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.
Stages of Priority Flow Control configuration
Understand the key stages in configuring Priority Flow Control (PFC) on Cisco 8000 routers.
Priority Flow Control
A link-layer congestion management mechanism that pauses only the affected CoS instead of the entire link.
buffer-internal mode
Details buffer-internal mode for PFC, including pause-threshold, headroom, and ECN threshold configuration in the line card profile, along with best practices and reload requirements.
Configurable ECN threshold and marking probability values
Defines configurable ECN threshold and marking probability values as a PFC congestion-optimization mechanism that activates before pause thresholds to provide early probabilistic congestion feedback and prevent pause propagation.
buffer-extended mode
Details buffer-extended mode for PFC, including pause-threshold configuration, interface-level ECN and queue limits, long-haul peer recommendations, and threshold configuration guidelines.
Configure PFC on interfaces
Provides instructions for enabling PFC on interfaces, including class-based pause behavior, policy requirements, interface configuration, and verification of PFC operation.
High Bandwidth Memory congestion detection
Get detailed insights into congestion on the High Bandwidth Memory (HBM), such as the devices on which congestion has occurred, the timestamps, and when the device returned to its normal state.
Global pause frames for High Bandwidth Memory congestion
Explains global pause frames for HBM congestion, including congestion response behavior, configuration recommendations, and procedures for protecting traffic during HBM resource pressure.
buffer-extended hybrid mode
Introduces buffer-extended hybrid mode for PFC, including threshold behavior, default and user-specified configuration options, supported traffic classes, and operational requirements for line card profiles.