China Mobile Huawei Huawei Telefonica Huawei IGP normally computes the shortest paths in a network for packet forwarding, without taking the traffic demands and available bandwidth into consideration. When there is a link degradation or partial link failure in a network which causes throughput reduction, or the volume of specific traffic flows increase dramatically, unexpected congestion may happen if only the shortest paths are used for IP forwarding. Conventional centralized Traffic Engineering (TE) focuses on long- term bandwidth and routes planning based on traffic demands, which can not react to the congestions in networks timely. This document describes a distributed path computation and load balancing mechanism named Elastic Bandwidth-aware Routing (EBR), which can alleviate congestions timely before TE finishes the global optimization. It allows IGP-enabled nodes which face congestion to distribute traffic among the shortest paths and load-balancing alternate paths through Segment Routing (SR) strict path, with weights determined based on the bandwidth utilization and available bandwidth of these paths. It provides an efficient, accurate and backward compatible approach for dynamic link congestion avoidance.