Address

Key

IP destination address.

Transport Source Port

Key

Value of the transport layer source port field.

Transport Destination Port

Key

Value of the transport layer destination port field.

Interface Input

Key

Interface on which the traffic is received.

Flow Sampler ID

Key

ID number of the flow sampler (if flow sampling is enabled).

IP Source AS

Nonkey

Source autonomous system number.

IP Destination AS

Nonkey

Destination autonomous system number.

IP Next Hop Address

Nonkey

IP address of the next hop.

IP Source Mask

Nonkey

Mask for the IP source address.

IP Destination Mask

Nonkey

Mask for the IP destination address.

TCP Flags

Nonkey

Value in the TCP flag field.

Interface Output

Nonkey

Interface on which the traffic is transmitted.

Counter Bytes

Nonkey

Number of bytes seen in the flow.

Counter Packets

Nonkey

Number of packets seen in the flow.

Time Stamp System Uptime First

Nonkey

System uptime (time, in milliseconds, since this device was first booted) when the first packet was switched.

Time Stamp System Uptime Last

Nonkey

System uptime (time, in milliseconds, since this device was first booted) when the last packet was switched.

The configuration in the How to Get Started with Configuring Flexible NetFlow uses the predefined Flexible NetFlow "NetFlow original" record.

NetFlow IPv4 Original Output Predefined Record

The Flexible NetFlow "NetFlow IPv4 original output" predefined record is used to emulate the original NetFlow Egress NetFlow Accounting feature that was released in Cisco IOS Release 12.3(11)T. The key and nonkey fields and the counters for the Flexible NetFlow "NetFlow IPv4 original output" predefined record are shown in the table below.

Table 2 Key and Nonkey Fields Used by the Flexible NetFlow NetFlow IPv4 Original Output Predefined Record

Field

Key or Nonkey Field

Definition

IP ToS

Key

Value in the ToS field.

IP Protocol

Key

Value in the IP protocol field.

IP Source Address

Key

IP source address.

IP Destination Address

Key

IP destination address.

Transport Source Port

Key

Value of the transport layer source port field.

Transport Destination Port

Key

Value of the transport layer destination port field.

Interface Output

Key

Interface on which the traffic is transmitted.

Flow Sampler ID

Key

ID number of the flow sampler (if flow sampling is enabled).

IP Source AS

Nonkey

Source autonomous system number.

IP Destination AS

Nonkey

Destination autonomous system number.

IP Next Hop Address

Nonkey

IP address of the next hop.

IP Source Mask

Nonkey

Mask for the IP source address.

IP Destination Mask

Nonkey

Mask for the IP destination address.

TCP Flags

Nonkey

Value in the TCP flag field.

Interface Input

Nonkey

Interface on which the traffic is received.

Counter Bytes

Nonkey

Number of bytes seen in the flow.

Counter Packets

Nonkey

Number of packets seen in the flow.

Time Stamp System Uptime First

Nonkey

System uptime (time, in milliseconds, since this device was first booted) when the first packet was switched.

Time Stamp System Uptime Last

Nonkey

System uptime (time, in milliseconds, since this device was first booted) when the last packet was switched.

The configuration in the Example Configuring Flexible NetFlow Egress Accounting for IPv4 and IPv6 Traffic uses the predefined Flexible NetFlow "NetFlow original output" record.

NetFlow IPv6 Original Input Predefined Record

The key and nonkey fields and the counters for the Flexible NetFlow "NetFlow IPv6 original input" predefined record are shown in the table below.

Table 3 Key and Nonkey Fields Used by the Flexible NetFlow NetFlow IPv6 Original Input Predefined Record

Field

Key or NonKey Field

Definition

Traffic Class

Key

Value in the traffic class field.

Flow Label

Key

Flow label.

Protocol

Key

Value in the protocol field.

Extension Map

Key

Value in the extension map bitmap.

IP Source Address

Key

IP source address.

IP Destination Address

Key

IP destination address.

Transport Source Port

Key

Value of the transport layer source port field.

Transport Destination Port

Key

Value of the transport layer destination port field.

Interface Input

Key

Interface on which the traffic is received.

Flow Direction

Key

The direction of the flow.

Flow Sampler

Key

ID number of the flow sampler (if flow sampling is enabled).

Routing Source AS

Nonkey

Source autonomous system number.

Routing Destination AS

Nonkey

Destination autonomous system number.

Routing Next-hop Address

Nonkey

IP address of the next hop.

IP Source Mask

Nonkey

Mask for the IP source address.

IP Destination Mask

Nonkey

Mask for the IP destination address.

Transport TCP Flags

Nonkey

Value in the TCP flag field.

Interface Output

Nonkey

Interface over which the traffic is transmitted.

Counter Bytes

Nonkey

Number of bytes seen in the flow.

Counter Packets

Nonkey

Number of packets seen in the flow.

Time Stamp System Uptime First

Nonkey

System uptime (time, in milliseconds, since this device was first booted) when the first packet was switched.

Time Stamp System Uptime Last

Nonkey

System uptime (time, in milliseconds, since this device was first booted) when the last packet was switched.

NetFlow IPv6 Original Input Predefined Record

The key and nonkey fields and the counters for the Flexible NetFlow "NetFlow IPv6 original input" predefined record are shown in the table below.

Table 4 Key and Nonkey Fields Used by the Flexible NetFlow NetFlow IPv6 Original Input Predefined Record

Field

Key or NonKey Field

Definition

Traffic Class

Key

Value in the traffic class field.

Flow Label

Key

Flow label.

Protocol

Key

Value in the protocol field.

Extension Map

Key

Value in the extension map bitmap.

IP Source Address

Key

IP source address.

IP Destination Address

Key

IP destination address.

Transport Source Port

Key

Value of the transport layer source port field.

Transport Destination Port

Key

Value of the transport layer destination port field.

Interface Input

Key

Interface on which the traffic is received.

Flow Direction

Key

The direction of the flow.

Flow Sampler

Key

ID number of the flow sampler (if flow sampling is enabled).

Routing Source AS

Nonkey

Source autonomous system number.

Routing Destination AS

Nonkey

Destination autonomous system number.

Routing Next-hop Address

Nonkey

IP address of the next hop.

IP Source Mask

Nonkey

Mask for the IP source address.

IP Destination Mask

Nonkey

Mask for the IP destination address.

Transport TCP Flags

Nonkey

Value in the TCP flag field.

Interface Output

Nonkey

Interface over which the traffic is transmitted.

Counter Bytes

Nonkey

Number of bytes seen in the flow.

Counter Packets

Nonkey

Number of packets seen in the flow.

Time Stamp System Uptime First

Nonkey

System uptime (time, in milliseconds, since this device was first booted) when the first packet was switched.

Time Stamp System Uptime Last

Nonkey

System uptime (time, in milliseconds, since this device was first booted) when the last packet was switched.

Autonomous System Predefined Record

The Flexible NetFlow "autonomous system" predefined record creates flows based on autonomous system-to-autonomous system traffic flow data. The Flexible NetFlow "autonomous system" predefined record uses the same key and nonkey fields as the original NetFlow "autonomous system" aggregation cache.


Note
This predefined record can be used to analyze IPv4 and IPv6 traffic.

The table below lists the key and nonkey fields used in the Flexible NetFlow "autonomous system" predefined record.

Table 5 Key and Nonkey Fields Used by the Flexible NetFlow Autonomous System Predefined Record

Field

Key or Nonkey Field

Definition

IP Source AS

Key

Autonomous system of the source IP address (peer or origin).

IP Destination AS

Key

Autonomous system of the destination IP address (peer or origin).

Interface Input

Key

Interface on which the traffic is received.

Interface Output

Key

Interface on which the traffic is transmitted.

Flow Direction

Key

Direction in which the flow is being monitored.

Counter Bytes

Nonkey

Number of bytes seen in the flow.

Counter Packets

Nonkey

Number of packets seen in the flow.

Time Stamp System Uptime First

Nonkey

System uptime (time, in milliseconds since this device was first booted) when the first packet was switched.

Time Stamp System Uptime Last

Nonkey

System uptime (time, in milliseconds since this device was first booted) when the last packet was switched.

Autonomous System ToS Predefined Record

The Flexible NetFlow "autonomous system ToS" predefined record creates flows based on autonomous system-to-autonomous system and type of service (ToS) traffic flow data. The Flexible NetFlow "autonomous system ToS" predefined record uses the same key and nonkey fields as the original NetFlow "autonomous system ToS" aggregation cache.


Note
This predefined record can be used to analyze only IPv4 traffic.

Tip

This predefined record is particularly useful for generating autonomous system-to-autonomous system traffic flow data.

The table below lists the key and nonkey fields used in the Flexible NetFlow "autonomous system ToS" predefined record.

Table 6 Key and Nonkey Fields Used by the Flexible NetFlow Autonomous System ToS Predefined Record

Field

Key or Nonkey Field

Definition

IP ToS

Key

Value in the ToS field.

IP Source autonomous system

Key

Autonomous system of the source IP address (peer or origin).

IP Destination autonomous system

Key

Autonomous system of the destination IP address (peer or origin).

Interface Input

Key

Interface on which the traffic is received.

Interface Output

Key

Interface on which the traffic is transmitted.

Flow Direction

Key

Direction in which the flow is being monitored.

Counter Bytes

Nonkey

Number of bytes seen in the flow.

Counter Packets

Nonkey

Number of packets seen in the flow.

Time Stamp System Uptime First

Nonkey

System uptime (time, in milliseconds, since this device was first booted) when the first packet was switched.

Time Stamp System Uptime Last

Nonkey

System uptime (time, in milliseconds, since this device was first booted) when the last packet was switched.

BGP Next-Hop Predefined Record

The Flexible NetFlow "BGP next-hop" predefined record creates flows based on Border Gateway Protocol (BGP) traffic flow data.


Note
This predefined record can be used to analyze only IPv6 traffic.

The table below lists the key and nonkey fields used in the Flexible NetFlow "BGP next-hop" predefined record.

Table 7 Key and Nonkey Fields Used by the Flexible NetFlow BGP Next-Hop Predefined Record

Field

Key or Nonkey Field

Definition

Routing Source AS

Key

Autonomous system of the source IP address.

Routing Destination AS

Key

Autonomous system of the destination IP address.

Routing Next-hop Address IPv6 BGP

Key

IPv6 address of the BGP next hop.

Interface Input

Key

Interface on which the traffic is received.

Interface Output

Key

Interface on which the traffic is transmitted.

Flow Direction

Key

Direction in which the flow is being monitored.

Counter Bytes

Nonkey

Number of bytes seen in the flow.

Counter Packets

Nonkey

Number of packets seen in the flow.

Timestamp Sys-uptime First

Nonkey

System uptime (time, in milliseconds, since this device was first booted) when the first packet was switched.

Timestamp Sys-uptime Last

Nonkey

System uptime (time, in milliseconds, since this device was first booted) when the last packet was switched.

BGP Next-Hop ToS Predefined Record

The Flexible NetFlow "BGP next-hop ToS" predefined record creates flows based on BGP and ToS traffic flow data. The Flexible NetFlow "BGP next-hop ToS" predefined record uses the same key and nonkey fields as the original NetFlow "BGP next-hop ToS" aggregation cache.


Note
This predefined record can be used to analyze only IPv4 traffic.

The table below lists the key and nonkey fields used in the "BGP next-hop ToS" predefined record.

Table 8 Key and Nonkey Fields Used by the Flexible NetFlow BGP Next-Hop ToS Predefined Record

Field

Key or Nonkey Field

Definition

IP ToS

Key

Value in the ToS field.

IP Source autonomous system

Key

Autonomous system of the source IP address (peer or origin).

IP Destination autonomous system

Key

Autonomous system of the destination IP address (peer or origin).

IPv4 Next Hop Address BGP

Key

IPv4 address of the BGP next hop.

Interface Input

Key

Interface on which the traffic is received.

Interface Output

Key

Interface on which the traffic is transmitted.

Flow Direction

Key

Direction in which the flow is being monitored.

Counter Bytes

Nonkey

Number of bytes seen in the flow.

Counter Packets

Nonkey

Number of packets seen in the flow.

Time Stamp System Uptime First

Nonkey

System uptime (time, in milliseconds, since this device was first booted) when the first packet was switched.

Time Stamp System Uptime Last

Nonkey

System uptime (time, in milliseconds, since this device was first booted) when the last packet was switched.

Destination Prefix Predefined Record

The Flexible NetFlow "destination prefix" predefined record creates flows based on destination prefix traffic flow data. The Flexible NetFlow "destination prefix" predefined record uses the same key and nonkey fields as the original NetFlow "destination prefix" aggregation cache.


Note
This predefined record can be used to analyze IPv4 and IPv6 traffic.

The table below lists the key and nonkey fields used in the Flexible NetFlow "destination prefix" predefined record.

Table 9 Key and Nonkey Fields Used by the Flexible NetFlow Destination Prefix Predefined Record

Field

Key or Nonkey Field

Definition

IP Destination autonomous system

Key

Autonomous system of the destination IP address (peer or origin).

IPv4 or IPv6 Destination Prefix

Key

Destination IP address ANDed with the destination prefix mask.

IPv4 or IPv6 Destination Mask

Key

Number of bits in the destination prefix.

Interface Output

Key

Interface on which the traffic is transmitted.

Flow Direction

Key

Direction in which the flow is being monitored.

Counter Bytes

Nonkey

Number of bytes seen in the flow.

Counter Packets

Nonkey

Number of packets seen in the flow.

Time Stamp System Uptime First

Nonkey

System uptime (time, in milliseconds, since this device was first booted) when the first packet was switched.

Time Stamp System Uptime Last

Nonkey

System uptime (time, in milliseconds, since this device was first booted) when the last packet was switched.

Destination Prefix ToS Predefined Record

The Flexible NetFlow "destination prefix ToS" predefined record creates flows based on destination prefix and ToS traffic flow data. The Flexible NetFlow "destination prefix ToS" predefined record uses the same key and nonkey fields as the original NetFlow "destination prefix ToS" aggregation cache.

This predefined record is particularly useful for capturing data with which you can examine the destinations of network traffic passing through a NetFlow-enabled device.


Note
This predefined record can be used to analyze only IPv4 traffic.

The table below lists the key and nonkey fields used in the Flexible NetFlow "destination prefix ToS" predefined record.

Table 10 Key and Nonkey Fields Used by the Flexible NetFlow Destination Prefix ToS Predefined Record

Field

Key or Nonkey Field

Definition

IP ToS

Key

Value in the ToS field.

IP Destination autonomous system

Key

Autonomous system of the destination IP address (peer or origin).

IPv4 Destination Prefix

Key

Destination IP address ANDed with the destination prefix mask.

IPv4 Destination Mask

Key

Number of bits in the destination prefix.

Interface Output

Key

Interface on which the traffic is transmitted.

Flow Direction

Key

Direction in which the flow is being monitored.

Counter Bytes

Nonkey

Number of bytes seen in the flow.

Counter Packets

Nonkey

Number of packets seen in the flow.

Time Stamp System Uptime First

Nonkey

System uptime (time, in milliseconds, since this device was first booted) when the first packet was switched.

Time Stamp System Uptime Last

Nonkey

System uptime (time, in milliseconds, since this device was first booted) when the last packet was switched.

Prefix Predefined Record

The Flexible NetFlow "prefix" predefined record creates flows based on the source and destination prefixes in the traffic flow data. The Flexible NetFlow "prefix" predefined record uses the same key and nonkey fields as the original NetFlow "prefix" aggregation cache.


Note
This predefined record can be used to analyze IPv4 and IPv6 traffic. For IPv6 traffic, a minimum prefix mask length of 0 bits is assumed.

The table below lists the key and nonkey fields used in the Flexible NetFlow "prefix" predefined record.

Table 11 Key and Nonkey Fields Used by the Flexible NetFlow Prefix Predefined Record

Field

Key or Nonkey Field

Definition

IP Source autonomous system

Key

Autonomous system of the source IP address (peer or origin).

IP Destination autonomous system

Key

Autonomous system of the destination IP address (peer or origin).

IPv4 or IPv6 Source Prefix

Key

Source IP address ANDed with the source prefix mask, or the prefix to which the source IP address of the aggregated flows belongs.

IPv4 or IPv6 Source Mask

Key

Number of bits in the source prefix.

IPv4 or IPv6 Destination Prefix

Key

Destination IP address ANDed with the destination prefix mask.

IPv4 or IPv6 Destination Mask

Key

Number of bits in the destination prefix.

Interface Input

Key

Interface on which the traffic is received.

Interface Output

Key

Interface on which the traffic is transmitted.

Counter Bytes

Nonkey

Number of bytes seen in the flow.

Counter Packets

Nonkey

Number of packets seen in the flow.

Time Stamp System Uptime First

Nonkey

System uptime (time, in milliseconds, since this device was first booted) when the first packet was switched.

Time Stamp System Uptime Last

Nonkey

System uptime (time, in milliseconds, since this device was first booted) when the last packet was switched.

Prefix Port Predefined Record

The Flexible NetFlow "prefix port" predefined record creates flows based on source and destination prefixes and ports in the traffic flow data. The Flexible NetFlow "prefix port" predefined record uses the same key and nonkey fields as the original NetFlow "prefix port" aggregation cache.

This predefined record is particularly useful for capturing data with which you can examine the sources and destinations of network traffic passing through a NetFlow-enabled device.


Note
This predefined record can be used to analyze only IPv4 traffic.

The table below lists the key and nonkey fields used in the destination Flexible NetFlow "prefix port" predefined record.

Table 12 Key and Nonkey Fields Used by the Flexible NetFlow Prefix Port Predefined Record

Field

Key or Nonkey Field

Definition

IP ToS

Key

Value in the ToS field.

IP Protocol

Key

Value in the IP protocol field.

IPv4 Source Prefix

Key

Source IP address ANDed with the source prefix mask, or the prefix to which the source IP address of the aggregated flows belongs.

IPv4 Source Mask

Key

Number of bits in the source prefix.

IPv4 Destination Prefix

Key

Destination IP address ANDed with the destination prefix mask.

IPv4 Destination Mask

Key

Number of bits in the destination prefix.

Transport Source Port

Key

Value in the transport layer source port field.

Transport Destination Port

Key

Value in the transport layer destination port field.

Interface Input

Key

Interface on which the traffic is received.

Interface Output

Key

Interface on which the traffic is transmitted.

Flow Direction

Key

Direction in which the flow is being monitored.

Counter Bytes

Nonkey

Number of bytes seen in the flow.

Counter Packets

Nonkey

Number of packets seen in the flow.

Time Stamp System Uptime First

Nonkey

System uptime (time, in milliseconds, since this device was first booted) when the first packet was switched.

Time Stamp System Uptime Last

Nonkey

System uptime (time, in milliseconds, since this device was first booted) when the last packet was switched.

Prefix ToS Predefined Record

The Flexible NetFlow "prefix ToS" predefined record creates flows based on source and destination prefixes and ToS traffic flow data. The Flexible NetFlow "prefix ToS" predefined record uses the same key and nonkey fields as the original NetFlow "destination prefix ToS" aggregation cache.

This predefined record is particularly useful for capturing data with which you can examine the sources and destinations of network traffic passing through a NetFlow-enabled device.


Note
This predefined record can be used to analyze only IPv4 traffic.

The table below lists the key and nonkey fields used in the Flexible NetFlow "prefix ToS" predefined record.

Table 13 Key and Nonkey Fields Used by the Flexible NetFlow Prefix ToS Predefined Record

Field

Key or Nonkey Field

Definition

IP ToS

Key

Value in the ToS field.

IP Source autonomous system

Key

Autonomous system of the source IP address (peer or origin).

IP Destination autonomous system

Key

Autonomous system of the destination IP address (peer or origin).

IPv4 Source Prefix

Key

Source IP address ANDed with the source prefix mask, or the prefix to which the source IP address of the aggregated flows belongs.

IPv4 Source Mask

Key

Number of bits in the source prefix.

IPv4 Destination Prefix

Key

Destination IP address ANDed with the destination prefix mask.

IPv4 Destination Mask

Key

Number of bits in the destination prefix.

Interface Input

Key

Interface on which the traffic is received.

Interface Output

Key

Interface on which the traffic is transmitted.

Flow Direction

Key

Direction in which the flow is being monitored.

Counter Bytes

Nonkey

Number of bytes seen in the flow.

Counter Packets

Nonkey

Number of packets seen in the flow.

Time Stamp System Uptime First

Nonkey

System uptime (time, in milliseconds, since this device was first booted) when the first packet was switched.

Time Stamp System Uptime Last

Nonkey

System uptime (time, in milliseconds, since this device was first booted) when the last packet was switched.

Protocol Port Predefined Record

The Flexible NetFlow "protocol port" predefined record creates flows based on protocols and ports in the traffic flow data. The Flexible NetFlow "protocol port" predefined record uses the same key and nonkey fields as the original NetFlow "protocol port" aggregation cache.


Note
This predefined record can be used to analyze IPv4 and IPv6 traffic.

The table below lists the key and nonkey fields used in the Flexible NetFlow "protocol port" predefined record.

Table 14 Key and Nonkey Fields Used by the Flexible NetFlow Protocol Port Predefined Record

Field

Key or Nonkey Field

Definition

IP Protocol

Key

Value in the IP protocol field.

Transport Source Port

Key

Value in the transport layer source port field.

Transport Destination Port

Key

Value in the transport layer destination port field.

Flow Direction

Key

Direction in which the flow is being monitored.

Counter Bytes

Nonkey

Number of bytes seen in the flow.

Counter Packets

Nonkey

Number of packets seen in the flow.

Time Stamp System Uptime First

Nonkey

System uptime (time, in milliseconds, since this device was first booted) when the first packet was switched.

Time Stamp System Uptime Last

Nonkey

System uptime (time, in milliseconds, since this device was first booted) when the last packet was switched.

Protocol Port ToS Predefined Record

The Flexible NetFlow "protocol port ToS" predefined record creates flows based on the protocol, port, and ToS value in the traffic data. The Flexible NetFlow "protocol port ToS" predefined record uses the same key and nonkey fields as the original NetFlow "protocol port ToS" aggregation cache.

This predefined record is particularly useful for capturing data with which you can examine network usage by type of traffic.


Note
This predefined record can be used to analyze only IPv4 traffic.

The table below lists the key and nonkey fields used in the Flexible NetFlow "protocol port ToS" predefined record.

Table 15 Key and Nonkey Fields Used by the Flexible NetFlow Protocol Port ToS Predefined Record

Field

Key or Nonkey Field

Definition

IP ToS

Key

Value in the ToS field.

IP Protocol

Key

Value in the IP protocol field.

Transport Source Port

Key

Value in the transport layer source port field.

Transport Destination Port

Key

Value in the transport layer destination port field.

Flow Direction

Key

Direction in which the flow is being monitored.

Counter Bytes

Nonkey

Number of bytes seen in the flow.

Counter Packets

Nonkey

Number of packets seen in the flow.

Time Stamp System Uptime First

Nonkey

System uptime (time, in milliseconds, since this device was first booted) when the first packet was switched.

Time Stamp System Uptime Last

Nonkey

System uptime (time, in milliseconds, since this device was first booted) when the last packet was switched.

Source Prefix Predefined Record

The Flexible NetFlow "source prefix" predefined record creates flows based on source prefixes in the network traffic. The Flexible NetFlow "source prefix" predefined record uses the same key and nonkey fields as the original NetFlow "source prefix" aggregation cache.


Note
This predefined record can be used to analyze IPv4 and IPv6 traffic.

The table below lists the key and nonkey fields used in the Flexible NetFlow "source prefix" predefined record.

Table 16 Key and Nonkey Fields Used by the Flexible NetFlow Source Prefix Predefined Record

Field

Key or Nonkey Field

Definition

IP Source autonomous system

Key

Autonomous system of the source IP address (peer or origin).

IPv4 or IPv6 Source Prefix

Key

Source IP address ANDed with the source prefix mask, or the prefix to which the source IP address of the aggregated flows belongs.

IPv4 or IPv6 Source Mask

Key

Number of bits in the source prefix.

Interface Input

Key

Interface on which the traffic is received.

Flow Direction

Key

Direction in which the flow is being monitored.

Counter Bytes

Nonkey

Number of bytes seen in the flow.

Counter Packets

Nonkey

Number of packets seen in the flow.

Time Stamp System Uptime First

Nonkey

System uptime (time, in milliseconds, since this device was first booted) when the first packet was switched.

Time Stamp System Uptime Last

Nonkey

System uptime (time, in milliseconds, since this device was first booted) when the last packet was switched.

Source Prefix ToS Predefined Record

The Flexible NetFlow "source prefix ToS" predefined record creates flows based on source prefixes and ToS values in the network traffic. The Flexible NetFlow "source prefix ToS" predefined record uses the same key and nonkey fields as the original NetFlow "source prefix ToS" aggregation cache.

This predefined record is particularly useful for capturing data with which you can examine the sources of network traffic passing through a NetFlow-enabled device.


Note
This predefined record can be used to analyze only IPv4 traffic.

The table below lists the key and nonkey fields used in the Flexible NetFlow "source prefix ToS" predefined record.

Table 17 Key and Nonkey Fields Used by the Flexible NetFlow Source Prefix ToS Predefined Record

Field

Key or Nonkey Field

Definition

IP ToS

Key

Value in the ToS field.

IP Source autonomous system

Key

Autonomous system of the source IP address (peer or origin).

IPv4 Source Prefix

Key

Source IP address ANDed with the source prefix mask, or the prefix to which the source IP address of the aggregated flows belongs.

IPv4 Source Mask

Key

Number of bits in the source prefix.

Interface Input

Key

Interface on which the traffic is received.

Flow Direction

Key

Direction in which the flow is being monitored.

Counter Bytes

Nonkey

Number of bytes seen in the flow.

Counter Packets

Nonkey

Number of packets seen in the flow.

Time Stamp System Uptime First

Nonkey

System uptime (time, in milliseconds, since this device was first booted) when the first packet was switched.

Time Stamp System Uptime Last

Nonkey

System uptime (time, in milliseconds, since this device was first booted) when the last packet was switched.

How to Configure a Predefined Record for the Flow Monitor


Note
Only the keywords and arguments required for the Flexible NetFlow commands used in these tasks are explained in these tasks. For information on the other keywords and arguments available for these Flexible NetFlow commands, refer to the Cisco IOS Flexible NetFlow Command Reference.

Configuring a Flow Monitor for IPv4 Traffic Using a Predefined Record

To configure a flow monitor for IPv4 traffic using a predefined record for the flow monitor, perform the following required task.

Each flow monitor has a separate cache assigned to it. Each flow monitor requires a record to define the contents and layout of its cache entries. The record format can be one of the predefined record formats, or an advanced user may create his or her own record format using the collect and matchcommands in Flexible NetFlow flow record configuration mode.


Note

You must remove a flow monitor from all of the interfaces on which you have applied it before you can modify the record format of the flow monitor.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    flow monitor monitor-name

4.    description description

5.    record {netflow-original | netflow ipv4 record [peer]}

6.    end

7.    show flow record record-name

8.    show running-config flow record record-name


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
flow monitor monitor-name


Example:

Router(config)# flow monitor FLOW-MONITOR-1

 

Creates a flow monitor and enters Flexible NetFlow flow monitor configuration mode.

  • This command also allows you to modify an existing flow monitor.
 
Step 4
description description


Example:

Router(config-flow-monitor)# description Used for monitoring IPv4 traffic

 

(Optional) Creates a description for the flow monitor.

 
Step 5
record {netflow-original | netflow ipv4 record [peer]}


Example:

Router(config-flow-monitor)# record netflow ipv4 original-input

 

Specifies the record for the flow monitor.

 
Step 6
end


Example:

Router(config-flow-monitor)# end

 

Exits Flexible NetFlowflow monitor configuration mode and returns to privileged EXEC mode.

 
Step 7
show flow record record-name


Example:

Router# show flow record FLOW_RECORD-1

 

(Optional) Displays the current status of the specified flow record.

 
Step 8
show running-config flow record record-name


Example:

Router# show running-config flow record FLOW_RECORD-1

 

(Optional) Displays the configuration of the specified flow record.

 

Configuring a Flow Monitor for IPv6 Traffic Using a Predefined Record

To configure a flow monitor for IPv6 traffic using a predefined record for the flow monitor, perform the following required task.

Each flow monitor has a separate cache assigned to it. Each flow monitor requires a record to define the contents and layout of its cache entries. The record format can be one of the predefined record formats, or an advanced user may create his or her own record format using the collect and matchcommands in Flexible NetFlow flow record configuration mode.


Note

You must remove a flow monitor from all of the interfaces on which you have applied it before you can modify the record format of the flow monitor.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    flow monitor monitor-name

4.    description description

5.    record netflow ipv6 record [peer]

6.    end

7.    show flow record record-name

8.    show running-config flow record record-name


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
flow monitor monitor-name


Example:

Router(config)# flow monitor FLOW-MONITOR-2

 

Creates a flow monitor and enters Flexible NetFlow flow monitor configuration mode.

  • This command also allows you to modify an existing flow monitor.
 
Step 4
description description


Example:

Router(config-flow-monitor)# description Used for monitoring IPv6 traffic

 

(Optional) Creates a description for the flow monitor.

 
Step 5
record netflow ipv6 record [peer]


Example:

Router(config-flow-monitor)# record netflow ipv6 original-input

 

Specifies the record for the flow monitor.

 
Step 6
end


Example:

Router(config-flow-monitor)# end

 

Exits Flexible NetFlow flow monitor configuration mode and returns to privileged EXEC mode.

 
Step 7
show flow record record-name


Example:

Router# show flow record FLOW_RECORD-1

 

(Optional) Displays the current status of the specified flow record.

 
Step 8
show running-config flow record record-name


Example:

Router# show running-config flow record FLOW_RECORD-1

 

(Optional) Displays the configuration of the specified flow record.

 

Applying an IPv4 Flow Monitor to an Interface

Before it can be activated, an IPv4 flow monitor must be applied to at least one interface. To activate an IPv4 flow monitor by applying the flow monitor to an interface, perform the following required task.


Note

When you specify the "NetFlow original" or the "NetFlow IPv4 original input" predefined record for the flow monitor to emulate original NetFlow, the flow monitor can be used for analyzing only input (ingress) traffic.

When you specify the "NetFlow IPv4 original output" predefined record for the flow monitor to emulate the Egress NetFlow Accounting feature, the flow monitor can be used for analyzing only output (egress) traffic.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    interface type number

4.    ip flow monitor monitor-name {input | output}

5.    end

6.    show flow monitor monitor-name

7.    show flow monitor [[name] monitor-name [cache [format {csv | record | table}]][statistics]]


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
interface type number


Example:

Router(config)# interface ethernet 0/0

 

Specifies an interface and enters interface configuration mode.

 
Step 4
ip flow monitor monitor-name {input | output}


Example:

Router(config-if)# ip flow monitor FLOW-MONITOR-1 input

 

Activates the flow monitor that you created previously by assigning it to the interface to analyze traffic.

  • You can configure input and output traffic analysis concurrently by configuring the ip flow monitor monitor-name input and ip flow monitor monitor-name output commands on the same interface. You can use different flow monitors for input and output traffic analysis.
 
Step 5
end


Example:

Router(config-if)# end

 

Exits interface configuration mode and returns to privileged EXEC mode.

 
Step 6
show flow monitor monitor-name


Example:

Router# show flow monitor FLOW_MONITOR-1

 

(Optional) Displays the current status of the specified flow monitor.

 
Step 7
show flow monitor [[name] monitor-name [cache [format {csv | record | table}]][statistics]]


Example:

Router# show flow monitor FLOW-MONITOR-1

 

(Optional) Displays the status and statistics for a Flexible NetFlow flow monitor.

 

Applying an IPv6 Flow Monitor to an Interface

Before it can be activated, an IPv6 flow monitor must be applied to at least one interface. To activate an IPv4 flow monitor by applying the flow monitor to an interface, perform the following required task.


Note

When you specify the "NetFlow IPv6 original input" predefined record for the flow monitor to emulate original NetFlow, the flow monitor can be used only for analyzing input (ingress) traffic.

When you specify the "NetFlow IPv6 original output" predefined record for the flow monitor to emulate the Egress NetFlow Accounting feature, the flow monitor can be used only for analyzing output (egress) traffic.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    interface type number

4.    ipv6 flow monitor monitor-name {input | output}

5.    end

6.    show flow monitor monitor-name

7.    show running-config flow monitor monitor-name


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
interface type number


Example:

Router(config)# interface ethernet 0/0

 

Specifies an interface and enters interface configuration mode.

 
Step 4
ipv6 flow monitor monitor-name {input | output}


Example:

Router(config-if)# ipv6 flow monitor FLOW-MONITOR-2 input

 

Activates the flow monitor that you created previously by assigning it to the interface to analyze traffic.

  • You can configure input and output traffic analysis concurrently by configuring the ipv6 flow monitor monitor-name input and ipv6 flow monitor monitor-name output commands on the same interface. You can use different flow monitors for input and output traffic analysis.
 
Step 5
end


Example:

Router(config-if)# end

 

Exits interface configuration mode and returns to privileged EXEC mode.

 
Step 6
show flow monitor monitor-name


Example:

Router# show flow monitor FLOW_MONITOR-1

 

(Optional) Displays the current status of the specified flow monitor.

 
Step 7
show running-config flow monitor monitor-name


Example:

Router# show flow monitor FLOW_MONITOR-1

 

(Optional) Displays the configuration of the specified flow monitor.

 

Configuration Examples for Flexible NetFlow with Predefined Records

Example Configuring a Flexible NetFlow Predefined Record for IPv4 Traffic

The following example shows how to configure a flow monitor using the Flexible NetFlow "BGP ToS next-hop" predefined record to monitor IPv4 traffic.

This sample starts in global configuration mode:

!
flow monitor FLOW-MONITOR-1
 record netflow ipv4 bgp-nexthop-tos
 exit
!
ip cef
!
interface Ethernet 0/0
 ip address 172.16.6.2 255.255.255.0
 ip flow monitor FLOW-MONITOR-1 input
!

Example Configuring a Flexible NetFlow Predefined Record for IPv6 Traffic

The following example shows how to configure a flow monitor using the Flexible NetFlow "source prefix" predefined record to monitor IPv6 traffic.

This sample starts in global configuration mode:

!
flow monitor FLOW-MONITOR-2
 record netflow ipv6 source-prefix
 exit
ip cef
ipv6 cef
!
interface Ethernet 0/0
 ipv6 address 2001:DB8:2:ABCD::2/48
 ipv6 flow monitor FLOW-MONITOR-2 input
!

Where to Go Next

For information on advanced Flexible NetFlow configurations for specific purposes such as quality of service (QoS) and bandwidth monitoring, application and user flow monitoring and profiling, and security analysis, refer to the "Customizing Cisco IOS Flexible NetFlow Flow Records and Flow Monitors" module.

If you want to configure flow sampling to reduce the CPU overhead of analyzing traffic, refer to the "Using Cisco IOS Flexible NetFlow Flow Sampling to Reduce the CPU Overhead of Analyzing Traffic" module.

If you want to configure data export for Flexible NetFlow, refer to the "Configuring Data Export for Cisco IOS Flexible NetFlow with Flow Exporters" module.

Additional References

Related Documents

Related Topic

Document Title

Cisco IOS commands

Cisco IOS Master Commands List, All Releases

Overview of Flexible NetFlow

"Cisco IOS Flexible NetFlow Overview"

Emulating original NetFlow with Flexible NetFlow

"Getting Started with Configuring Cisco IOS Flexible NetFlow"

Configuring flow exporters to export Flexible NetFlow data

"Configuring Data Export for Cisco IOS Flexible NetFlow with Flow Exporters"

Customizing Flexible NetFlow

"Customizing Cisco IOS Flexible NetFlow Flow Records and Flow Monitors"

Configuring flow sampling to reduce the overhead of monitoring traffic with Flexible NetFlow

"Using Cisco IOS Flexible NetFlow Flow Sampling to Reduce the CPU Overhead of Analyzing Traffic"

Using Flexible NetFlow Top N Talkers to analyze network traffic

"Using Cisco IOS Flexible NetFlow Top N Talkers to Analyze Network Traffic"

Configuring IPv4 multicast statistics support for Flexible NetFlow

"Configuring IPv4 Multicast Statistics Support for Cisco IOS Flexible NetFlow"

Configuration commands for Flexible NetFlow

Cisco IOS Flexible NetFlow Command Reference

Standards

Standard

Title

None

--

MIBs

MIB

MIBs Link

None

To locate and download MIBs for selected platforms, Cisco software releases, and feature sets, use Cisco MIB Locator found at the following URL:

http://www.cisco.com/go/mibs

RFCs

RFC

Title

RFC 3954

Cisco Systems NetFlow Services Export Version 9

Technical Assistance

Description

Link

The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies. Access to most tools on the Cisco Support and Documentation website requires a Cisco.com user ID and password.

http://www.cisco.com/cisco/web/support/index.html

Feature Information for Flexible NetFlow

The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.

Table 18 Feature Information for Flexible NetFlow

Feature Name

Releases

Feature Information

Flexible NetFlow

12.2(33)SRC

12.2(50)SY

12.4(9)T

15.0(1)SY

Flexible NetFlow is introduced.

Support for this feature was added for Cisco 7200 series routers in Cisco IOS Release 12.2(33)SRC.

The following commands were introduced or modified: cache(Flexible NetFlow), clear flow exporter, clear flow monitor, clear sampler, collect counter, collect flow, collect interface, collect ipv4, collect ipv4 destination, collect ipv4 fragmentation, collect ipv4 section, collect ipv4 source, collect ipv4 total-length, collect ipv4 ttl, collect routing, collect timestamp sys-uptime, collect transport, collect transport icmp ipv4, collect transport tcp, collect transport udp, debug flow exporter, debug flow monitor, debug flow record, debug sampler, description (Flexible NetFlow), destination, dscp (Flexible NetFlow), exporter, flow exporter, flow monitor, flow platform, flow record, ip flow monitor, match flow, match interface (Flexible NetFlow), match ipv4, match ipv4 destination, match ipv4 fragmentation, match ipv4 section, match ipv4 source, match ipv4 total-length, match ipv4 ttl, match routing, match transport, match transport icmp ipv4, match transport tcp, match transport udp, mode (Flexible NetFlow), option (Flexible NetFlow), record, sampler, show flow exporter, show flow interface, show flow monitor, show flow record, show sampler, source (Flexible NetFlow), statistics packet, template data timeout, transport (Flexible NetFlow).

Flexible NetFlow--IPv6 Unicast Flows

12.2(33)SRE

12.2(50)SY

12.4(20)T

15.0(1)SY

Enables Flexible NetFlow to monitor IPv6 traffic.

Support for this feature was added for Cisco 7200 and 7300 Network Processing Engine (NPE) series routers in Cisco IOS Release 12.2(33)SRE.

The following commands were introduced or modified: collect routing, debug flow record, match routing, record, show flow monitor, show flow record, collect ipv6, collect ipv6 destination, collect ipv6 extension map, collect ipv6 fragmentation, collect ipv6 hop-limit, collect ipv6 length, collect ipv6 section, collect ipv6 source, collect transport icmp ipv6, ipv6 flow monitor, match ipv6, match ipv6 destination, match ipv6 extension map, match ipv6 fragmentation, match ipv6 hop-limit, match ipv6 length, match ipv6 section, match ipv6 source, match transport icmp ipv6.

Cisco and the Cisco logo are trademarks or registered trademarks of Cisco and/or its affiliates in the U.S. and other countries. To view a list of Cisco trademarks, go to this URL: www.cisco.com/go/trademarks. Third-party trademarks mentioned are the property of their respective owners. The use of the word partner does not imply a partnership relationship between Cisco and any other company. (1110R)

Any Internet Protocol (IP) addresses and phone numbers used in this document are not intended to be actual addresses and phone numbers. Any examples, command display output, network topology diagrams, and other figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses or phone numbers in illustrative content is unintentional and coincidental.

© 2011 Cisco Systems, Inc. All rights reserved.