[c-nsp] IP precedence inside of a service policy

[Glen Turner]

On Wed, 2004-08-25 at 04:05, Temkin, David wrote:
> This may sound silly, but if I'm applying the IP precedence inside of a
> service policy but have a default class, how does it get applied.  Let's
> say I have:
> 
> !
> policy-map test
>   class test
>    set ip precedence 5
>   class test1
>    bandwidth 10000
>   class class-default
>    fair-queue
>    random-detect

I too have pondered this. My conclusion is that service policies are not
recursive, so only one "class" clause is executed per packet.

However, you are allowed to have two service policies -- one on input
and one on output. So to re-work your example:

  class-map CS5
   match ip dscp cs5

  policy-map IN
   class TEST
    set ip dscp cs5
   class class-default
    set ip dscp default

  policy-map OUT
   class CS5
    bandwidth 10000
   class class-default
    fair-queue
    random-detect

I'm open to correction, as Cisco's documentation is rather poor, but
this seems to fit the DiffServ QoS model that the Modular QoS is trying
to implement.

-- 
Glen Turner         Tel: (08) 8303 3936 or +61 8 8303 3936
Australian Academic & Research Network   www.aarnet.edu.au