Z in Routing

KEY Z routing is 45-degree routing, used for RDL and analog designs.

Fixing Opens and Shorts

Opens - the tool normally does not leave any open net.

If a net has special attributes such as skip_route or freeze, reset those attributes and re-run the routing commands (route_zrt_eco or ecoRoute). Shorts:
For shorts against a cell-internal blockage, move the cells if possible, re-run the ECO router with settings that let it detect these shorts, or via TCL create a full blockage over the short area and re-run legalize placement.
Power-to-signal shorts can be cleaned automatically by the ECO router.
Power-to-power, power-to-ground and ground-to-ground shorts cannot be cleaned by the tool.
Clock-to-signal shorts can be cleaned by the ECO router.
Clock-to-clock shorts can technically be cleaned by ECO route, but ECO route is not preferred here.
Simply re-running the router commands can also fix shorts, since the tool may have left them only because it hit its maximum runtime.
In ICC you can call ICV to fix shorts using signoff_autofix_drc.

KEY Reset blocking attributes for opens; for shorts use ECO router, blockages, or ICV - power/ground shorts need manual fixes.