Shape peak and police pir

From: ccie2be (ccie2be@nyc.rr.com)
Date: Thu Dec 16 2004 - 16:15:32 GMT-3


Hi guys,

I've been going through the 2nd Edition of Cisco QOS and overall it's a very
good book. It fills some of the gaps that weren't covered in the first
edition and is as you'd expect more up-to-date.

I just finished going over shaping and policing for the umpteenth time, but
I'm still a bit fuzzy on the above commands.

I understand the syntax and mechanics of the above commands, but I don't get
the point of these commands.

What I mean is why use shape peak instead of shape average with different
values? With shape peak, (bc + be) are aent every Tc. If bc + be = X, why
not just use shape average X instead? What's the difference?

For police pir, I have similar question: what's the practical benefit of
having 2 rates? Can't the same result be achieved, for example, by an ISP, by
charging one rate for packets (or bytes) that conform and and higher rate for
packets that exceed?

Thanks, Tim



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