Does NetFlow work on layer 2 interface?

Does NetFlow work on layer 2 interface?

The Flexible NetFlow – Layer 2 Fields feature enables collecting statistics for Layer 2 fields such as MAC addresses and virtual LAN (VLAN) IDs from traffic. Perform this task to configure a customized flow record. Customized flow records are used to analyze traffic data for a specific purpose.

What OSI layer is NetFlow?

Netflow and sFlow Simplistically Layers 3 and 4 are used by NetFlow to look at IP flows of traffic only.

What is NetFlow timeout?

Set active timeout to 1 minute: “ip flow-cache timeout active” is the time interval NetFlow records are exported for long lived flows (e.g. large FTP transfer). 1 minute is recommended and configuration is in minutes in IOS and seconds in MLS and NX-OS.

What is the difference between NetFlow and Flexible NetFlow?

Traditional NetFlow tracked all information in one single cache. Flexible NetFlow provides a new functionality where it can collect security information in one cache, traffic analysis and billing in separate caches. Flexible NetFlow also has the ability to export flow information to multiple collectors.

How does NetFlow work Cisco?

NetFlow is a one-way technology, so when the server responds to the initial client request, the process works in reverse and creates a new flow record. Using a NetFlow monitoring solution can allow you to monitor and analyze these flow records more efficiently and effectively for traffic within the network.

How do I enable NetFlow on my Cisco router?

Enable NetFlow Run the following command. Replace AuvikCollectorIP with the IP address of your Auvik collector and AuvikPort with one of the following ports: 2055, 2056, 4432, 4739, 6343, 9995 or 9996. Now enable NetFlow collection on the interface(s) from which you want to capture information.

What protocol does NetFlow use?

User Datagram Protocol (UDP)
NetFlow records are traditionally exported using User Datagram Protocol (UDP) and collected using a NetFlow collector. The IP address of the NetFlow collector and the destination UDP port must be configured on the sending router.

Is NetFlow bidirectional?

Traditionally, NetFlow is a unidirectional technology. As an example, when host A sends traffic to host B, this will create a single flow.

How much bandwidth does NetFlow use?

This depends on the number of conversations that are being summarized by NetFlow. According to Cisco, v9 and v5 exporters will use about 1.5% to 3% of the monitored interfaces bandwidth. The traffic will be proportional to the number of active conversations and the interface bandwidth.

What is the difference between NetFlow and SNMP?

SNMP datagrams are continuously sent across the network in real-time (i.e. every second) as responses to SNMP queries, while the exporting of NetFlow records depends on active/inactive timers. It may take up to 30 minutes to export a flow when NetFlow is used.

What is the primary difference between NetFlow and SNMP?

SNMP packets are continuously sent across the network in real-time (every second for example) as responses to master station queries. On the other hand, the exporting of NetFlow records depends on active/inactive timers. This means it can take up to 30 minutes to export a flow when NetFlow is being used.

How does NetFlow collect data?

How to Collect NetFlow Data

1. Flow exporter: a network device (a router or firewall) in charge of obtaining flow data and exports it to a flow collector.
2. Flow collector: a device that collects the exported flow data.
3. Flow analyzer: an application that examines and analyses the flow data collected by the flow collector.

Is NetFlow TCP or UDP?

The standard or most common UDP port used by NetFlow is UDP port 2055, but other ports, such as 9555, 9995, 9025, and 9026, can also be used. UDP port 4739 is the default port used by IPFIX.

Does NetFlow use TCP or UDP?

Is NetFlow unidirectional?

How is NetFlow collected?

These records are exported from the router and collected using a NetFlow collector. The NetFlow collector then processes the data, performs the traffic analysis, and presents the findings in a user-friendly format. NetFlow collectors can take the form of hardware-based collectors (probes) or software-based collectors.

What is the difference between NetFlow and syslog?

It is possible to use both Syslogs and NetFlow. Syslog does not have any overhead but NetFlow may place a load on CPU when utilized. Also, the volume of NetFlow data can be quite large.

Is NetFlow real time?

In terms of tools specific to NetFlow reporting, ETS includes: NetFlow Real-Time Tool—Shows data in real time, so you can see the origination and destination of traffic, as well as types of traffic traveling through your network.