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Netflow v9 for IPv6

Table Of Contents

Netflow v9 for IPv6

Finding Feature Information

Contents

Prerequisites for Netflow v9 for IPv6

Information About Netflow v9 for IPv6

NetFlow and NDE on the PFC

NetFlow Export Format Version 9

How to Configure Netflow v9 for IPv6

Examples

Configuration Examples for Configuring Netflow v9 for IPv6

Example: Configuring the NetFlow v9 for IPv6 Feature

Additional References

Related Documents

Standards

MIBs

RFCs

Technical Assistance

Feature Information for Netflow v9 for IPv6


Netflow v9 for IPv6


First Published: February 27, 2007
Last Updated: July 30, 2010

This module contains information about and instructions for configuring NetFlow and NetFlow Data Export (NDE) for capturing and exporting data from IP version 6 (IPv6) traffic flows using the NetFlow version 9 (v9) export format.

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 Netflow v9 for IPv6" 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

Finding Feature Information

Prerequisites for Netflow v9 for IPv6

Information About Netflow v9 for IPv6

How to Configure Netflow v9 for IPv6

Configuration Examples for Configuring Netflow v9 for IPv6

Additional References

Feature Information for Netflow v9 for IPv6

Prerequisites for Netflow v9 for IPv6

Your router must be running Cisco IOS release 12.2(33)SRB or later to configure the Netflow v9 for IPv6 feature.

Information About Netflow v9 for IPv6

NetFlow and NDE on the PFC

NetFlow Export Format Version 9

NetFlow and NDE on the PFC

The NetFlow cache on the PFC captures statistics for flows routed in hardware.

The PFC uses one of these flow masks to create NetFlow entries:

source-only—The cache contains one entry for each source IP address. All flows from a given source IP address use this entry.

destination—The cache contains one entry for each destination IP address. All flows to a given destination IP address use this entry.

destination-source—The cache contains one entry for each source and destination IP address pair. All flows between the same source and destination IP addresses use this entry.

destination-source-interface—Adds the source VLAN SNMP ifIndex to the information in the destination-source flow mask.

full—A separate cache entry is created for each IP flow. A full entry includes the source IP address, destination IP address, protocol, and protocol interfaces.

full-interface—Adds the source VLAN SNMP ifIndex to the information in the full flow mask.

See the "Configuring NetFlow and NDE" chapter of the Cisco 7600 Series Cisco IOS Software Configuration Guide, Release 12.2SR, for detailed information on NetFlow flow masks and flow records.

NetFlow Export Format Version 9

For all NetFlow export versions, the NetFlow export datagram consists of a header and a sequence of flow records. The header contains information such as sequence number, record count, and system uptime. The flow record contains flow information, such as IP addresses, ports, and routing information.

NetFlow version 9 export format is the newest NetFlow export format. The distinguishing feature of the NetFlow version 9 export format is that it is template based. Templates make the record format extensible. NetFlow version 9 export format allows future enhancements to NetFlow without requiring concurrent changes to the basic flow-record format.

The NetFlow version 9 export record format is different from the traditional NetFlow fixed format export record. In NetFlow version 9, a template describes the NetFlow data, and the flow set contains the actual data. This arrangement allows for flexible export.

The use of templates with the NetFlow version 9 export format provides several other key benefits:

You can export almost any information from a router or switch, including Layer 2 through 7 information, routing information, IP version 6 (IPv6), IP version 4 (IPv4), multicast, and Multiprotocol Label Switching (MPLS) information. This new information allows new applications for export data and new views of network behavior.

Third-party business partners who produce applications that provide NetFlow collector or display services for NetFlow are not required to recompile their applications each time a new NetFlow export field is added. Instead, they can use an external data file that documents the known template formats.

New features can be added to NetFlow more quickly, without breaking current implementations.

NetFlow is "future-proofed" against new or developing protocols, because the version 9 export format can be adapted to provide support for them and for other non-NetFlow-based approaches to data collection.

The NetFlow version 9 export packet header format is shown in Table 1.

Table 1 NetFlow Version 9 Export Packet Header Field Names and Descriptions 

Bytes
Field Name
Description

0-1

Version

The version of NetFlow records exported in this packet; for version 9, this value is 0x0009.

2-3

Count

Number of FlowSet records (both template and data) contained within this packet.

4-7

System Uptime

Time in milliseconds since this device was first booted.

8-11

UNIX Seconds

Seconds since 0000 Coordinated Universal Time (UTC) 1970.

12-15

Sequence Number

Incremental sequence counter of all export packets sent by this export device; this value is cumulative, and it can be used to find out whether any export packets have been missed.

This is a change from the NetFlow version 5 and version 8 headers, where this number represented "total flows."

16-19

Source ID

The Source ID field is a 32-bit value that is used to guarantee uniqueness for each flow exported from a particular device. (The Source ID field is the equivalent of the engine type and engine ID fields found in the NetFlow version 5 and version 8 headers.) The format of this field is vendor specific. In Cisco's implementation, the first two bytes are reserved for future expansion and are always zero. Byte 3 provides uniqueness with respect to the routing engine on the exporting device. Byte 4 provides uniqueness with respect to the particular line card or Versatile Interface Processor on the exporting device. Collector devices should use the combination of the source IP address and the Source ID field to associate an incoming NetFlow export packet with a unique instance of NetFlow on a particular device.


Figure 1 shows a typical example of exporting data using the NetFlow version 9 export format.

Figure 1 NetFlow Version 9 Export Format Packet Example

Additional information about the NetFlow export format version 9 and the export format architecture is available in the NetFlow version 9 Flow-Record Format document.

How to Configure Netflow v9 for IPv6

SUMMARY STEPS

1. enable

2. configure terminal

3. ipv6 unicast-routing

4. mls flow {ip | ipv6} {destination | destination-source | full | interface-destination-source | interface-full | source}

5. mls nde sender

6. ip flow-export version 9

7. ip flow-export destination {ip-address | hostname} udp-port

8. interface type number

9. ipv6 address ip-address/mask

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 

ipv6 unicast-routing

Example:

Router(config)# ipv6 unicast-routing

Enables the forwarding of IPv6 unicast datagrams.

Step 4 

mls flow {ip | ipv6} {destination | destination-source | full | interface-destination-source | interface-full | source}

Example:

Router(config)# mls flow ipv6 interface-full

Specifies the NetFlow flow mask for IPv6 traffic.

Step 5 

mls nde sender

Example:

Route(config)# mls nde sender

Enables NDE globally on the router.

Note NDE does not start exporting data until you specify a destination for the exported traffic. The destination for exported traffic is specified in Step 7.

Step 6 

ip flow-export version 9

Example:

Router(config)# ip flow-export version 9

Configures NDE to use the NetFlow version 9 export format.

Step 7 

ip flow-export destination {ip-address | hostname} udp-port

Example:

Router(config)# ip flow-export destination 172.16.10.2 88

Specifies the IP address or the hostname of the NetFlow collector and the UDP port on which the NetFlow collector is listening.

Step 8 

interface type number

Example:

Router(config)# interface fastethernet 1/1

Specifies the interface that you want to enable NetFlow on and enters interface configuration mode.

Step 9 

ipv6 address ip-address/mask

Example:

Router(config-if)# ipv6 address 2001:0DB8:AB::2/64

Configure an IPv6 address on the interface.

Examples

The following output of the show mls nde command verifies that NDE is enabled on the router.

Router# show mls nde


NetFlow Data Export enabled

Exporting flows to 10.30.30.2 (12345) 172.16.10.2 (88)

Exporting flows from 10.4.9.149 (58970)

Version: 9

Layer2 flow creation is disabled

Layer2 flow export is disabled

Include Filter not configured

Exclude Filter not configured

Total NetFlow Data Export Packets are:

0 packets, 0 no packets, 0 records

Total NetFlow Data Export Send Errors:

IPWRITE_NO_FIB = 0

IPWRITE_ADJ_FAILED = 0

IPWRITE_PROCESS = 0

IPWRITE_ENQUEUE_FAILED = 0

IPWRITE_IPC_FAILED = 0

IPWRITE_OUTPUT_FAILED = 0

IPWRITE_MTU_FAILED = 0

IPWRITE_ENCAPFIX_FAILED = 0

NetFlow Aggregation Disabled

Configuration Examples for Configuring Netflow v9 for IPv6

This section contains the following configuration example:

Example: Configuring the NetFlow v9 for IPv6 Feature

Example: Configuring the NetFlow v9 for IPv6 Feature

The following example shows how to configure the router for NetFlow and NDE for IPv6 traffic using NetFlow export format version 9.

ipv6 unicast-routing
mls flow ipv6 interface-full 
mls nde sender 
ip flow-export version 9 
ip flow-export destination 172.16.10.2 88
interface FastEthernet1/1 
ipv6 address 2001:0DB8::1/64

Additional References

Related Documents

Related Topic
Document Title

Platform-independent NetFlow commands, complete command syntax, command mode, defaults, command history, usage guidelines, and examples.

Cisco IOS NetFlow Command Reference

Command reference for Cisco 7600 series routers

Cisco 7600 Series Cisco IOS Command Reference


Standards

Standard
Title

There are no standards associated with this feature.


MIBs

MIB
MIBs Link

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 website provides extensive online resources, including documentation and tools for troubleshooting and resolving technical issues with Cisco products and technologies.

To receive security and technical information about your products, you can subscribe to various services, such as the Product Alert Tool (accessed from Field Notices), the Cisco Technical Services Newsletter, and Really Simple Syndication (RSS) Feeds.

Access to most tools on the Cisco Support website requires a Cisco.com user ID and password.

http://www.cisco.com/techsupport


Feature Information for Netflow v9 for IPv6

Table 2 lists the features in this module and provides links to specific configuration information.

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 2 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 2 Feature Information for Netflow v9 for IPv6 

Feature Name
Releases
Feature Information

Netflow v9 for IPv6

12.2(33)SRB
15.0(1)S

The Netflow v9 for IPv6 feature enables the export of NetFlow flow information for IPv6 traffic.

In 12.2(33)SRB, support for this feature was introduced on the Cisco 7600 series routers.