Cisco Catalyst 9400 User Manual

8. Question: I can't configure queue-based egress policy with match protocol protocol-name command.
Answer: Only shape and set DSCP are supported in a policy with NBAR2 based classifiers. Common
practice is to set DSCP on ingress and perform shaping on egress based on DSCP.
9. Question: I don’t have NBAR2 attached to any interface but I still see that NBAR2 is activated.
Answer: If you have any class-map with match protocol protocol-name, NBAR will be globally
activated on the switch but no traffic will be subjected to NBAR classification. This is an expected
behavior and it does not consume any resources.
10. Question: I see some traffic under the default QOS queue. Why?
Answer: For each new flow, it takes a few packets to classify it and install the result in the hardware.
During this time, the classification would be 'un-known' and traffic will fall under the default queue.
Additional References for Application Visibility and Control
Related Documents
Document TitleRelated Topic
Command Reference (Catalyst 9400 Series
Switches)
For complete syntax and usage information for the
commands used in this chapter.
Feature History for Application Visibility and Control in a Wired
Network
This table provides release and related information for features explained in this module.
These features are available on all releases subsequent to the one they were introduced in, unless noted
otherwise.
Feature InformationFeatureRelease
AVC is a critical part of Cisco’s efforts to evolve
its Branch and Campus solutions from being strictly
packet and connection based to being
application-aware and application-intelligent.
Application Visibility
and Control in a Wired
Network
Cisco IOS XE Everest 16.6.1
Support for defining QoS classes and policies based
on Network-Based Application Recognition
(NBAR) attributes instead of specific protocols,
was made available, with a few limitations. Only
business-relevance and traffic-class are the
supported NBAR attributes.
Wired Application
Visibility and Control
(Wired AVC)
Attribute-based QoS
(EasyQoS)
Cisco IOS XE Fuji 16.8.1a
Support for DNS flow record was introduced. DNS
flow record uses the DNS Domain-Name as the
collect field for defining the flow record.
DNS flow recordCisco IOS XE Gibraltar
16.12.1
System Management Configuration Guide, Cisco IOS XE Bengaluru 17.4.x (Catalyst 9400 Switches)
219
Configuring Application Visibility and Control in a Wired Network
Additional References for Application Visibility and Control

Cisco Catalyst 9400 Specifications

General

Brand	Cisco
Model	Catalyst 9400
Category	Switch
Language	English