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Flexible NetFlow Configuration Guide, Cisco IOS XE Fuji 16.8.x

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Book Title

Flexible NetFlow Configuration Guide, Cisco IOS XE Fuji 16.8.x

Chapter Title

Flexible NetFlow Output Features on Data Export

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Updated:
March 29, 2018

Chapter: Flexible NetFlow Output Features on Data Export

Flexible NetFlow Output Features on Data Export

This feature enables sending export packets using Quality of Service (QoS) and encryption.

Finding Feature Information

Your software release may not support all the features documented in this module. For the latest caveats and feature information, see Bug Search Tool and 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.

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 Output Features on Data Export

  • The networking device must be running a Cisco 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.

Information About Flexible NetFlow Output Features on Data Export

Flow Exporters

Flow exporters are created as separate components in a router’s configuration. Exporters are assigned to flow monitors to export the data from the flow monitor cache to a remote system such as a NetFlow collector. Flow monitors can support more than one exporter. Each exporter can be customized to meet the requirements of the flow monitor or monitors in which it is used and the NetFlow collector systems to which it is exporting data.

Benefits of Flexible NetFlow Flow Exporters

Flexible NetFlow allows you to configure many different flow exporters, depending on your requirements. Some of the benefits of Flexible NetFlow flow exporters are as follows:

  • Using flow exporters, you can create an exporter for every type of traffic that you want to analyze so that you can send each type of traffic to a different NetFlow collector. Original NetFlow sends the data in a cache for all of the analyzed traffic to a maximum of two export destinations.

  • Flow exporters support up to ten exporters per flow monitor. Original NetFlow is limited to only two export destinations per cache.

  • Flow exporters can use both TCP and UDP for export.

  • Depending on your release, flow exporters can use class of service (CoS) in the packets that are sent to export destinations to help ensure that the packets are given the correct priority throughout the network. Original NetFlow exporters do not use CoS in the packets that are sent to export destinations.

  • Depending on your release, flow exporter traffic can be encrypted.

How to Configure Flexible NetFlow Output Features on Data Export

Restrictions

Each flow exporter supports only one destination. If you want to export the data to multiple destinations, you must configure multiple flow exporters and assign them to the flow monitor. Flow exporters are added to flow monitors to enable data export from the flow monitor cache.


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 .

Configuring the Flow Exporter

Perform this required task to configure the flow exporter.


Note

Each flow exporter supports only one destination.

You can export to a destination using either an IPv4 or IPv6 address.

SUMMARY STEPS

    1.    enable

    2.    configure terminal

    3.    flow exporter exporter-name

    4.    description description

    5.    destination {ip-address | hostname} [vrf vrf-name]

    6.    dscp dscp

    7.    source interface-type interface-number

    8.    output-features

    9.    template data timeout seconds

    10.    transport udp udp-port

    11.    ttl seconds

    12.    end

    13.    show flow exporter exporter-name

    14.    show running-config flow exporter exporter-name


DETAILED STEPS
     Command or ActionPurpose
    Step 1 enable


    Example: 
    Device> enable
     

    Enables privileged EXEC mode.

    • Enter your password if prompted.

     
    Step 2 configure terminal


    Example: 
    Device# configure terminal
     

    Enters global configuration mode.

     
    Step 3 flow exporter exporter-name


    Example: 
    Device(config)# flow exporter EXPORTER-1
     

    Creates the flow exporter and enters Flexible NetFlow flow exporter configuration mode.

    • This command also allows you to modify an existing flow exporter.

     
    Step 4 description description


    Example: 
    Device(config-flow-exporter)# description Exports to the datacenter
     

    (Optional) Configures a description to the exporter that will appear in the configuration and the display of the show flow exporter command.

     
    Step 5 destination {ip-address | hostname} [vrf vrf-name]


    Example: 
    Device(config-flow-exporter)# destination 172.16.10.2
     

    Specifies the IP address or hostname of the destination system for the exporter.

    Note   

    You can export to a destination using either an IPv4 or IPv6 address.

     
    Step 6 dscp dscp


    Example: 
    Device(config-flow-exporter)# dscp 63
     

    (Optional) Configures differentiated services code point (DSCP) parameters for datagrams sent by the exporter.

    • The range for the dscp argument is from 0 to 63. Default: 0.

     
    Step 7 source interface-type interface-number


    Example: 
    Device(config-flow-exporter)# source ethernet 0/0
     

    (Optional) Specifies the local interface from which the exporter will use the IP address as the source IP address for exported datagrams.

     
    Step 8 output-features


    Example: 
    Device(config-flow-exporter)# output-features
     

    (Optional) Enables sending export packets using quality of service (QoS) and encryption.

     
    Step 9 template data timeout seconds


    Example: 
    Device(config-flow-exporter)# template data timeout 120
     

    (Optional) Configures resending of templates based on a timeout.

    • The range for the seconds argument is 1 to 86400 (86400 seconds = 24 hours).

     
    Step 10 transport udp udp-port


    Example: 
    Device(config-flow-exporter)# transport udp 650
     

    Specifies the UDP port on which the destination system is listening for exported datagrams.

    • The range for the udp-port argument is from 1 to 65536.

     
    Step 11 ttl seconds


    Example: 
    Device(config-flow-exporter)# ttl 15
     

    (Optional) Configures the time-to-live (TTL) value for datagrams sent by the exporter.

    • The range for the seconds argument is from 1 to 255.

     
    Step 12 end


    Example: 
    Device(config-flow-exporter)# end
     

    Exits flow exporter configuration mode and returns to privileged EXEC mode.

     
    Step 13 show flow exporter exporter-name


    Example: 
    Device# show flow exporter FLOW_EXPORTER-1
     

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

     
    Step 14 show running-config flow exporter exporter-name


    Example: 
    Device# show running-config flow exporter FLOW_EXPORTER-1
     

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

     

    Displaying the Current Status of a Flow Exporter

    To display the current status of a flow exporter, perform the following optional task.

    SUMMARY STEPS

      1.    enable

      2.    show flow exporter [export-ids {netflow-v5| netflow-v9} | [name] exporter-name [statistics | templates]]


    DETAILED STEPS
      Step 1   enable

      The enable command enters privileged EXEC mode (enter the password if prompted).



      Example:
      Device> enable
Device#
      Step 2   show flow exporter [export-ids {netflow-v5| netflow-v9} | [name] exporter-name [statistics | templates]]

      The show flow exportercommand shows the current status of the flow exporter that you specify.



      Example:
      Device# show flow exporter EXPORTER-1
Flow Exporter EXPORTER-1:
  Description:              Exports to the datacenter
  Export protocol:          NetFlow Version 9
  Transport Configuration:
    Destination IP address: 172.16.10.2
    Source IP address:      172.16.6.2
    Source Interface:       GigabitEthernet1/0/0
    Transport Protocol:     UDP
    Destination Port:       650
    Source Port:            55864
    DSCP:                   0x3F
    TTL:                    15
    Output Features:        Used
  Options Configuration:
    exporter-stats (timeout 120 seconds)
    interface-table (timeout 120 seconds)
    sampler-table (timeout 120 seconds)

      Verifying the Flow Exporter Configuration

      To verify the configuration commands that you entered, perform the following optional task.

      SUMMARY STEPS

        1.    enable

        2.    show running-config flow exporter exporter-name


      DETAILED STEPS
        Step 1   enable

        The enable command enters privileged EXEC mode (enter the password if prompted).



        Example:
        Device> enable
Device#
        Step 2   show running-config flow exporter exporter-name

        The show running-config flow exporter command shows the configuration commands of the flow exporter that you specify.



        Example:
        Device# show running-config flow exporter EXPORTER-1
Building configuration...
Current configuration:
!
flow exporter EXPORTER-1
 description Exports to the datacenter
 destination 172.16.10.2
 source GigabitEthernet1/0/0
 dscp 63
 ttl 15
 transport udp 650
 template data timeout 120
 option exporter-stats timeout 120
 option interface-table timeout 120
 option sampler-table timeout 120
!
end

        Configuring and Enabling Flexible NetFlow with Data Export

        You must create a flow monitor to configure the types of traffic for which you want to export the cache data. You must enable the flow monitor by applying it to at least one interface to start exporting data. To configure and enable Flexible NetFlow with data export, perform this 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 to 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.    record {record-name | netflow-original | netflow {ipv4 | ipv6 record [peer] }]

          5.    exporter exporter-name

          6.    exit

          7.    interface type number

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

          9.    end

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


        DETAILED STEPS
           Command or ActionPurpose
          Step 1 enable


          Example:
          Device> enable
           

          Enables privileged EXEC mode.

          • Enter your password if prompted.

           
          Step 2 configure terminal


          Example:
          Device# configure terminal
           

          Enters global configuration mode.

           
          Step 3 flow monitor monitor-name


          Example:
          Device(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 record {record-name | netflow-original | netflow {ipv4 | ipv6 record [peer] }]


          Example:
          Device(config-flow-monitor)# record netflow ipv4 original-input
           

          Specifies the record for the flow monitor.

           
          Step 5 exporter exporter-name


          Example:
          Device(config-flow-monitor)# exporter EXPORTER-1
           

          Specifies the name of an exporter that you created previously.

           
          Step 6 exit


          Example:
          Device(config-flow-monitor)# exit
           

          Exits Flexible NetFlow flow monitor configuration mode and returns to global configuration mode.

           
          Step 7 interface type number


          Example:
          Device(config)# interface GigabitEthernet 0/0/0
           

          Specifies an interface and enters interface configuration mode.

           
          Step 8 {ip | ipv6} flow monitor monitor-name {input | output}

          Example:
          Device(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.

           
          Step 9 end


          Example:
          Device(config-if)# end
           

          Exits interface configuration mode and returns to privileged EXEC mode.

           
          Step 10 show flow monitor [[name] monitor-name [cache [format {csv | record | table}]][statistics]]


          Example:
          Device# show flow monitor FLOW-MONITOR-2 cache
           

          (Optional) Displays the status and statistics for a Flexible NetFlow flow monitor. This will verify data export is enabled for the flow monitor cache.

           

          Configuration Examples for Flexible NetFlow Output Features on Data Export

          Example: Configuring Sending Export Packets Using QoS

          The following example shows how to enable QoS on Flexible Netflow export packets.


          Note

          The Flexible NetFlow export packets are transmitted using QoS on Ethernet interface 0/1 (the interface on which the destination is reachable) to the destination host (IP address 10.0.1.2).

          This sample starts in global configuration mode: 

          !
flow record FLOW-RECORD-1
 match ipv4 source address
 collect counter packets
!
flow exporter FLOW-EXPORTER-1
 destination 10.0.1.2
 output-features
 dscp 18
!
flow monitor FLOW-MONITOR-1
 record FLOW-RECORD-1
 exporter FLOW-EXPORTER-1
 cache entries 1024
!
ip cef
!
class-map match-any COS3
!
policy-map PH_LABS_FRL_64k_16k_16k_8k_8k
 class COS3
  bandwidth percent 2
  random-detect dscp-based
  random-detect exponential-weighting-constant 1
  random-detect dscp 18 200 300 10
!
interface Ethernet 0/0
 ip address 10.0.0.1 255.255.255.0
 ip flow monitor FLOW-MONITOR-1 input
!
interface Ethernet 0/1
 ip address 10.0.1.1 255.255.255.0
 service-policy output PH_LABS_FRL_64k_16k_16k_8k_8k
!

          The following display output shows that the flow monitor is exporting data using output feature support that enables the exported data to use QoS: 

          Device# show flow monitor FLOW-MONITOR-1
Flow Exporter FLOW-EXPORTER-1:
  Description:              User defined
  Tranport Configuration:
    Destination IP address: 10.0.1.2
    Source IP address:      10.0.0.1
    Transport Protocol:     UDP
    Destination Port:       9995
    Source Port:            56750
    DSCP:                   0x12
    TTL:                    255
    Output Features:        Used

          Additional References

          Related Documents

          Related Topic

          Document Title

          Cisco IOS commands

          Cisco IOS Master Command List, All Releases

          Flexible NetFlow conceptual information and configuration tasks

          Flexible NetFlow Configuration Guide

          Flexible NetFlow commands

          Cisco IOS Flexible NetFlow Command Reference

          Standards/RFCs

          Standard

          Title

          No new or modified standards/RFCs are supported by this feature.

          —

          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

          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—Output Features on Data Export

          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 1 Feature Information for Flexible NetFlow—Output Features on Data Export

          Feature Name

          Releases

          Feature Information

          Flexible NetFlow—Output Features on Data Export

          12.4(20)T

          Cisco IOS XE Release 3.1S

          Enables sending export packets using QoS and encryption.

          The following command was introduced: output-features.

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