[j-nsp] Conditional advertisting to an upstream

[Paul Goyette]

> Which implies to me that the policy is only applied to potentially 
> contributing routes i.e. in your example below the policy would never 
> "see" the 0.0.0.0/0 since it's not a contributer. The wording in the 
> later docs support this.
> 
> Is this not in fact the case?

This is correct.

Only potential contributors are evaluated by the policy
to determine if the generate route should in fact be
generated.