Published On: August 5ᵗʰ, 2019 19:09

Flexible Netflow Configuration Guide, Cisco IOS Release 15SY

TrustSec NetFlow IPv6 SGACL Deny and Drop Export

The TrustSec NetFlow IPv6 SGACL Deny and Drop Export feature enables Flexible NetFlow to collect Cisco Trusted Security (CTS) information in IPv6 traffic.

Finding Feature Information

Your software release may not support all the features documented in this module. For the latest caveats and feature information, see Bug Search Tool and 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 table.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/​go/​cfn. An account on Cisco.com is not required.

Information About TrustSec NetFlow IPv6 SGACL Deny and Drop Export

TrustSec NetFlow IPv6 SGACL Deny and Drop Export Overview

A Security Group Access Control List (SGACL) is used to filter untrusted packets. The TrustSec NetFlow IPv6 SGACL Deny and Drop Export feature enables Flexible NetFlow to collect Cisco Trusted Security (CTS) information in IPv6 traffic.

How to Configure TrustSec NetFlow IPv6 SGACL Deny and Drop Export

Configuring a Customized Flow Record

Perform this task to configure a customized flow record.

Customized flow records are used to analyze traffic data for a specific purpose. A customized flow record must have at least one match criterion for use as the key field and typically has at least one collect criterion for use as a nonkey field.

There are hundreds of possible permutations of customized flow records. This task shows the steps that are used to create one of the possible permutations. Modify the steps in this task as appropriate to create a customized flow record for your requirements.

SUMMARY STEPS

1. enable

2. configure terminal

3. flow record record-name

4. description description

5. match { | ipv6} {destination | source} address

6. Repeat Step 5 as required to configure additional key fields for the record.

7.

8. Repeat the above step as required to configure additional nonkey fields for the record.

9. end

10. show flow record record-name

11. show running-config flow record record-name


DETAILED STEPS
  Command or Action Purpose
Step 1 enable


Example: 
Device> enable
 

Enables privileged EXEC mode.

  • Enter your password if prompted.

 
Step 2 configure terminal


Example: 
Device# configure terminal
 

Enters global configuration mode.

 
Step 3 flow record record-name


Example: 
Device(config)# flow record FLOW-RECORD-1
 

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

  • This command also allows you to modify an existing flow record.

 
Step 4 description description


Example: 
Device(config-flow-record)# description Used for basic traffic analysis
 

ipv4 (Optional) Creates a description for the flow record.

 
Step 5 match { | ipv6} {destination | source} address


Example: 
Device(config-flow-record)# match ipv4 destination address
 

Configures a key field for the flow record.

Note   

This example configures the IPv4 destination address as a key field for the record. For information about the other key fields available for the match ipv4 command, and the other match commands that are available to configure key fields, refer to the Cisco IOS Flexible NetFlow Command Reference .
 
Step 6 Repeat Step 5 as required to configure additional key fields for the record.  

—

 
Step 7

Example:
 

Configures the input interface as a nonkey field for the record.

Note   

This example configures the input interface as a nonkey field for the record. For information on the other collect commands that are available to configure nonkey fields, refer to the Cisco IOS Flexible NetFlow Command Reference.
 
Step 8 Repeat the above step as required to configure additional nonkey fields for the record.  

—

 
Step 9 end


Example: 
Device(config-flow-record)# end
 

Exits Flexible NetFlow flow record configuration mode and returns to privileged EXEC mode.

 
Step 10 show flow record record-name


Example: 
Device# show flow record FLOW_RECORD-1
 

(Optional) Displays the current status of the specified flow record.

 
Step 11 show running-config flow record record-name


Example: 
Device# show running-config flow record FLOW_RECORD-1
 

(Optional) Displays the configuration of the specified flow record.

 

Creating a Customized Flow Monitor

Perform this required task to create a customized flow monitor.

Each flow monitor has a separate cache assigned to it. Each flow monitor requires a record to define the contents and layout of its cache entries. These record formats can be one of the predefined formats or a user-defined format. An advanced user can create a customized format using the flow record command.

Before You Begin

If you want to use a customized record instead of using one of the Flexible NetFlow predefined records, you must create the customized record before you can perform this task. If you want to add a flow exporter to the flow monitor for data export, you must create the exporter before you can complete this task.


Note

You must use the no ip flow monitor command to remove a flow monitor from all of the interfaces to which you have applied it before you can modify the parameters for the record command on the flow monitor. For information about the ip flow monitor command, refer to the Cisco IOS Flexible NetFlow Command Reference.
SUMMARY STEPS

1. enable

2. configure terminal

3. flow monitor monitor-name

4. description description

5. record {record-name | netflow-original | netflow {ipv4 | ipv6} record [peer]}

6. cache {entries number | timeout {active | inactive | update} seconds | {immediate | normal | permanent}}

7. Repeat Step 6 as required to finish modifying the cache parameters for this flow monitor.

8. statistics packet protocol

9. statistics packet size

10. exporter exporter-name

11. end

12. show flow monitor [[name] monitor-name [cache [format {csv | record | table}]] [statistics]]

13. show running-config flow monitor monitor-name


DETAILED STEPS
  Command or Action Purpose
Step 1 enable


Example: 
> enable
 

Enables privileged EXEC mode.

  • Enter your password if prompted.

 
Step 2 configure terminal


Example: 
# configure terminal
 

Enters global configuration mode.

 
Step 3 flow monitor monitor-name


Example: 
(config)# flow monitor FLOW-MONITOR-1
 

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

  • This command also allows you to modify an existing flow monitor.

 
Step 4 description description


Example: 
(config-flow-monitor)# description Used for basic ipv4 traffic analysis
 

(Optional) Creates a description for the flow monitor.

 
Step 5 record {record-name | netflow-original | netflow {ipv4 | ipv6} record [peer]}


Example: 
(config-flow-monitor)# record FLOW-RECORD-1
 

Specifies the record for the flow monitor.

 
Step 6 cache {entries number | timeout {active | inactive | update} seconds | {immediate | normal | permanent}}


Example:  

(Optional) Modifies the flow monitor cache parameters such as timeout values, number of cache entries, and the cache type.

The values for the keywords associated with the timeout keyword have no effect when the cache type is set to immediate.

 
Step 7 Repeat Step 6 as required to finish modifying the cache parameters for this flow monitor.  

—

 
Step 8 statistics packet protocol


Example: 
(config-flow-monitor)# statistics packet protocol
 

(Optional) Enables the collection of protocol distribution statistics for Flexible NetFlow monitors.

 
Step 9 statistics packet size


Example: 
(config-flow-monitor)# statistics packet size
 

(Optional) Enables the collection of size distribution statistics for Flexible NetFlow monitors.

 
Step 10 exporter exporter-name


Example: 
(config-flow-monitor)# exporter EXPORTER-1
 

(Optional) Specifies the name of an exporter that was created previously.

 
Step 11 end


Example: 
(config-flow-monitor)# end
 

Exits Flexible NetFlow flow monitor configuration mode and returns to privileged EXEC mode.

 
Step 12 show flow monitor [[name] monitor-name [cache [format {csv | record | table}]] [statistics]]


Example: 
# show flow monitor FLOW-MONITOR-2 cache
 

(Optional) Displays the status and statistics for a Flexible NetFlow flow monitor.

 
Step 13 show running-config flow monitor monitor-name


Example: 
# show running-config flow monitor FLOW_MONITOR-1
 

(Optional) Displays the configuration of the specified flow monitor.

 

Applying a Flow Monitor to an Interface

Before it can be activated, a flow monitor must be applied to at least one interface. Perform this required task to activate a flow monitor.

SUMMARY STEPS

1. enable

2. configure terminal

3. interface type number

4. {ip | ipv6} flow monitor monitor-name {input | output}

5. Repeat Steps 3 and 4 to activate a flow monitor on any other interfaces in the device over which you want to monitor traffic.

6. end

7. show flow interface type number

8. show flow monitor name monitor-name cache format record


DETAILED STEPS
  Command or Action Purpose
Step 1 enable


Example: 
Device> enable
 

Enables privileged EXEC mode.

  • Enter your password if prompted.

 
Step 2 configure terminal


Example: 
Device# configure terminal
 

Enters global configuration mode.

 
Step 3 interface type number


Example: 
Device(config)# interface GigabitEthernet 0/0/0
 

Specifies an interface and enters interface configuration mode.

 
Step 4 {ip | ipv6} flow monitor monitor-name {input | output}

Example: 
Device(config-if)# ip flow monitor FLOW-MONITOR-1 input
 

Activates a flow monitor that was created previously by assigning it to the interface to analyze traffic.

 
Step 5 Repeat Steps 3 and 4 to activate a flow monitor on any other interfaces in the device over which you want to monitor traffic.  

—

 
Step 6 end


Example: 
Device(config-if)# end
 

Exits interface configuration mode and returns to privileged EXEC mode.

 
Step 7 show flow interface type number


Example: 
Device# show flow interface GigabitEthernet 0/0/0
 

Displays the status of Flexible NetFlow (enabled or disabled) on the specified interface.

 
Step 8 show flow monitor name monitor-name cache format record


Example: 
Device# show flow monitor name FLOW_MONITOR-1 cache format record
 

Displays the status, statistics, and flow data in the cache for the specified flow monitor.

 

Configuration Examples for TrustSec NetFlow IPv6 SGACL Deny and Drop Export

Example: Configuring Flexible NetFlow for CTS Fields in IPv6 traffic

This following example configures the collection of the Cisco TrustSec (CTS) fields, source Security Group Tag (SGT) and destination Security Group Tag (DGT), in IPv6 traffic.

This sample starts in global configuration mode:

!
flow exporter EXPORTER-1
destination 172.16.10.2
transport udp 90
exit
flow record rm_1
match ipv6 protocol
match ipv6 source address
match ipv6 destination address
match transport source-port
match transport destination-port
match flow direction
match flow cts source group-tag
match flow cts destination group-tag
collect routing source as
collect routing destination as
collect routing source as peer
collect routing destination as peer
collect routing next-hop address ipv6
collect routing next-hop address ipv6 bgp
collect ipv6 source prefix
collect ipv6 source mask
collect ipv6 destination prefix
collect ipv6 destination mask
collect interface input
collect interface output
collect counter bytes
collect counter packets
collect timestamp sys-uptime first
collect timestamp sys-uptime last
!
flow monitor mm_1
record rm_1
exporter EXPORTER-1
!
interface FastEthernet0/0
ip address 172.16.2.2 255.255.255.0
ip flow monitor mm_1 input
!
end

Additional References for TrustSec NetFlow IPv6 SGACL Deny and Drop Export

Related Documents

Related Topic

Document Title

Cisco IOS commands

Cisco IOS Master Commands List, All Releases

Flexible NetFlow conceptual and configuration information

Flexible NetFlow Configuration Guide

Configuration commands for Flexible NetFlow

Cisco IOS Flexible NetFlow Command Reference

Standards

Standard

Title

None.

--

MIBs

MIB

MIBs Link

None

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 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/​cisco/​web/​support/​index.html

Feature Information for TrustSec NetFlow IPv6 SGACL Deny and Drop Export

The following table provides release information about the feature or features described in this module. This table 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.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/​go/​cfn. An account on Cisco.com is not required.
Table 1 Feature Information for TrustSec NetFlow IPv6 SGACL Deny and Drop Export

Feature Name

Releases

Feature Information

TrustSec NetFlow IPv6 SGACL Deny and Drop ExportS

12.2(50)SY

15.0(1)SY

15.0(1)SY1

Enables Flexible NetFlow to collect Cisco Trusted Security (CTS) information in IPv6 traffic.

The following commands were introduced or modified: collect flow, match flow, show flow monitor.