Netflow v9 for IPv6

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Updated:December 26, 2006

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Netflow v9 for IPv6

Table Of Contents

Netflow v9 for IPv6

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

Configuring the NetFlow v9 for IPv6 Feature: Example

Additional References

Related Documents

Standards

MIBs

RFCs

Technical Assistance

Command Reference

Feature Information for Netflow v9 for IPv6

Netflow v9 for IPv6

First Published: February 27th, 2007

Last Updated: February 27th, 2007

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 in This Module

Your Cisco IOS software release may not support all of the features documented in this module. To reach links to specific feature documentation in this module and to see a list of the releases in which each feature is supported, use the "Feature Information for Netflow v9 for IPv6" section.

Finding Support Information for Platforms and Cisco IOS and Catalyst OS Software Images

Use Cisco Feature Navigator to find information about platform support and Cisco IOS and Catalyst OS 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

•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

•Command Reference

•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

Before you configure the Netflow v9 for IPv6 feature, you should understand the following concepts:

•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

Perform the steps in this required task to configure the Netflow v9 for IPv6 feature.

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.

Cisco-7600#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:

•Configuring the NetFlow v9 for IPv6 Feature: Example

Configuring the NetFlow v9 for IPv6 Feature: Example

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

The following sections provide references related to the Netflow v9 for IPv6 feature.

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, Release12.2SR

Standards

Standard

Title

There are no standards associated with this feature.

—

MIBs

MIB

MIBs Link

There are no MIBs associated with this feature.

To locate and download MIBs for selected platforms, Cisco IOS 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 Technical Support & Documentation website contains thousands of pages of searchable technical content, including links to products, technologies, solutions, technical tips, tools, and technical documentation. Registered Cisco.com users can log in from this page to access even more content.

http://www.cisco.com/techsupport

Command Reference

This feature uses no new or modified commands.

Feature Information for Netflow v9 for IPv6

Table 2 lists the release history for this feature.

Not all commands may be available in your Cisco IOS software release. For release information about a specific command, see the command reference documentation.

Use Cisco Feature Navigator to find information about platform support and software image support. Cisco Feature Navigator enables you to determine which Cisco IOS and Catalyst OS 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 Cisco IOS software release that introduced support for a given feature in a given Cisco IOS software release train. Unless noted otherwise, subsequent releases of that Cisco IOS 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

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.

Any Internet Protocol (IP) addresses used in this document are not intended to be actual addresses. Any examples, command display output, and figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses in illustrative content is unintentional and coincidental.

© 2007 Cisco Systems, Inc. All rights reserved.

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.

	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.

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, Release12.2SR

Standard	Title
There are no standards associated with this feature.	—

MIB	MIBs Link
There are no MIBs associated with this feature.	To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL: http://www.cisco.com/go/mibs

RFC	Title
RFC 3954	Cisco Systems NetFlow Services Export Version 9.

Description	Link
The Cisco Technical Support & Documentation website contains thousands of pages of searchable technical content, including links to products, technologies, solutions, technical tips, tools, and technical documentation. Registered Cisco.com users can log in from this page to access even more content.	http://www.cisco.com/techsupport

Table 2 Feature Information for Netflow v9 for IPv6
Feature Name	Releases	Feature Information
Netflow v9 for IPv6	12.2(33)SRB	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.

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