How to set a NET in DEF file as FIXED?

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My boss wants to prevent routing tools from modifying some particular nets. So he asked to "mark those nets to something like i.e. +FIXED, so it won't be changed by the router. "

Could anyone tell me if it works? If so, what exactly should I do to the DEF file? An example will be really appreciated it
 

it can be done, but whether the tool will respect it or not, that is a different question. fixed is probably not the attribute you want, +routed should work for you. give it a try.

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the intent you are trying to pass on to the tools might be easier to do using commands like set_dont_route, just a tip.
 
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