NBAR does not perfom traffic shaping and prioritization. It is the job of the QoS policy applied to the interface.
- NBAR can be used to discover existing traffic flowing through an interface, using the "ip nbar protocol-discovery" interface command and the "show ip nbar protocol-discovery" exec command.
Based on the protocol and traffic statistics discovered by NBAR, you can classify your traffic into classes based on the requirements of your business and you can configure a QoS policy to tell the router how to treat the different classes of traffic.
- You actually use NBAR within class-maps when classifying traffic with the "match protocol" command.
- When you use the Auto QoS feature, it uses NBAR as well for protocol discovery, and it generates the class-maps and the policy-map based on Cisco best practices for QoS.
So NBAR can be used as useful QoS tool within the DiffServ model
Those are fine answers. I applied it to my 3825 router,and when I perform the "show ip nbar protocol-discovery" exec command, I see alot of data about all the protocols/classes of traffic running thru our router.
How is this similar to and then in turn different from Netflow?
"This feature requires the classification of packets in a variety of ways: IP source and destination addresses, Layer 4 protocol and port numbers, incoming interface, MAC address, IP Precedence, DSCP value, Layer 2 information (such as Frame-Relay DE bits or Ethernet 802.1p bits), and NBAR (Network-Based Application Recognition)information."
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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