View CBQoS data in NTA

Class-Based Quality of Service (CBQoS) is an SNMP-based, proprietary Cisco technology available on selected Cisco devices that gives you the ability to prioritize and manage traffic on your network. Using policy maps, also known as policies, the different types of traffic on your network are categorized, and then given a priority. Based on assigned priorities, only specified amounts of selected traffic types are allowed through designated, CBQoS-enabled devices.

For example, you could define a policy map in which only 5% of the total traffic over a selected interface may be attributed to YouTube.

CBQoS policies can be simple or include nested policies.

Nested policies are traffic policies applied to a class of an already existing policy. They allow you to set rules for a class-specified type of incoming or outgoing traffic on an interface, thus enabling you to build up a complex approach to different traffic data. Nested policies simplify your job if you need to modify a policy. You just modify the policy and your changes are automatically applied on all devices using this policy.

For more information about configuring class maps for your CBQoS-enabled network devices, search CBQoS at www.cisco.com.

NTAdoes not currently provide a CBQoS configuration capability, but any node managed by NPM can be polled for CBQoS information. If SNMP polls of the MIB for monitored devices are unsuccessful for CBQoS OIDs, CBQoS widgets are automatically hidden because they are empty. For more information about enabling CBQoS polling for monitored devices, see Flow sources and CBQoS polling.

For CBQoS-enabled Cisco devices on your network, NTA can provide immediate insight into the effect of your currently enacted policy maps. The following CBQoS widgets are available for inclusion on NetFlow Interface Details views, NPM Interface Details views, and CBQoS Details views:

CBQoS drops

If it is included on a NetFlow Interface Details view, the CBQoS Drops widget provides both a graph and a table reporting each of the defined classes and corresponding amounts of traffic that are filtered out or dropped as a result of policy maps currently enacted on the viewed interface.

If it is included on the CBQoS Details view, the CBQoS Drops widget provides both a graph and a table reporting the amount of traffic corresponding to the selected CBQoS policy class that is filtered out or dropped as a result of policy maps currently enacted on the viewed interface.

CBQoS policy details

If it is included on a NetFlow Interface Details view, the CBQoS Policy Details widget provides a table with graphic representations of traffic corresponding to defined classes that has passed over the viewed interface in both the hour and the 24 hours prior to the currently viewed time period. In the header, you can also see whether the policy is applied to incoming packets or to packets leaving the selected interface.

If you have defined nested policies for your interface, you can see a hierarchical tree of classes and policies in this widget. Next to each class, you can see the corresponding traffic in the last hour and last day. For traffic data which do not belong to any defined class, NTA automatically creates a class-default class which displays the remaining traffic.

 

If it is included on the CBQoS Details view, the CBQoS Policy Details widget displays the amount of traffic corresponding to the selected CBQoS policy class that has passed over the viewed interface in both the hour and the 24 hours prior to the currently viewed time period.

CBQoS post-policy class map

On a NetFlow Interface Details view, the CBQoS Post-Policy Class Map widget provides a graph and a table detailing the average and the most recently polled amount of traffic corresponding to defined classes passing over the viewed interface as a result of the application of policy maps.

If it is included on the CBQoS Details view, the CBQoS Post-Policy Class Map widget provides both a graph and a table detailing both the average and the most recently polled amount of traffic corresponding to the selected CBQoS policy class passing through the viewed interface resulting from the application of policy maps on the viewed interface.

CBQoS pre-policy class map

If it is included on a NetFlow Interface Details view, the CBQoS Pre-Policy Class Map widget provides both a graph and a table detailing both the average and the most recently polled amount of traffic corresponding to defined classes passing through the viewed interface prior to the application of any policy maps.

If it is included on the CBQoS Details view, the CBQoS Pre-Policy Class Map widget provides both a graph and a table detailing both the average and the most recently polled amount of traffic corresponding to the selected CBQoS policy class passing through the viewed interface prior to the application of any policy maps.

Because there are different formulas for calculating bitrate in loading CBQoS widgets and in generating reports, there is a case in which the numbers on 24 hour views do no correlate. When the device from which the data is being collected has been a CBQoS source node for less than 24 hours, the CBQoS Policy Details widget will show a different number compared to the comparable CBQoS report.