[cisco-nas] Support for "percent" directive in per-session QoS

[Ben Steele]

You specify your bandwidth via a radius av-pair, say for example you 
have a 512kb downstream ADSL service landing on your LNS you would have 
a line like:

cisco-avpair = "lcp:interface-config#1=bandwidth 435"     (435kb 
allowing for a 15% dsl overhead)
cisco-avpair = "lcp:interface-config#2=service-policy output SHAPED-QOS"

Then using the shape average percent command the LNS would shape the 
user to that speed, you can then apply your actual QoS policy under 
that, like so:

policy-map SHAPED-QOS
 class class-default
  shape average percent 100 50 ms
  service-policy QOS

This would apply the policy "QOS" to the shaped interface, I hope that 
is what you were after, and yes it does work quite well with 
priority(LLQ), the most important thing is to shape it to the correct 
speed, when the link is being saturated and you do a "sh policy-map int 
xx" you want to see it reporting that it is being shaped.

Cheers

Ben


David Freedman wrote:
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> I believe this is possible reading the documentation at
> http://www.cisco.com/en/US/products/ps6566/products_feature_guide09186a0080610dad.html
>
> there is mention of it, but the question I want to ask is :
>
> how does it know what the available bandwidth is such to be able to
> calculate the percentage?
>
> I mean, with a standard CBWFQ attached to an interface, it derrives this
> from the interface bandwidth, but for vaccess QoS we are required to
> nest the CBWFQ under a shaper, so does the percentage directive
> use the shape average rate of this shaper?
>
> Does anybody use this directive (interested for those whom use it for a
> priority queue) and does it work?
>
> Many thanks,
>
>
> - --
> David Freedman
> Group Network Engineering
> Claranet Limited
> http://www.clara.net
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