[c-nsp] Needs some help with QOS

[Ivan Pepelnjak]

Exactly true ... That would be my next answer :)

However, the problem is that it's somewhat hard to estimate what the shaping
bandwidth should be in DSL environments (you have the cell tax on top of
PPPoE plus unknown amount of oversubscription in the SP network) if you want
to squeeze as much out of the DSL line as possible.

Best regards
Ivan

> -----Original Message-----
> From: Tim Franklin [mailto:tim at pelican.org] 
> Sent: Tuesday, March 24, 2009 1:57 PM
> To: Ivan Pepelnjak
> Cc: 'John Lange'; 'Cisco NSP'
> Subject: Re: [c-nsp] Needs some help with QOS
> 
> On Tue, March 24, 2009 12:12 pm, Ivan Pepelnjak wrote:
> 
> > What is your upstream connection? If you're using PPPoE, 
> you won't be 
> > able to do any output queuing, as the outbound LAN 
> interface is never 
> > saturated (the bottleneck is experienced by the DSL modem).
> 
> If you know what your upstream bandwidth is, you can wrap a 
> shaper around the queueing policy to provide the 
> back-pressure.  Useful for all sorts of 'ethernet hand-off' 
> type services where the circuit provider has some other 
> device upstream of your router.
> 
> Regards,
> Tim.
> 
> 
>