Congestion-Aware Adaptive Flow Table Switching for ECMP

This document defines a congestion-aware adaptive flow table switching mechanism for Equal-Cost Multi-Path (ECMP) routing. The mechanism periodically assesses the congestion state of egress ports and progressively adjusts flow table mappings based on quantified congestion levels. This addresses the port congestion issues that occur in traditional ECMP load balancing when traffic patterns change suddenly or multicast traffic is present, while maintaining packet ordering within flows.