Modular QoS Configuration Guide for Cisco NCS 5500 Series Routers, IOS XR Release 25.1.x, 25.2.x, 25.3.x, 25.4.x

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Updated:: December 17, 2025

New and Changed QoS Features

Table 1. QoS Features Added or Modified
Feature	Description	Changed in Release	Where Documented
Ingress QoS policer scale enhancement using statistics resource reassignment	This feature was introduced.	Release 25.4.1	Ingress QoS policer scale enhancement using statistics resource reassignment
Configurable fair adaptive drop thresholds	This feature was introduced.	Release 25.3.1	Fair Adaptive Drop Thresholds

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