Modular QoS Configuration Guide for Cisco NCS 5000 Series Routers, IOS XR Release 6.3.x

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Updated:: October 14, 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
Strict Policy Queueing	Priority Queuing (PQ) in strict priority mode ensures that one type of traffic is sent, possibly at the expense of all others. For PQ, alow-priority queue can be detrimentally affected, and, in the worst case, never allowed to send its packets if a limited amount of bandwidth is available or the transmission rate of critical traffic is high. Strict PQ allows delay-sensitive data, such as voice, to be de-queued and sent before packets in other queues are de-queued. In releases prior to Release 6.3.1, only one priority level configuration is supported for any of the eight egress class-maps (queues). From this release, eight levels of priority level configurations are supported.	Release 6.3.1	Configuring Modular QoS Congestion Management chapter

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