How to fix congestion at routing stage?

Congestion reported by eGR fafter place or CTS is more as, eGR detours less to avoid congestion, it helps finding congestion before hand instead of detouring nets. Fixing congestion after route is usually difficult and it should be addressed by placement stage.

o   Route Effort: Increase the effort level of the detailed router (setRouteMode -detEffort high). The tool will spend more time trying alternative paths or rip-up and reroute techniques.

o   Congestion-Driven Routing:

o   If max route length is given, maybe it can be relaxed if timing is not critical so net can be detoured and fix congestion.

o   If less restrictive NDR can be used? This needs CTS rerun.