Introduction
Cisco IOS netflow provide network administrators with information concerning IP flows within their data networks such as network traffic accounting, usage-based network billing, network planning, security, Denial of Service monitoring capabilities, and network monitoring. It provides valuable information and exported NetFlow data can be used for a variety of purposes like network management and planning, enterprise accounting, and Internet Service Provider (ISP) billing, data warehousing, combating Denial of Service (DoS) attacks, and data mining for marketing purpose. Net-flow for IPv6 provides basic funcationality of net-flow without affecting the IPv4 net-flow performance. This document provides summary steps on how to configure the ipv6 netflow on Cisco IOS.
Note: The below configuration steps are tested in 12.4 IOS release. To configure IPv6 NetFlow in IOS 12.4(20)T and above refer to
IPv6 Flexible Netflow Configuration Example
How to enable Ipv6 netflow
Summary Steps:
In Configuration mode:
1. ipv6 flow-export version 9
This command enables the exporting of information in NetFlow cache entries.
2. ipv6 flow-export destination ip-address udp-port
This command enable the exporting of information in NetFlow cache entries to a specific address or port.
3. ipv6 flow-export template {refresh-rate packet-refresh-rate | timeout timeout-value}
Configuring this command in the global configuration mode, enable the exporting of information in NetFlow cache entries,
For example:
ipv6 flow-export template refresh-rate 100 means NetFlow cache is refreshed after 100 packets are collected.
In otherwords, the refresh-rate specifies the number of export packets that are sent before the options and flow templates are resent. The value ranges from 1 to 600. and the default value is 20.
ipv6 flow-export template timeout-rate 60 means the flow and options is resent after every 60 minutes
The timeout-rate specifies the interval (in minutes) that the router waits after sending the templates (flow and options) before sending them again. The value ranges from 1 to 3600 and the default value is 30.
4. ipv6 flow-export template options {export-stats | refresh-rate packet-refresh-rate | timeout timeout-value}
This command configures templates for IPv6 cache exports.
Configuring this command enables the export-stats, refresh-rate and timeout-rate keywords for configuring Version 9 export options.
In Interface mode:
- ipv6 flow {ingress | egress}
This command enables accounting of IPv6 packets arriving on an interface configured for 6PE
Configuring ipv6 flow ingress enables IPv6 flow capture on incoming packets.
Configuring ipv6 flow egress enables IPv6 flow capture on outgoing packets.
Managing NetFlow for IPv6 Statistics
The following show commands can be used to display the cache content and cache statistics
- show ipv6 flow cache
This command displays the cache content. Sample output is shown as below:
- show ipv6 flow export.
This command displays the export statistics.Sample output is shown below.
