• PFC Watchdog in SONiC
• High Level Design Document
• Rev 0.1
• Table of Contents
• List of Tables
• Revision
• About this Manual
• Scope
• Definitions/Abbreviation
• Table 2: Abbreviations
• 1 PFC Watchdog Requirements Overview
• 1.1 Overview
• 1.2 Functional Specification
• 1.2.1 PFC storm detection
• 1.2.2 PFC storm mitigation
• 1.2.3 PFC storm restoration
• 2 Modules Design
• 2.1 Config DB
• 2.1.1 PFC WD Table
• 2.2 FLEX_COUNTER DB
• 2.2.1 PFC WD FLEX_COUNTER_GROUP_TABLE entry
• 2.2.2 PFC WD FLEX_COUNTER_TABLE entry for each port
• 2.2.3 PFC WD FLEX_COUNTER_TABLE entry for each lossless queue
• 2.3 COUNTERS DB
• 2.3.1 COUNTERS table
• 2.4 Criteria for storm detection
• 2.5 Action Handlers
• 2.6 Events for Resetting PFC WD
• 2.6.1 Counters Reset
• 2.6.2 Port Going Down
• 2.6.3 Queue Reconfiguration or Removal
• 2.7 CLI
• 3 Flows
• 3.1 General Overview
• 3.2 Reading SAI Counters
• 3.3 Watchdog Orchagent
• 3.4 WD Drop Action
• 3.4.1 Detect Handler
• 3.4.2 Restore Handler
• 3.5 WD Forward Action
• 3.5.1 Detect Handler
• 3.5.2 WD Restore Handler