Modular QoS Configuration Guide for Cisco 8000 Series Routers, IOS XR Release 25.1.x, 25.2.x, 25.3.x

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Updated:: September 16, 2025

New and Changed QoS Features

Table 1. QoS Features Added or Modified
Feature	Description	Changed in Release	Where Documented
HBM enhancement buffer-extended hybrid mode	This feature was introduced.	Release 25.3.1	Buffer-extended hybrid mode
Enhanced PFC pause duration monitoring	This feature was introduced.	Release 25.2.1	View traffic class queue pause duration

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