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IPv6 Flexible NetFlow Configuration Example

     

    Introduction

    This document provides sample configuration of Flexible NetFlow using IPv6 in Cisco IOS routers.Cisco IOS Flexible NetFlow is a next-generation flow  technology.

     

    NetFlow is a Cisco IOS technology that  provides statistics on packets flowing through a router. NetFlow provides IP operational data from IP networks to support network and security monitoring, network planning and other variety of purposes.

     

    Flexible NetFlow customize the traffic analysis parameters for your specific requirements and with the help of reusable configuration components, it facilitates the creation of more complex configurations for traffic analysis and data export.Flexible NetFlow improves on original NetFlow by providing

    enhanced optimization of the network infrastructure, improves capacity planning  and security detection.

     

    Prerequisite

    The following prerequisite to be met for configuring IPv6 NetFlow:

     

    • The networking device must be configured for IPv6 routing.
    • IPv6 CEF or Distributed IPv6 CEF must be enabled on the routers and on any interfaces on which you want to enable Flexible NetFlow.

    Background

    In this example, router R1 and R2 are connected via FastEthernet interface Fa1/0 and uses OSPFv3 to communicate with each other. The interfaces are configured with IPv6 addresses.

     

    Note: All configuration is tested on Cisco 7200 Series Router running on IOS Version  15.0(1)M Advance IP Services Image.

    Topology Diagram

    IPv6 netflowconfigex.jpeg

    Summary Steps

    In Global Configuration Mode
    1. enable
    2. configure terminal
    3. flow monitor monitor-name
    4. description description
    5. record                
    6. end

     

    In Interface Configuration Mode
    1. ipv6 flow monitor monitor-name {input |output}
    2. end

     

    Configuration

    R1
    R2

    R1#show run

    !

    version 15.0

    !

    hostname R1

    !

    flow monitor TEST

     

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

     

    record netflow ipv6 original-output

     

    Specifies the record for the flow monitor.

     

    !

    ipv6 unicast-routing

    ipv6 cef

    !

    interface Loopback0

    no ip address

    ipv6 address 1111::11/128

    ipv6 ospf 1 area 0

    !

    interface FastEthernet1/0

    no ip address

    duplex auto

    speed auto

    ipv6 address 2020:1:1:1::1/64

    ipv6 ospf 1 area 0

    ipv6 flow monitor TEST output

     

    Activates the flow monitor that you created previously by

    assigning it to the interface to analyze egress traffic.

     

    !

    ipv6 router ospf 1

    router-id 1.1.1.1

    log-adjacency-changes

    !

    end

    R2#show run

    !

    version 15.0

    !

    hostname R2

    !

    flow monitor TEST2

     

    record netflow ipv6 protocol-port

     

    Creates flows based on protocols and ports in the traffic flow data.

     

    !

    ipv6 unicast-routing

    ipv6 cef

    !

    interface Loopback0

    no ip address

    ipv6 address 2222::22/128

    ipv6 ospf 1 area 0

    !

    interface FastEthernet1/0

    no ip address

    duplex auto

    speed auto

    ipv6 address 2020:1:1:1::2/64

    ipv6 ospf 1 area 0

    ipv6 flow monitor TEST2 input

     

    Activates the flow monitor that you created previously by

    assigning it to the interface to analyze egress traffic.

     

    !

    !

    ipv6 router ospf 1

    router-id 2.2.2.2

    log-adjacency-changes

    !

    !

    end

     

    Verification Commands

    show flow monitor

    show flow monitor.jpeg

    show running-config flow monitor <monitor-name>

    show running-config flow monitor.JPG

    show flow monitor <monitor-name> statistics

    show flow monitor statistics.JPG

    show flow record netflow ipv6 protocol-port

    show flow record netflow ipv6 protocol-port.JPG

    show flow monitor <monitor-name> cache

    show flow monitor cache.JPG

    References

    Understanding IPv6 NetFlow

    Flexible Netflow Configuration Guide, Cisco IOS Release 15.0S

    Cisco IOS Flexible NetFlow Command Reference

    Cisco IOS Flexible NetFlow Technology Q&A

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