Syntax: critical [netname ...] [-u [all]] [netname ...]
The database contains a list of net names that will be considered critical by the router. Such nets will be afforded higher priority by the router. The list is maintained by this command. With no options, The entire list or names of critical nets is printed.
With no options, The entire list or names of ignored nets is printed. Otherwise, the arguments consist of net names or the special token -u. Net names given before or without -u will be added to the critical net list (if not already present). Net names given after -u will be removed from the critical net list, if found.
A special case is when the special keyword ``all'' follows -u. In this case, the entire list is cleared. This is not undoable so proceed with caution.