Modular QoS Configuration Guide for Cisco NCS 5500 Series Routers, IOS XR Release 7.7.x

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Updated:: July 1, 2022

New and Changed QoS Features

Table 1. QoS Features Added or Modified in IOS XR Release 7.7.x
Feature	Description	Changed in Release	Where Documented
QoS IP DSCP Preservation for SR-TE	With this feature, traffic with IP packets with DSCP marking for priority, flows as intended and there’s no drop in traffic because of incorrect or missing labels.	Release 7.7.1	QoS IP DSCP Preservation for SR-TE
QoS DSCP Preservation for mLDP	For mLDP traffic, the IP DSCP markings are now preserved by default in the ingress policies when the MPLS labels are pushed into the packet.	Release 7.7.1	QoS DSCP Preservation for mLDP

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