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DLB again



Hi
As I wrote some time ago I'm trying to simulate a Dual Leaky Bucket (Proposed by A. Elwalid, Bell Laboratories and D. Mitra Lucent Technologies). It is a 3-parameter traffic-policer (and not a shaper) but I think it could be well simulated by 2 TBFs in succession with a particular  parameters' choice (i.e. 1st queue=2nd queue=2nd buffer=1 ). So:
How can I put two TBF in succession?
(I've read the mailing archive but the proposed solutions don't seem to be valid).
Thanks