[rbak-nsp] qos queuing with L2TP tunnels

[Richard Clayton]

Ian

It was the aggregate on the circuit towards the lac I wanted to pwfq, I
remember when I tried to do this on Cisco I could never match traffic that
was l2tp encapsulated, we ended up l2tp tunnel switching the traffic to
another lns and shaping the whole tunnel, one of my colleagues has a working
redback pwfq policy but the bandwidth shaping values don't exactly match
reality, the difference appears to be the overhead of the l2tp etc.  How
does the redback Qos inside l2tp, does it match before encapsulation or is
it doing some type of dpi.

Thanks
Rick

On 10 January 2011 10:22, Ian Calderbank <ian at calderbankconsulting.co.uk>wrote:

> ------------------------------
>
> Message: 5
> Date: Sat, 8 Jan 2011 10:03:28 +0000
> From: Richard Clayton <sledge121 at gmail.com>
> To: redback-nsp at puck.nether.net
> Subject: [rbak-nsp] qos queuing with L2TP tunnels
> Message-ID:
>        <AANLkTinqFF4Bj9GKMV_jkujRruqYv41MC9bPABzaQQym at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> > Is it possible to perform outbound qos queuing on traffic that is
> encapsulated within L2TP.
>
> yes
>
> >If it is possible then how is it done as I assume queuing happens after
> L2TP encapsulation.
>
>
> Just apply pwfq policy to the subscriber if you want per-subscriber
> queuing.
> Be careful that the line card / EPPA that has the circuit for the
> subscriber
> and that which has the circuit for the l2tp tunnel are the same otherwise
> PWFQ won't work . I see you are discussing this with david already.
>
> If you want to apply qos to the aggregate traffic as well / instead, you
> can
> also apply pwfq to the egress circuit to the lac. If you try to do _both_
> (subscriber and aggregate), be careful. There's no H-Qos for l2tp lns.
>
> ta
> Ian
>
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