06-09-2008 07:02 AM - edited 03-05-2019 11:30 PM
How I can use this feature for QoS? is it only some solution or it's just some software? Can anybody help me with this queastion?
06-09-2008 07:08 AM
The best way to learn to use NBAR and QoS is to download and read the SRND for QoS. It can be found here http://www.cisco.com/application/pdf/en/us/guest/netsol/ns432/c649/ccmigration_09186a008049b062.pdf
NBAR uses PDLMs which may or may not be installed already on your router.
http://www.cisco.com/en/US/docs/ios/qos/configuration/guide/nbar_app_recog_mods.html
Some other helpful links-
http://www.cisco.com/en/US/docs/ios/qos/configuration/guide/nbar_mqc.html
http://www.cisco.com/en/US/docs/ios/qos/configuration/guide/nbar_cust_protcl.html
Hope this helps.
06-09-2008 07:12 AM
Hi,
NBAR, is Network Based Application Recognition, and it allows to deep packet inspection (OSI level 7 - application) to determine the content of a specific packet.
ie, it can look at a packet and determine if its FTP traffic, or VoIP traffic, for example.
To use it with QoS you just create a class-map and then use the "match protocol" command, to specify what traffic you want to match on, you then put the class-map into a policy map and apply to the interface.
There are requirements for NBAR to function properly, one of which is CEF, so you'd best be running newer code.
NBAR can also be enabled directly under an interface via the "ip nbar protocol-discovery" command, this allows you to see the different types of traffic passing through the interface.
Hope this helps.
Here is the link to cco for NBAR config guide;
Cheers,
LR
06-09-2008 08:26 AM
NBAR is a protocol which discovers the protocols running on the router and helps to identify protocol applications running on the device/interface.
Enable it using ip nbar protocol-discovery under the intended interface(normally the locallan) to identify the application protocols.
This required cef to be running or enabled on the router for it to pull the statistics from each packet and parse minute details of protocols running & use these to apply QOS for depending on the criticality of the application.
However it cant be used on interfaces with tunneling or encryption put on & on dialer and FE channels.
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