Alert dependencies

Hi,

is it possible to define dependencies for alerts?
I saw following problem. If Router X is down all Services behind that
router will be notified. That's very annoying and I want to prevent
that. Notifying me, that Router X is down is enough.

Same for host connections. If a host is down I just want to get the host
down alert. Furthermore is there a feature like "don't notifiy me if
host/Service was red in <period>"?

I did not found suitable options for that so far.
I hope you can help me out.

Thanks and best regards
Marvin Stark
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