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Customizing Cisco IOS Flexible NetFlow Flow Records and Flow Monitors

Table Of Contents

Customizing Cisco IOS Flexible NetFlow Flow Records and Flow Monitors

Finding Feature Information

Contents

Prerequisites for Customizing Flexible NetFlow Flow Records and Flow Monitors

Information About Customizing Flexible NetFlow Flow Records and Flow Monitors

Criteria for Identification of Traffic To Be Used in Analysis in Flexible NetFlow

How to Customize Flexible NetFlow Flow Records and Flow Monitors

Configuring a Customized Flow Record

Creating a Customized Flow Monitor

Prerequisites

Restrictions

Applying a Flow Monitor to an Interface

Restrictions

Configuration Examples for Customizing Flexible NetFlow Flow Records and Flow Monitors

Example: Configuring a Permanent Flow Record Cache with a Limited Number of Possible Flows

Example: Configuring a Customized Flow Record Cache for Monitoring IPv6 Traffic

Example: Configuring Flexible NetFlow for Monitoring MAC and VLAN Statistics

Example: Configuring Flexible NetFlow for Ingress VRF Support

Example: Configuring Flexible NetFlow for Network-Based Application Recognition

Example: Configuring Flexible NetFlow for CTS Fields

Where to Go Next

Additional References

Related Documents

Standards

MIBs

RFCs

Technical Assistance

Feature Information for Flexible NetFlow


Customizing Cisco IOS Flexible NetFlow Flow Records and Flow Monitors


First Published: June 19, 2006
Last Updated: July 20, 2011

This document contains information about and instructions for customizing Flexible NetFlow flow records and flow monitors. If the tasks and configuration examples in the "Getting Started with Configuring Cisco IOS Flexible NetFlow" module and the "Configuring Cisco IOS Flexible NetFlow with Predefined Records" module were not suitable for your traffic analysis requirements, you can use the information and instructions in this document to customize Flexible NetFlow to meet your traffic analysis requirements.

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 for Flexible NetFlow" section.

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

Contents

Prerequisites for Customizing Flexible NetFlow Flow Records and Flow Monitors

Information About Customizing Flexible NetFlow Flow Records and Flow Monitors

How to Customize Flexible NetFlow Flow Records and Flow Monitors

Configuration Examples for Customizing Flexible NetFlow Flow Records and Flow Monitors

Where to Go Next

Additional References

Feature Information for Flexible NetFlow

Prerequisites for Customizing Flexible NetFlow Flow Records and Flow Monitors

You are familiar with the information in the "Cisco IOS Flexible NetFlow Overview" module.

You are familiar with the Flexible NetFlow key fields as they are defined in the following commands in the Cisco IOS Flexible NetFlow Command Reference:

match flow

match interface

match {ipv4 | ipv6}

match routing

match transport

You are familiar with the Flexible NetFlow nonkey fields as they are defined in the following commands in the Cisco IOS Flexible NetFlow Command Reference:

collect counter

collect flow

collect interface

collect {ipv4 | ipv6}

collect routing

collect timestamp sys-uptime

collect transport

The networking device must be running a Cisco IOS release that supports Flexible NetFlow. See the "Cisco IOS Flexible NetFlow Features Roadmap" module for a list of Cisco IOS software releases that support 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.

Information About Customizing Flexible NetFlow Flow Records and Flow Monitors

Criteria for Identification of Traffic To Be Used in Analysis in Flexible NetFlow

Criteria for Identification of Traffic To Be Used in Analysis in Flexible NetFlow

If the predefined Flexible NetFlow records are not suitable for your traffic requirements, you can create a user-defined (custom) record using the Flexible NetFlow collect and match commands. Before you can create a customized record, you must decide the criteria that you are going to use for the key and nonkey fields.

If you want to create a customized record for detecting network attacks, you must include the appropriate key and nonkey fields in the record to ensure that the router creates the flows and captures the data that you need to analyze the attack and respond to it. For example, SYN flood attacks are a common denial of service (DoS) attack in which TCP flags are used to flood open TCP requests to a destination host. When a normal TCP connection starts, a destination host receives a SYN (synchronize/start) packet from a source host and sends back a SYN ACK (synchronize acknowledge). The destination host must then hear an ACK (acknowledge) of the SYN ACK before the connection is established. This is referred to as the "TCP three-way handshake." While the destination host waits for the ACK to the SYN ACK, a connection queue of finite size on the destination host keeps track of connections waiting to be completed. This queue typically empties quickly because the ACK is expected to arrive a few milliseconds after the SYN ACK. The TCP SYN attack exploits this design by having an attacking source host generate TCP SYN packets with random source addresses toward a victim host. The victim destination host sends a SYN ACK back to the random source address and adds an entry to the connection queue. Because the SYN ACK is destined for an incorrect or nonexistent host, the last part of the TCP three-way handshake is never completed and the entry remains in the connection queue until a timer expires, typically for about one minute. Rapid generation by the source of TCP SYN packets from random IP addresses can fill the connection queue and cause denial of TCP services (such as e-mail, file transfer, or WWW) to legitimate users.

The information needed for a security monitoring record for this type of DoS attack might include the following key and nonkey fields:

Key fields:

Destination IP address or destination IP subnet

TCP flags

Packet count

Nonkey fields

Destination IP address

Source IP address

Interface input and output


Tip Many users configure a general Flexible NetFlow monitor that triggers a more detailed Flexible NetFlow view of a DoS attack using these key and nonkey fields.


How to Customize Flexible NetFlow Flow Records and Flow Monitors

The tasks in this section explain how to do the following:

Customize a Flexible NetFlow flow record.

Customize a Flexible NetFlow flow monitor.

Enable Flexible NetFlow.


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


To customize Flexible NetFlow flow records and flow monitors, and to enable Flexible NetFlow, perform the following tasks:

Configuring a Customized Flow Record (required)

Creating a Customized Flow Monitor (required)

Applying a Flow Monitor to an Interface (required)

Configuring a Customized Flow Record

Customized flow records are used to analyze traffic data for a specific purpose. A customized flow record must have at least one match criterion for use as the key field and typically has at least one collect criterion for use as a nonkey field.

There are hundreds of possible permutations of customized flow records. This task explains the steps that are used to create one of the possible permutations. Modify the steps in these tasks as appropriate to create a customized flow record for your requirements.

To configure a customized flow record, perform the following task.

SUMMARY STEPS

1. enable

2. configure terminal

3. flow record record-name

4. description descrription

5. match {ipv4 | ipv6} {destination | source} {address | {mask | prefix} [minimum-mask mask]}

6. Repeat Step 5 as required to configure additional key fields for the record.

7. collect {ipv4 | ipv6} source {address | {mask | prefix} [minimum-mask mask]}

8. Repeat Step 7 as required to configure additional nonkey fields for the record

9. end

10. show flow record record-name

11. 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 record record-name

Example:

Router(config)# flow record FLOW-RECORD-1

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

This command also allows you to modify an existing flow record.

Step 4 

description description

Example:

Router(config-flow-record)# description Used for basic traffic analysis

(Optional) Creates a description for the flow record.

Step 5 

match {ipv4 | ipv6} {destination | source} {address | {mask | prefix} [minimum-mask mask]}

Example:

Router(config-flow-record)# match ipv4 destination address

Configures a key field for the flow record.

Note This example configures the IPv4 destination address as a key field for the record. For information about the other key fields available for the match ipv4 command, and the other match commands that are available to configure key fields, refer to the Cisco IOS Flexible NetFlow Command Reference.

Step 6 

Repeat Step 5 as required to configure additional key fields for the record.

Step 7 

collect {ipv4 | ipv6} source {address | {mask | prefix} [minimum-mask mask]}

Example:

Router(config-flow-record)# collect ipv4 source address

Configures one or more of the IPv4 source fields in the flow as a nonkey field for the record.

Note This example configures the IPv4 source address as a nonkey field for the record. For information on the other collect commands that are available to configure nonkey fields, refer to the Cisco IOS Flexible NetFlow Command Reference.

Step 8 

Repeat Step 7 as required to configure additional nonkey fields for the record.

Step 9 

end

Example:

Router(config-flow-record)# end

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

Step 10 

show flow record record-name

Example:

Router# show flow record FLOW_RECORD-1

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

Step 11 

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.

Creating a Customized Flow Monitor

To create a customized 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. These record formats can be one of the predefined formats, or an advanced user can create a customized format using the flow record command. This task uses the record that you created in the "Configuring a Customized Flow Record" section.

Prerequisites

If you want to use a customized record instead of using one of the Flexible NetFlow predefined records, you must create the customized record before you can perform this task. Refer to the "Configuring a Customized Flow Record" section for information about and instructions for creating a customized flow record.

If you want to add a flow exporter to the flow monitor for data export, you must create the exporter before you can complete this task. Refer to the "Configuring Data Export for Cisco IOS Flexible NetFlow with Flow Exporters" module for information about and instructions for creating a flow exporter.

Restrictions

You must use the no ip flow monitor command to remove a flow monitor from all of the interfaces to which you have applied it before you can modify the parameters for the record command on the flow monitor. For information about the ip flow monitor command, refer to the Cisco IOS Flexible NetFlow Command Reference.

SUMMARY STEPS

1. enable

2. configure terminal

3. flow monitor monitor-name

4. description description

5. record {record-name | netflow-original | netflow {ipv4 | ipv6} record [peer]}

6. cache {entries number | timeout {active | inactive | update} seconds | type {immediate | normal | permanent}}

7. Repeat Step 6 as required to finish modifying the cache parameters for this flow monitor.

8. statistics packet protocol

9. statistics packet size

10. exporter exporter-name

11. end

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

13. 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 

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 basic ipv4 traffic analysis

(Optional) Creates a description for the flow monitor.

Step 5 

record {record-name | netflow-original | netflow {ipv4 | ipv6} record [peer]}

Example:

Router(config-flow-monitor)# record FLOW-RECORD-1

Specifies the record for the flow monitor.

Step 6 

cache {entries number | timeout {active |inactive|update} seconds | type {immediate | normal | permanent}}

Example:

Router(config-flow-monitor)# cache entries 1000

(Optional) Modifies the flow monitor cache parameters such as timeout values, number of cache entries, and the cache type.

The values for the keywords associated with the timeout keyword have no effect when the cache type is set to immediate.

Step 7 

Repeat Step 6 as required to finish modifying the cache parameters for this flow monitor.

Step 8 

statistics packet protocol

Example:

Router(config-flow-monitor)# statistics packet protocol

(Optional) Enables the collection of protocol distribution statistics for Flexible NetFlow monitors.

Step 9 

statistics packet size

Example:

Router(config-flow-monitor)# statistics packet size

(Optional) Enables the collection of size distribution statistics for Flexible NetFlow monitors.

Step 10 

exporter exporter-name

Example:

Router(config-flow-monitor)# exporter EXPORTER-1

(Optional) Specifies the name of an exporter that was created previously.

Refer to the "Configuring Data Export for Cisco IOS Flexible NetFlow with Flow Exporters" module for information about and instructions for configuring flow exporters.

Step 11 

end

Example:

Router(config-flow-monitor)# end

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

Step 12 

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

Example:

Router# show flow monitor FLOW-MONITOR-2 cache

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

Step 13 

show running-config flow monitor monitor-name

Example:

Router# show flow monitor FLOW_MONITOR-1

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

Applying a Flow Monitor to an Interface

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

Restrictions

When you specify the "NetFlow original" or the "NetFlow IPv4 original input" or the "NetFlow IPv6 original input" predefined record for the flow monitor to emulate original NetFlow, the Flexible NetFlow flow monitor can be used only for analyzing input (ingress) traffic.

When you specify the "NetFlow IPv4 original output" or the "NetFlow IPv6 original output" predefined record for the flow monitor to emulate the Egress NetFlow Accounting feature, the Flexible NetFlow flow monitor can be used only for analyzing output (egress) traffic.

SUMMARY STEPS

1. enable

2. configure terminal

3. interface type number

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

5. Repeat Steps 3 and 4 to activate a flow monitor on any other interfaces in the router over which you want to monitor traffic.

6. end

7. show flow interface type number

8. show flow monitor name monitor-name cache format record

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

Example:

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

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

Step 5 

Repeat Steps 3 and 4 to activate a flow monitor on any other interfaces in the router over which you want to monitor traffic.

Step 6 

end

Example:

Router(config-if)# end

Exits interface configuration mode and returns to privileged EXEC mode.

Step 7 

show flow interface type number

Example:

Router# show flow interface ethernet 0/0

Displays the status of Flexible NetFlow (enabled or disabled) on the specified interface.

Step 8 

show flow monitor name monitor-name cache format record

Example:

Router# show flow monitor name FLOW_MONITOR-1 cache format record

Displays the status, statistics, and flow data in the cache for the specified flow monitor.

Configuration Examples for Customizing Flexible NetFlow Flow Records and Flow Monitors

This section provides the following configuration examples:

Example: Configuring a Permanent Flow Record Cache with a Limited Number of Possible Flows

Example: Configuring a Customized Flow Record Cache for Monitoring IPv6 Traffic

Example: Configuring Flexible NetFlow for Monitoring MAC and VLAN Statistics

Example: Configuring Flexible NetFlow for Ingress VRF Support

Example: Configuring Flexible NetFlow for Network-Based Application Recognition

Example: Configuring Flexible NetFlow for CTS Fields

Example: Configuring a Permanent Flow Record Cache with a Limited Number of Possible Flows

The following example is designed to monitor the type of service (ToS) field usage on all interfaces in the router. An exporter is not configured because this example is intended to be used to capture additional data for analysis on the router using the show flow monitor command.

This sample starts in global configuration mode:

!
ip cef
!
flow record QOS_RECORD
 description UD: Flow Record to monitor the use of TOS within this router/network
 match interface input
 match interface output
 match ipv4 tos
 collect counter packets
 collect counter bytes
 exit
!
flow monitor QOS_MONITOR
 description UD: Flow Monitor which watches the limited combinations of interface and TOS
 record QOS_RECORD
 cache type permanent
 cache entries 8192   ! 2^5 (combos of interfaces) * 256 (values of TOS)
 exit
!
interface ethernet0/0
 ip flow monitor QOS_MONITOR input
 exit
!
interface ethernet0/1
 ip flow monitor QOS_MONITOR input
 exit
!
interface ethernet0/2
 ip flow monitor QOS_MONITOR input
 exit
!
interface serial2/0
 ip flow monitor QOS_MONITOR input
 exit
!
interface serial2/1
 ip flow monitor QOS_MONITOR input
!

The display from the show flow monitor command shows the current status of the cache.

Router# show flow monitor QOS_MONITOR cache

  Cache type:                         Permanent
  Cache size:                              8192
  Current entries:                            2
  High Watermark:                             2

  Flows added:                                2
  Updates sent         (  1800 secs)          0

Example: Configuring a Customized Flow Record Cache for Monitoring IPv6 Traffic

The following example creates a customized flow record cache for monitoring IPv6 traffic.

This sample starts in global configuration mode:

!
ip cef
ipv6 cef
!
flow record FLOW-RECORD-2
 description Used for basic IPv6 traffic analysis
 match ipv6 destination address
 collect ipv6 protocol
 collect ipv6 source address
 collect transport source-port
 collect transport destination-port
 collect counter bytes
 collect counter packets
 collect timestamp sys-uptime first
 collect timestamp sys-uptime last
!
flow monitor FLOW-MONITOR-2
 description Used for basic IPv6 traffic analysis
 record FLOW-RECORD-2
 cache entries 1000
 statistics packet protocol
 statistics packet size
!
interface Ethernet0/0
 ipv6 address 2001:DB8:2:ABCD::2/48
 ipv6 flow monitor FLOW-MONITOR-2 input
!
interface Ethernet1/0
 ipv6 address 2001:DB8:3:ABCD::1/48
 ipv6 flow monitor FLOW-MONITOR-2 output
!

Example: Configuring Flexible NetFlow for Monitoring MAC and VLAN Statistics

The following example shows how to configure Flexible NetFlow for monitoring MAC and VLAN statistics.

This sample starts in global configuration mode:

!
 flow record LAYER-2-FIELDS-1
 match ipv4 source address
 match ipv4 destination address
 collect datalink dot1q vlan output
 collect datalink mac source address input
 collect datalink mac source address output
 collect datalink mac destination address input
 collect flow direction
 collect counter bytes
 collect counter packets
!
 exit
!
!
flow monitor FLOW-MONITOR-4
 record LAYER-2-FIELDS-1
 exit
!
ip cef
!
interface Ethernet0/0
 ip address 172.16.6.2 255.255.255.0
 ip flow monitor FLOW-MONITOR-1 input
!

Example: Configuring Flexible NetFlow for Ingress VRF Support

The following example configures the collection of the virtual routing and forwarding (VRF) ID from incoming packets on a router by applying an input flow monitor having a flow record that collects the VRF ID as a key field.

This sample starts in global configuration mode:

!
flow record rm_1
match routing vrf input
match ipv4 source address
match ipv4 destination address
collect interface input
collect interface output
collect counter packets
!
flow monitor mm_1
record rm_1
!
interface Serial2/0
ip vrf forwarding green
ip address 172.16.2.2 255.255.255.252
ip flow monitor mm_1 output
!
end

Example: Configuring Flexible NetFlow for Network-Based Application Recognition

The following example uses Network-based Application recognition (NBAR) to create different flows for each application seen between any two IP hosts by applying a flow monitor having a flow record that collects the application name as a key field.

This sample starts in global configuration mode:

!
flow record rm_1
match application name
match ipv4 source address
match ipv4 destination address
collect interface input
collect interface output
collect counter packets
!
flow monitor mm_1
record rm_1
!
interface FastEthernet0/0
ip address 172.16.2.2 255.255.255.0
ip flow monitor mm_1 input
!
end

Example: Configuring Flexible NetFlow for CTS Fields

This following example configures the collection of the Cisco TrustSec (CTS) fields, source Security Group Tag (SGT) and destination Security Group Tag (DGT), in IPv4 traffic.

This sample starts in global configuration mode:

!
flow exporter EXPORTER-1
destination 172.16.10.2
transport udp 90
exit

flow record rm_1
match ipv4 protocol
match ipv4 source address
match ipv4 destination address
match transport source-port
match transport destination-port
match flow direction
match flow cts source group-tag
match flow cts destination group-tag
collect routing source as
collect routing destination as
collect routing source as peer
collect routing destination as peer
collect routing next-hop address ipv4
collect routing next-hop address ipv4 bgp
collect ipv4 source prefix
collect ipv4 source mask
collect ipv4 destination prefix
collect ipv4 destination mask
collect interface input
collect interface output
collect counter bytes
collect counter packets
collect timestamp sys-uptime first
collect timestamp sys-uptime last

!
flow monitor mm_1
record rm_1
exporter EXPORTER-1
!
interface FastEthernet0/0
ip address 172.16.2.2 255.255.255.0
ip flow monitor mm_1 input
!
end

Where to Go Next

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.

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 any of the predefined records for Flexible NetFlow, refer to the "Configuring Cisco IOS Flexible NetFlow with Predefined Records" 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"

Flexible NetFlow Feature Roadmap

"Cisco IOS Flexible NetFlow Features Roadmap"

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"

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"

Configuring Flexible NetFlow using predefined records

"Configuring Cisco IOS Flexible NetFlow with Predefined Records"

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

Table 1 lists the release history for this feature.

Only features that were introduced or modified in Cisco IOS Release 12.2(1) or Cisco IOS Releases 12.2(1) or 12.0(3)S or a later release appear in the table.

Use Cisco Feature Navigator to find information about platform support and software image support. Cisco Feature Navigator enables you to determine which software images support a specific software release, feature set, or platform. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.


Note Table 1 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.


Table 1 Feature Information for Flexible NetFlow 

Feature Name
Releases
Feature Information

Flexible NetFlow

12.2(33)SRC12.2(50)SY 12.4(9)T

Flexible NetFlow is introduced.

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

Information about the Flexible NetFlow feature is included in the following sections:

Prerequisites for Customizing Flexible NetFlow Flow Records and Flow Monitors

Information About Customizing Flexible NetFlow Flow Records and Flow Monitors

How to Customize Flexible NetFlow Flow Records and Flow Monitors

Configuration Examples for Customizing Flexible NetFlow Flow Records and Flow Monitors

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—IPv4 Unicast Flows

12.2(33)SRC12.2(50)SY 12.4(9)T

Enables Flexible NetFlow to monitor IPv4 traffic.

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

Information about the Flexible NetFlow—IPv4 Unicast Flows feature is included in the following sections:

How to Customize Flexible NetFlow Flow Records and Flow Monitors

The following commands were introduced or modified: collect routing, debug flow record, collect ipv4, collect ipv4 destination, collect ipv4 fragmentation, collect ipv4 section, collect ipv4 source, ip flow monitor, match ipv4, match ipv4 destination, match ipv4 fragmentation, match ipv4 section, match ipv4 source, match routing, record, show flow monitor, show flow record.

Flexible NetFlow—Layer 2 Fields

12.2(33)SRE 12.4(22)T

Enables collecting statistics for Layer 2 fields such as MAC addresses and virtual LAN (VLAN) IDs from 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.

Information about the Flexible NetFlow—Layer 2 Fields feature is included in the following sections:

Example: Configuring Flexible NetFlow for Monitoring MAC and VLAN Statistics

The following commands were introduced or modified:

collect datalink dot1q vlan, collect datalink mac, match datalink dot1q vlan, match datalink mac.

Flexible NetFlow—IPv6 Unicast Flows

12.2(33)SRE12.2(50)SY 12.4(20)T

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.

Information about the Flexible NetFlow—IPv6 Unicast Flows feature is included in the following sections:

How to Customize Flexible NetFlow Flow Records and Flow Monitors

Example: Configuring a Customized Flow Record Cache for Monitoring IPv6 Traffic

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.

Flexible NetFlow—Ingress VRF Support

12.2(33)SRE12.2(50)SY 15.0(1)M

Enables collecting the virtual routing and forwarding (VRF) ID from incoming packets on a router by applying an input flow monitor having a flow record that collects the VRF ID as a key or a nonkey field.

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.

Information about the Flexible NetFlow—Ingress VRF Support feature is included in the following section:

How to Customize Flexible NetFlow Flow Records and Flow Monitors

Example: Configuring Flexible NetFlow for Ingress VRF Support

The following commands were introduced or modified: collect routing, match routing, option (Flexible NetFlow), show flow monitor.

Flexible NetFlow—NBAR Application Recognition

15.0(1)M

Network-based Application recognition (NBAR) enables creation of different flows for each application seen between any two IP hosts by applying a flow monitor having a flow record that collects the application name as a key or a nonkey field.

Information about the NBAR Application Recognition feature is included in the following sections:

How to Customize Flexible NetFlow Flow Records and Flow Monitors

Example: Configuring Flexible NetFlow for CTS Fields

The following commands were introduced or modified:

collect application name, match application name, option (Flexible NetFlow), show flow monitor.

TrustSec NetFlow IPv4 SGACL Deny and Drop Export

12.2(50)SY

Enables Flexible NetFlow to collect Cisco Trusted Security (CTS) information in IPv4 traffic.

Information about the TIPv4 Flexible Netflow/v9 for CTS feature is included in the following sections:

How to Customize Flexible NetFlow Flow Records and Flow Monitors

Example: Configuring Flexible NetFlow for CTS Fields

The following commands were introduced or modified: collect flow, match flow, show flow monitor.

TrustSec NetFlow IPv6 SGACL Deny and Drop ExportS

12.2(50)SY

Enables Flexible NetFlow to collect Cisco Trusted Security (CTS) information in IPv6 traffic.

Information about the IPv6 Flexible Netflow/v9 for CTSfeature is included in the following sections:

How to Customize Flexible NetFlow Flow Records and Flow Monitors

Example: Configuring Flexible NetFlow for CTS Fields

The following commands were introduced or modified: collect flow, match flow, show flow monitor.