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You may find that your Cisco Catalyst 3850 seems to have its CBQoS settings properly configured, and that NTA displays a recent Last Received CBQoS date/time, however the Average and Last Polled Interface Utilization shows 0.00% and the counter data is completely missing. This results in a number of blank charts and graphs with "No Data Available" displayed. Despite this, the Class Name fields for CBQoS Post-Policy and Pre-Policy Class Maps are populated.
Cisco IOS Software, IOS-XE Software, Catalyst L3 Switch Software (CAT3K_CAA-UNIVERSALK9-M), Version 03.06.03E RELEASE SOFTWARE (fc3)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2015 by Cisco Systems, Inc.
Compiled Wed 26-Aug-15
Hardware limitation Cisco confirmed and it's only tied to this model. The Class-map will always show 0 bytes for the OID:
|cbQosCMPrePolicyByte64||126.96.36.199.188.8.131.52.184.108.40.206.1.6||Count of bytes befor applying QoS policies for each class|