IPv6 Flexible NetFlow Configuration Example

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Jun 26, 2012 5:33 AM
Jun 26th, 2012

1. 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.

2. 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.

3. 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.

4. Topology Diagram

IPv6 netflowconfigex.jpeg

5. 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

6. 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

7. 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

8. 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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