Modular QoS Configuration Guide for Cisco NCS 5500 Series Routers, IOS XR Release 6.3.x

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Updated:: May 11, 2020

New and Changed QoS Features

Table 1. QoS Features Added or Modified in IOS XR Release 6.3.x
Feature	Description	Changed in Release	Where Documented
Hierarchical Modular QoS (H-QoS)	H-QoS is a QoS model that enables you to specify QoS behavior at multiple levels of hierarchy.	Release 6.3.1	Configuring Hierarchical Modular QoS chapter
Conditional Marking of MPLS Experimental bits for L3VPN traffic	This features allows the L3VPN traffic packets to be marked for differential treatment.	Release 6.3.2	Configuring Modular QoS Service Packet Classification chapter

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