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Originally Posted by sheka
The broadcast traffic is still directed to a MAC address.
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Erm, ya FF:FF:FF:FF:FF:FF
Own up which unfortunate bod has that MAC address on their cable modem
(NB under the Cisco policy mapping this wouldn't actually count towards any user's traffic anyway, only unicasts are).
While we're at it who's saying that a policy map is being used on each uBR, and indeed that uBR then not only counts the traffic but then implements the throttling? There are SO many reasons why this would be a bad idea, as well as a PITA to implement if not impossible.
Policy maps exist for static throttling through layer 3/4 means or using NBAR and protocol recognition, not dynamic throttling based on a database of usage and MAC addresses.