Those queues can and should be correctly managed and configured. Both in 
terms of queue size and/or use of /RFC 2697/ 
<http://www.ietf.org/rfc/rfc2697.txt>
or /RFC 2698/ <https://tools.ietf.org/rfc/rfc2698.txt>, depend on each 
operator and what they are selling (SLA) ....

On 21/03/2013 15:53, Michael Richardson wrote:
> This is for the page where we list places that you may have bufferbloat
> and be unable to see it.  I think that there is a place in the wiki, but
> I have to locate it, and I started writing this offline.
>
> Many owners of (managed) fiber sell NNI to Access Port "LAN Extension"
> services. Typically there is a 1GB/s ethernet NNI in the data center,
> and a VLAN is assigned to travel to a 10Mb/s or 100Mb/s port at each site.
>
> The consumer of this service is usually (Boutique) ISPs, but also larger
> enterprises.   Without oversubscribing the NNI, the provider of the
> fiber may have oversubscribed the service, and this can cause queues to
> develop inside of this layer-2 network.  Even without oversubscription
> in the provider network, instantaenous bursts can sometimes cause
> significant jitter and buffer consumption.
>
> These buffers may have nothing to do with the consumer's
> traffic. Addition of buffers here reduces the drop probability therefore
> appears to the provider to be a good idea.
>
>
>
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