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Integrated Traffic Monitoring Configuring ITM and Top Traffic Using the CLI

the observation point after 15 seconds by default. When traffic flow entries expire, they are ready to be

exported to the data collector. By default, active traffic flow entries are forcibly expired in 30 minutes.

Also by default, traffic flows become inactive and expire after 15 seconds of inactivity. Use the following

commands to set the time that traffic flows are stored before expiration:

(config)#ip flow cache timeout active <minutes>

(config)#ip flow cache timeout inactive <seconds>

Active traffic flows are cached for 1 to 60 minutes, and inactive traffic flows are stored for 10 to

600 seconds, depending on preference. The no form of the command resets the expiration time to the

default (active is 30 minutes, inactive is 15 seconds). The following is the syntax of the no form of the

command:

(config)#no ip flow cache timeout active <minutes>

(config)#no ip flow cache timeout inactive <seconds>

Traffic Flow Export

Specifying a destination for traffic flow exportation allows the data collected to be sent to an external data

collector for analysis. Traffic flow data can be sent to two different destinations or port configurations.

When specifying the destination of traffic flow exports, several parameters can be included.

VRF locations can be specified by adding a VRF <name> parameter to the command. VRFs allow a single

physical router to be partitioned into two or more virtual routers, each with its own route table, routing

protocols, and IP addresses. Traffic being forwarded to one router instance is prevented from spilling over

into any other router instances. The VRF parameter in traffic monitoring allows for the designation of a

particular VRF as the destination of the traffic flow data.

The destination parameter for the traffic flow data must be specified, and includes the IP address of the

forwarding location, as well as the UDP port number. If using the VRF option, the IP address and port

number will correspond to the chosen VRF.

A source interface can also be specified. Specifying a source sets a source interface to send the data export

packets. If using a VRF destination, the source must be on the same VRF as the destination or it will be

ignored. If the source is ignored, the routing table will determine the source interface. The source

parameter includes the specification of the interface through the <interface> parameter. Specify an

interface in the format <interface type [slot/port | slot/port.sub-interface id | interface id | interface

id.sub-interface id]>. For example, for a T1 interface, use t1 0/1; for an Ethernet sub-interface, use eth

0/1.1; for a PPP interface, use ppp 1; and for an ATM sub-interface, use atm 1.1. Type ? at the source

parameter for a complete list of valid interfaces.

For more information on VRFs, refer to Configuring Multi-VRF available on the AOS

Documentation CD shipped with your product, or available on the Web at

www.adtran.com.

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ADTRAN FNID Technical Information Seite 29