> On 4 Mar, 2021, at 8:31 am, Thomas Croghan <[email protected]> wrote:
> 
> So this would be preferable right? <Theoretically unlimited bandwidth> -- 
> <Cake Instance Limiting bandwidth going left to right> -- <Some sort of limit 
> to 100 Mbps> -- <Cake Instance Limiting bandwidth going right to left> -- <10 
> x 25 Mbps Customers>

Yes, putting the Cake instances associated with the backhaul link upstream of 
the link in both directions like that is better for a number of reasons.  You 
can still have the instances managing individual customers on the right-hand 
side, or even further to the right.

If the customer links are physically wider in the upstream direction than is 
made available to the customer, then there's no problem in doing all the 
per-customer work in an aggregated position.  The difference (in the long run) 
between the traffic transmitted by the customer and that released to traverse 
the backhaul is limited to AQM activity on Not-ECT traffic, which will be 
small, unless they start flooding in which case the overload protection will 
kick in and start dropping a lot of packets.  This is also what you'd expect to 
see with a well-behaved policer in the same position.

 - Jonathan Morton
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