This guide provides comprehensive instructions for configuring and managing QoS features on Cisco 8000 Series Routers using the MQC framework. It details essential techniques for traffic classification, marking, and congestion management, alongside advanced mechanisms like PFC and VOQ. Additionally, the guide covers monitoring strategies and specialized deployment scenarios to ensure optimized bandwidth allocation and lossless traffic delivery.
YANG Data Models for QoS Features
Explains automating QoS configuration using YANG models with XPath support and Cisco YANG Data Models Navigator.
Modular QoS Command-line Interface
Introduces the MQC framework, detailing its core components—class-maps, policy-maps, and service-policies. It outlines the structural attributes and operational benefits of using a modular approach for consistent and scalable traffic management across network platforms.
Traffic Management with VOQs
Introduces the VOQ queuing architecture and its role in preventing head-of-line blocking. It covers key features, operational benefits, hardware limitations, and the end-to-end workflow for managing traffic congestion and bandwidth allocation.
Classify Packets to Identify Specific Traffic
Details the processes and techniques for sorting network traffic into specific categories based on predefined criteria to implement QoS policies. It covers classification stages, hardware systems like TCAM, and the impact of DiffServ tunneling modes on traffic handling.
Packet Marking for Priority Differentiation
Introduces QoS packet marking methods for differentiating traffic across IP, MPLS, GRE, SRv6, VXLAN, and Layer 2 interfaces. It covers marking behavior, configuration workflows, benefits, and platform limitations.
QoS Policies for Link Bundles
Details QoS policy behavior on link bundles, including usage guidelines, restrictions, absolute-value policing and shaping, and configuration procedures for applying policies to bundled Ethernet interfaces.
Congestion Management
Defines how QoS manages congestion by placing traffic into queues and applying scheduling, sharing remaining bandwidth, shaping, and policing rules. Covers strict-priority queuing, egress shaping, and ingress policing to help control delay, bandwidth use, and excess traffic.
Congestion Avoidance
Details congestion avoidance mechanisms that manage queue buildup and packet drops. It covers queuing modes, tail drop, dual queue limits, fair VOQ, RED, ECN, and VOQ watchdog configuration.
Congestion Monitoring and Optimization
Provides an overview of congestion monitoring and optimization tools, including VOQ counter sharing, traffic class queue high water mark monitoring, and VOQ eviction tracking to HBM.
Priority Flow Control
Introduces PFC concepts, modes, thresholds, and configuration workflows. It covers buffer-internal, buffer-extended, and hybrid modes, ECN behavior, HBM congestion detection, and interface-level PFC configuration.
Priority Flow Control Watchdog and Monitoring Metrics
Outlines PFC watchdog and monitoring capabilities, including watchdog stages, interval configuration, global statistics counters, traffic class queue pause duration, and verification commands.
QoS Deployment across Network Scenarios
Outlines how QoS is applied in different deployment scenarios by combining classification, remarking, queuing, and policy propagation methods. Helps you choose suitable approaches for VPWS traffic, BGP-based classification, PWHE handling, and BVI two-pass processing.