Ake Hedman wrote:
>> I define the pseudo ground plane
>> in Eagle as a polygon, and set the cost for routing in that layer
>> very high.
>
> How is this done exactly? I have never understood how a top layer with
> lots of copper ground plane around a few traces are done in eagle.

If you want an entire inner layer to be a ground plane (or any other
signal), name the layer $<signal name>.  If you want a plane on one of the
outer layers, or don't want the entire layer to be the plane, then you have
to use a polygon.

In the board editor, draw a polygon in the desired layer and give it the
name of the signal.  There are a few more details which you can see by doing
HELP POLY.


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