Modular QoS Configuration Guide for Cisco 8000 Series Routers, IOS XR Release 7.3.x

New and Changed QoS Features

Table 1. QoS Features Added or Modified in IOS XR Release 7.3.x
Feature	Description	Changed in Release	Where Documented
Equitable Traffic Flow Using Fair VOQ	Configuring this feature ensures that ingress traffic from various source ports on every network slice of an NPU is assigned a unique virtual output queue (VOQ) for every source port and destination port pair.	Release 7.3.3	Equitable Traffic Flow Using Fair VOQ
Improve ACL Scaling Using Peering QoS	This feature merges the functions of QoS and security access control lists (ACLs). This combination enables using the ACL filter with the Object Group ACL, which provides a vastly improved ACL scale due to much lower TCAM usage.	Release 7.3.2	Improve ACL Scaling Using Peering QoS
QoS Policy Inheritance	The functionality is based on an inheritance model, where you create and apply a QoS policy to a main interface. The subinterfaces that are attached to the main interface automatically inherit the policy.	Release 7.3.15	QoS Policy Inheritance
Priority Flow Control Support on Cisco 8800 36x400 GbE QSFP56-DD Line Cards (88-LC0-36FH-M)	These line cards support the Priority Flow Control feature.	Release 7.3.15	Priority Flow Control Overview
QoS Behavior for Generic Routing (GRE) Tunnels	With the introduction of support for GRE encapsulation and decapsulation tunnel interfaces, there are some important updates to QoS behavior for GRE tunnels during encapsulation and decapsulation.	Release 7.3.1	Default Marking and Packet Marking

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